What Is the Difference of Molybdenum Wire and Tungsten Wire in Applications?

Molybdenum (Mo) wire and tungsten (W) wire are indispensable materials in numerous industries due to their exceptional physical and chemical properties. While they share some similarities as refractory metals, their distinct characteristics make them suitable for different applications. 

Applications of Molybdenum Wire

Aerospace Industry:

Mo wire is extensively used in the aerospace industry due to its high strength-to-weight ratio, excellent thermal stability, and resistance to creep at elevated temperatures. It is used in critical components such as aircraft and missile parts, where reliable performance under extreme conditions is essential. Additionally, Mo wire is utilized in the production of heat shields and other thermal management components.

Electronics and Semiconductors:

The electronics industry benefits significantly from Mo wire, particularly in semiconductor manufacturing. Its low thermal expansion coefficient and high electrical conductivity make it ideal for applications like gate electrodes, wiring in integrated circuits, and contact points. Molybdenum's ability to withstand high temperatures without degradation ensures reliability in electronic devices.

Medical Applications:

In the medical field, Mo wire is used in the production of X-ray tubes and various medical instruments. Its high melting point and excellent thermal conductivity make it suitable for generating the necessary heat in X-ray applications. Mo wire is also used in surgical instruments and devices that require biocompatibility and corrosion resistance.

Chemical Processing:

Mo wire’s corrosion resistance makes it valuable in chemical processing environments. It is used in equipment and components exposed to corrosive substances, ensuring longevity and reliability.

Applications of Tungsten Wire

Lighting Industry:

W wire is renowned for its use in the lighting industry, particularly in the production of incandescent light bulb filaments. Tungsten's extremely high melting point (3422°C) and excellent thermal conductivity make it ideal for converting electrical energy into light efficiently. It is also used in halogen lamps and other high-temperature lighting applications.

Electronic Devices:

In electronic devices, W wire is utilized in cathode ray tubes, electron emitters, and as filaments in vacuum tubes. Its high melting point and ability to maintain structural integrity at elevated temperatures are crucial for these applications.

High-Temperature Furnaces:

W wire is a preferred material for components in high-temperature furnaces, such as heating elements and support rods. Its resistance to thermal deformation and ability to perform reliably at extreme temperatures make it indispensable in these environments.

Aerospace and Defense:

In the aerospace and defense sectors, W wire is used in applications requiring exceptional durability and strength. It is employed in rocket nozzles, propulsion systems, and high-temperature shielding, where it can withstand the harsh conditions of space and high-speed flight.

Comparative Analysis

While both molybdenum and tungsten wires offer high melting points and thermal stability, their specific properties dictate their applications. W wire’s higher melting point and thermal conductivity make it superior for applications requiring extreme heat resistance, such as lighting filaments and high-temperature furnace components. On the other hand, Mo wire's better workability, lower density, and corrosion resistance make it more versatile for aerospace, electronics, and medical applications.

Chinatungsten Online is a professional manufacturer of tungsten and molybdenum for nearly thirty years. We can supply various types of molybdenum wires as per the uses. Please free feel to contact us when you got the purchasing plans.

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Comparing Molybdenum Wire and Tungsten Wire: Performance

Molybdenum (Mo) wire and tungsten (W) wire are two critical materials in various high-performance applications due to their exceptional properties. Both are refractory metals, characterized by high melting points and excellent strength at elevated temperatures. However, they exhibit distinct differences in performance, making each suitable for specific uses.

Melting Point and Thermal Performance:

W wire has the highest melting point of all metals, approximately 3422°C, significantly higher than molybdenum's melting point of 2623°C. This exceptional thermal stability makes W wire ideal for applications requiring sustained high temperatures, such as filaments in incandescent lamps, electron tubes, and high-temperature furnaces. Mo wire, while also capable of withstanding high temperatures, is more suitable for applications where the operating temperatures are slightly lower but still demanding, such as in aerospace components and heat shields.

Mechanical Strength and Durability:

Both molybdenum and W wires possess high tensile strength, making them durable and resistant to deformation under stress. However, W wire generally offers superior mechanical strength compared to Mo Wire. This makes tungsten preferable for applications requiring extreme durability and rigidity, such as in rocket nozzles and electric discharge machining (EDM) electrodes. Mo Wire, with its slightly lower strength, is often used where a balance of strength and ductility is required, such as in medical devices and electronic components.

Electrical Conductivity:

Tungsten and Mo wires exhibit excellent electrical conductivity, essential for their roles in electrical applications. W wire's higher conductivity makes it an excellent choice for filaments in lighting and heating elements, where efficient electricity-to-heat conversion is crucial. Mo wire, with good conductivity and lower resistivity, is commonly used in the semiconductor industry for gate electrodes and interconnects due to its stable electrical properties at high temperatures.

Corrosion and Oxidation Resistance:

Mo wire generally exhibits better corrosion resistance than W wire, particularly in harsh chemical environments. This makes molybdenum a preferred material in chemical processing industries and applications involving exposure to corrosive substances. W wire, although less resistant to oxidation at high temperatures, can still perform well in inert or vacuum environments, making it suitable for high-vacuum and aerospace applications.

Manufacturing and Cost:

Tungsten wire is typically more challenging to process due to its higher density and hardness, which can make machining and forming more complex and costly. Molybdenum wire, being less dense and slightly softer, is easier to work with, potentially reducing manufacturing costs. This difference can influence the choice between the two materials based on the specific requirements and budget constraints of a project.

Chinatungsten Online is a professional manufacturer of tungsten and molybdenum for nearly thirty years. We can supply various types of molybdenum wires as per the uses. Please free feel to contact us when you got the purchasing plans.

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What Are the Trends or Innovations in the Development of Molybdenum Wire?

Molybdenum wire continues to be a material of significant interest in various high-tech and industrial applications due to its remarkable properties such as high melting point, excellent thermal and electrical conductivity, and significant tensile strength. Recent trends and innovations in the development of Mo wire are focused on enhancing its performance, expanding its applications, and overcoming traditional limitations associated with its use.

Advanced Coatings and Surface Treatments

One of the most notable trends is the development of advanced coatings and surface treatments to enhance the durability and performance of Mo wire. Researchers are exploring various protective coatings to mitigate oxidation and corrosion, particularly in high-temperature environments. For instance, coatings made of materials like silicon carbide (SiC) or aluminum oxide (Al2O3) are being applied to create a barrier against oxygen and other reactive elements. These advancements are particularly beneficial in applications such as aerospace, lighting, and electronics, where longevity and reliability are crucial.

Nanotechnology and Microfabrication

Nanotechnology and microfabrication techniques are revolutionizing the way Mo wire is produced and utilized. These techniques allow for the creation of ultra-fine molybdenum wires with precise dimensions and enhanced properties. For example, the use of electrospinning and other nanoscale fabrication methods has enabled the production of Mo wires with improved tensile strength and flexibility, expanding their application in fields like medical devices, microelectronics, and nanotechnology-based sensors.

Alloy Development

The development of molybdenum-based alloys is another significant trend aimed at enhancing the material’s properties. By alloying molybdenum with other elements such as rhenium, tungsten, or titanium, scientists can improve its ductility, strength, and resistance to oxidation. These alloys are finding increased use in demanding applications such as rocket nozzles, nuclear reactors, and high-performance engines, where enhanced mechanical properties and environmental resistance are essential.

Additive Manufacturing

Additive manufacturing, commonly known as 3D printing, is making significant inroads in the development and utilization of Mo wire. This technology enables the production of complex and customized components that were previously difficult or impossible to manufacture using traditional methods. 3D printing with Mo wire is particularly advantageous in producing intricate components for aerospace, medical implants, and high-precision tools, where bespoke designs and rapid prototyping are highly valued.

Improved Production Techniques

Advancements in production techniques are also contributing to the evolution of Mo wire. Enhanced methods such as plasma arc melting and electron beam melting are being employed to achieve higher purity and better control over the material’s microstructure. These improvements result in Mo wire with superior mechanical and thermal properties, making it more suitable for high-performance applications.

Chinatungsten Online is a professional manufacturer of tungsten and molybdenum for nearly thirty years. We can supply various types of molybdenum wires as per the uses. Please free feel to contact us when you got the purchasing plans.

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How Does the Surface Finish of Molybdenum Wire Affect its Performance?

The surface finish of molybdenum wire is a critical factor that significantly affects its performance and usability across various applications. The surface finish refers to the texture, smoothness, and overall quality of the wire's exterior surface, which can influence properties such as electrical conductivity, mechanical strength, oxidation resistance, and ease of handling. 

Electrical Conductivity

The surface finish of moly wire directly affects its electrical conductivity. A smooth, polished surface reduces electrical resistance and minimizes energy loss, which is crucial in applications such as electronic circuits and electrical contacts. Rough or uneven surfaces can introduce micro-defects and increase resistance, leading to inefficiencies and potential overheating. Therefore, achieving a high-quality surface finish is vital for maintaining optimal electrical performance.

Mechanical Strength and Durability

Mechanical strength and durability are also influenced by the surface finish. A polished surface with minimal defects is less likely to have stress concentrators, which are points where stress is amplified and can lead to cracks or fractures. In contrast, a rough or flawed surface can act as a starting point for mechanical failure, reducing the wire’s overall strength and lifespan. This is particularly important in applications where the wire is subjected to high mechanical loads or repetitive stress, such as in aerospace and automotive components.

Oxidation Resistance

Oxidation resistance is another critical aspect affected by the surface finish. A smooth and clean surface is less prone to oxidation because there are fewer sites for oxygen to react with. In high-temperature environments, moly wire with a poor surface finish can oxidize more rapidly, forming a brittle oxide layer that can compromise the wire's structural integrity. Enhancing the surface finish with protective coatings or surface treatments can significantly improve oxidation resistance and extend the wire's usability in harsh conditions.

Ease of Handling and Fabrication

The ease of handling and fabrication of moly wire is also dependent on its surface finish. A smooth, well-finished wire is easier to work with, whether it is being cut, bent, or integrated into a device. This is particularly important in microelectronics and medical device manufacturing, where precision and accuracy are paramount. A wire with a poor surface finish may require additional processing steps to achieve the desired quality, increasing production time and costs.

Surface Treatments and Coatings

Various surface treatments and coatings can enhance the surface finish of moly wire. Techniques such as electroplating, chemical polishing, and mechanical polishing are commonly used to achieve a high-quality finish. Additionally, protective coatings, such as nickel or chromium, can be applied to improve corrosion resistance and overall durability. These treatments not only improve the wire's performance but also expand its range of applications by making it suitable for more demanding environments.

Chinatungsten Online is a professional manufacturer of tungsten and molybdenum for nearly thirty years. We can supply various types of molybdenum wires as per the uses. Please free feel to contact us when you got the purchasing plans.

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What Are the Challenges When Using Molybdenum Wire in Specific Applications?

Molybdenum wire is renowned for its exceptional strength, high melting point, and excellent electrical conductivity, making it a valuable material in a variety of applications. However, its use comes with several challenges and limitations that need to be carefully considered.

Mechanical Brittleness and Handling

One of the primary challenges of using moly wire is its mechanical brittleness. While molybdenum has high tensile strength, it lacks ductility at room temperature, making it prone to cracking and breaking under mechanical stress. This brittleness can complicate handling and processing, especially in usages requiring fine wires or precise manipulation. Careful handling and specialized equipment are often necessary to prevent damage during manufacturing and installation.

Oxidation at High Temperatures

Molybdenum's high melting point, around 2,623°C, makes it ideal for high-temperature applications. However, it readily oxidizes at temperatures above 400°C in the presence of oxygen. This oxidation forms a volatile oxide, which can degrade the material and impair its performance. To mitigate this, moly wires often require protective coatings or are used in inert or vacuum environments, adding complexity and cost to their use.

Cost and Availability

Molybdenum is relatively expensive compared to other metals used in similar usages. Its cost is driven by the complexities of mining, refining, and processing. Additionally, the availability of high-purity molybdenum can be limited, which can affect supply chains and increase lead times for industries relying on this material. The economic feasibility of using molybdenum wire must be carefully evaluated, especially for large-scale or cost-sensitive projects.

Fabrication Difficulties

The fabrication of moly wire presents its own set of challenges. Its high melting point requires specialized equipment and techniques for drawing the wire, often involving hot working processes. Maintaining the desired dimensions and surface quality during fabrication can be difficult, requiring precise control over manufacturing conditions. These factors contribute to higher production costs and potential variability in product quality.

Chemical Compatibility

In certain usages, the chemical compatibility of moly wire must be considered. Molybdenum can react with certain chemicals, which can limit its use in corrosive environments. For example, it reacts with halogens and acids, which can lead to rapid degradation and failure. Ensuring compatibility with the operational environment is crucial for the reliable performance of moly wire.

Application-Specific Limitations

Different usages impose unique demands on moly wire. In electronics, for instance, the wire's thermal expansion properties must match other materials to prevent failure due to thermal cycling. In lighting, the wire must maintain stability and strength at high temperatures over prolonged periods. These specific requirements necessitate careful consideration of molybdenum's properties and potential modifications to meet application needs.

Chinatungsten Online is a professional manufacturer of tungsten and molybdenum for nearly thirty years. We can supply various types of molybdenum wires as per the uses. Please free feel to contact us when you got the purchasing plans.

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How Does the Purity of Molybdenum Wire Affect its Performance?

The purity of molybdenum wire plays a crucial role in determining its performance and suitability for various applications. Moly wire is renowned for its exceptional mechanical strength, high melting point, and resistance to corrosion and wear. However, the purity of the molybdenum used in its production significantly influences its properties and performance.

High-purity moly wire, typically defined as having a purity of 99.95% or higher, exhibits superior mechanical and thermal properties compared to lower purity grades. The presence of impurities, even in trace amounts, can adversely affect the wire's performance and compromise its reliability in demanding applications.

One of the primary factors influenced by moly wire purity is its mechanical strength. High-purity molybdenum wire demonstrates greater tensile strength, allowing it to withstand higher loads and stresses without deformation or failure. This makes it ideal for applications requiring exceptional durability and resistance to mechanical wear, such as in aerospace components and high-temperature furnace heating elements.

Moreover, the purity of moly wire also influences its thermal conductivity and electrical resistivity. High-purity moly wire exhibits excellent thermal conductivity, making it highly efficient for heat transfer applications, including in heat sinks, electrical contacts, and electronic devices. Additionally, its low electrical resistivity ensures minimal energy loss and optimal performance in electrical applications.

In applications where moly wire is exposed to corrosive environments or high temperatures, such as in chemical processing or semiconductor manufacturing, high-purity grades offer superior resistance to corrosion and oxidation. This ensures prolonged service life and reliability under harsh operating conditions, reducing maintenance requirements and downtime.

Overall, the purity of moly wire directly impacts its mechanical strength, thermal conductivity, electrical resistivity, and corrosion resistance, all of which are critical factors in determining its performance and suitability for specific applications. Therefore, selecting the appropriate purity grade of moly wire is essential to ensure optimal performance and reliability in various industrial and technological applications.

Chinatungsten Online is a professional manufacturer of tungsten and molybdenum for nearly thirty years. We can supply various types of molybdenum wires as per the uses. Please free feel to contact us when you got the purchasing plans.

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Enhancing Performance: The Redrawing Process of Molybdenum Wire

Redrawing molybdenum wire refers to the process of passing molybdenum wire through a series of dies to reduce its diameter while maintaining its length. This process is typically conducted at elevated temperatures to improve the wire's ductility, allowing it to undergo deformation without breaking. 

Redrawing enhances the wire's properties and adapts it for specific uses by controlling the speed, tension, and temperature during the process. The resulting wire possesses increased strength, flexibility, and surface quality, making it suitable for various applications in industries such as electronics, aerospace, heating elements, and medical devices.

Redrawing Process:

Redrawing molybdenum wire involves passing the wire through a series of dies to reduce its diameter while maintaining its length. This process is typically conducted at elevated temperatures to improve the wire's ductility, allowing it to undergo deformation without breaking. By controlling the speed and tension during redrawing, manufacturers can achieve the desired diameter and surface finish of the wire.

Techniques and Equipment:

Several techniques are employed in the redrawing process, including wet and dry drawing. Wet drawing involves the use of lubricants to reduce friction and enhance the wire's formability, while dry drawing relies on controlled atmospheric conditions to minimize oxidation during deformation.

Advanced equipment such as wire drawing machines equipped with precision dies and monitoring systems ensures consistent dimensional accuracy and surface quality throughout the redrawing process. Additionally, in-line annealing may be employed to relieve internal stresses and improve the wire's mechanical properties.

Chinatungsten Online is a professional manufacturer of tungsten and molybdenum for nearly thirty years. We can supply various types of molybdenum wires as per the uses. Please free feel to contact us when you got the purchasing plans.

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Why Can Molybdenum Wire Cut Metal?

Molybdenum wire is used in a process known as Wire Electrical Discharge Machining (Wire EDM or WEDM) to cut or shape metal and other conductive materials. It can cut metal for several reasons:

Electrical Discharge Machining (EDM) Principle: Wire EDM is a non-traditional machining process that uses a thin wire electrode to cut through the workpiece material using electrical discharges. It relies on the phenomenon of electrical sparks (discharges) between the wire and the workpiece, which can remove material through a controlled spark erosion process.

Conductivity: Molybdenum is a highly conductive material. It allows electrical currents to pass through it easily, making it suitable for use as an electrode in EDM. When an electric current is applied to the moly wire, it generates localized electrical discharges that melt and vaporize the workpiece material.

High Melting Point: Molybdenum has a very high melting point (approximately 2,623 degrees Celsius or 4,753 degrees Fahrenheit). This property allows moly wire to withstand the extreme heat generated during EDM without melting or deforming.

Precision and Accuracy: Wire EDM is known for its high precision and accuracy in cutting intricate shapes and contours in various metals. The thin moly wire can create very fine cuts and tight tolerances, making it suitable for applications in industries such as aerospace, medical devices, and toolmaking.

Non-contact Process: Unlike traditional machining methods that involve physical cutting tools, Wire EDM is a non-contact process. The moly wire does not touch the workpiece, reducing wear and eliminating the risk of tool breakage.

Heat-Affected Zone (HAZ): Wire EDM generates a minimal heat-affected zone in the workpiece, which means there is little to no distortion or metallurgical changes in the material being cut. This is beneficial for cutting materials that are sensitive to heat, like hardened tool steel.

Overall, molybdenum wire is a crucial component in Wire EDM, a highly precise and effective method for cutting and shaping metal and other conductive materials without introducing mechanical stresses. This makes it a preferred choice in industries where precision and quality are of utmost importance.

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The Usages and Production Process of Molybdenum Wire

As a typical molybdenum product, molybdenum wire is a kind of thin wire after forging and drawing of molybdenum rod. With high purity of more than 99.95% and owing the advantages of molybdenum metal, it can be widely used in the various fields. 

Generally, the diameter is between 0.02-12.00mm. It is worth mentioning that, in order to further improve the its performance and expand its application range, manufacturers often add lanthanum, yttrium and other rare earth elements in its manufacture.

In terms of physical and chemical properties, the color of moly wire is silver gray or black (surface covered with graphite), with higher melting point, higher density, higher tensile strength, lower resistivity, and lower thermal expansion, coefficient, small elongation, good high temperature resistance and acid and alkali resistance. It should be noted that when heated in air, it will react with oxygen; the overall performance of doped wires is generally better than that of pure wires

From the production process point of view, pure wire is a kind of product that uses hot and cold drawing combined process to process high temperature molybdenum raw material into filament. The production method of doped wire is a solid-liquid doping method, that is, adding an appropriate amount of solid solution metal elements and rare earth oxides to solid molybdenum dioxide, then mixing evenly, and finally performing hydrogen reduction and isostatic pressing. , sintering, hammer tandem, hot wire drawing, annealing and cold wire drawing.

In terms of usages, moly wire is generally used for winding core wire, bracket, lead wire, electronic tube reed, grid, heating element, molybdenum foil belt, wire cutting high temperature components, auto parts spraying, etc.

In terms of storage methods, molybdenum wire is generally placed in a ventilated and cool place with low humidity and temperature to avoid oxidation. In addition, the problem of poor verticality may occur when it is left for more than 6 months.

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Molybdenum Wire Applications

The molybdenum wire is principally used in the high-temperature field of molybdenum furnace and radio tube outlets, also in thinning the molybdenum filament, and the molybdenum rod in heating materials for high-temperature furnace, and side-bracket/bracket/outlets wire for heating materials.

Molybdenum wire recommend applications:

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The Molybdenum Wire

Molybdenum is a metal silvery in color with properties that make it one of the most prized industrial metals. It melts at 4,753 degrees Fahrenheit (2,623 degrees Celsius) - one of the highest melting points of any metal - and has the ability to withstand very high pressure and temperature without softening or expanding much. These properties make molybdenum wire useful in various products, like automotive and aircraft components, electric vacuum devices, light bulbs, heating elements, and high-temperature furnaces. Molybdenum wire can also be used for printer needles and other printer parts. Depending on what the molybdenum wire is to be used for, it can be made from pure molybdenum, from a mix of molybdenum and other materials such as potassium silicate, or from alloys of molybdenum and other metals, for example tungsten.

Molybdenum wire is often used to make parts that provide structural support, even at very high temperatures. For example, it is commonly used for various furnace components, like heating elements, outlets and windings. Its high melting point makes molybdenum wire suitable for specialized, high-temperature furnaces featuring hydrogen or vacuum atmospheres.

Another common use for molybdenum wire is as parts for light bulbs. For example, it can be used in the manufacture of supports for lamp filaments made from tungsten, to make leads for halogen lamp bulbs, and to make electrodes for gas discharge lamps and tubes. This type of wire is also used in the windshields of airplanes, where it functions as a heating element, providing defrosting. Molybdenum wire is also used in the manufacture of electron tubes and power tube grids.

The surface of the wire can either be clean or coated. Coated wire is black in color, because it is covered in oxides and lubricants. The tensile strength of wire is often an important consideration in manufacturing, and also affects the appearance of the wire: the more tensile strength, the less straight the wire is.

Molybdenum wire commonly comes in sizes from 0.001 inches (0.025 mm) in diameter, to 0.25 inches (6.35 mm) in diameter. Its size can be measured either in inches, or in mils, with 1 mil being equal to one thousandth of an inch. For very thin wire, the size is expressed in the form of weight of a certain length of wire, rather than by diameter. Molybdenum is similar in appearance to lead, and even received its name from the Greek word for lead, molybdos, because it was often mistaken for lead in ancient times.

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Tips for Molybdenum Wire Service Life Extension

Tips for extending the service life of molybdenum wire are as follows:

1. Molybdenum wire operation
During discharge operation, molybdenum wire worked with the workpiece will damage itself, but because of molybdenum has good mechanical properties, so the loss will not obvious. In order to extent the life of molybdenum wire, when the machine is replaced on new molybdenum wire, there should use small energy processing parameters for cutting, which can reduce the damage of molybdenum wire. After machine running a period of time, molybdenum wire color is basically white and then use the normal high current for cutting. In addition, after the replacement of molybdenum wire and before cutting, molybdenum wire should operate without workpiece cutting for 5-10 minutes, so that the internal stress of molybdenum wire can be released.

Molybdenum wire usually fails in the process of cutting operation and the majority of broken end is in the wire cylinder after the exchange of ten to dozens of laps. From this we can see both ends of the molybdenum wires are easier to be broken. Therefore, during operation, at regular intervals, the molybdenum wire tube should be adjusted.

2. Molybdenum wire maintenance

Daily molybdenum wire maintenance can also improve its service life, such as daily molybdenum wire storage, placement and storage time and so on. Molybdenum wire should be reported on the low humidity, ventilated and shady places and the temperature is at 20 ℃ ~ 25 ℃, to avoid oxidation. Another molybdenum wire placed in the time should not exceed 6 months, because longer time storage is more likely to show the problem of perpendicular. Before using should to check whether the packaging is damaged or deformed.

3. Molybdenum wire installation
Molybdenum wire is easily deformed and broken, so it should not be bended in the process of installation. If there are bends, the bends should be cut off to avoid broken wires in the course of operation. In the course of the use the cutting fluid should be replaced, because cutting fluid after a long time use will turn to black, which will directly affect the performance of molybdenum wire, leading to molybdenum wire fracture.

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China Molybdenum Wire Introduction

Molybdenum wire is an important product among molybdenum finished products and its total production accounted for 13% of molybdenum deep processing product’s total output. China molybdenum wire is divided into pure molybdenum wire and doped molybdenum wire and the diameter is generally between 0.051 to 0.350mm. The brands of China molybdenum wires are Mo1, Moδ, Mo2, Mo3, Mo3 δ. There Mo1 and Mo2 are pure molybdenum and Mo3 is doped molybdenum wire which is doped with Ca, Mg and other elements. Molybdenum wire main production processes are mainly as follows: First, through the powder metallurgy method can obtain molybdenum powder and the metal powder after sintering will produce molybdenum bar.

Secondary, the molybdenum bar is processed rotary forging or rolling to obtain molybdenum rod. Finally, after tensile process the manufacturers can manufacture molybdenum wire with required diameter. Compared with foreign molybdenum wire, there are some shortages on China molybdenum wire. The main problem is simple product structure. Besides, molybdenum billet is lighter and the average length of molybdenum wire is shorter. Further, uneven thickness of molybdenum wire is obvious and the surface has some shortcomings, such as trench, burr and easy to break and other.

 China's molybdenum wire trade developed rapidly in recent years, from 1996 to 2000, molybdenum wire exports accounted for 22.3% of imports and exports total trade volume. The exported molybdenum wire is mainly used in the picture tube industry, molybdenum coating industry and wire cutting industry.

At present, China's molybdenum wire production technology and equipment have been very perfect, and with the development of production technology, China molybdenum wire can not only meet the domestic market, but also can demand foreign market, so there are more than 10 tons molybdenum wire for export.

However, China's molybdenum wire in quality, innovation and other aspects still has some problems. In order to accelerate the development of molybdenum wire, China should first accelerate the development of molybdenum leading company to concentrate other scattered enterprises, in order to scale, multi-species, high-quality produce molybdenum wire. In addition, the molybdenum companies should through purchase the advanced production equipment and improve production methods to improve the quality of molybdenum wire products. Finally, they should combine with market demand to develop new varieties.

Molybdenum Wire Properties Requirements

Molybdenum wire is divided into different types according to different applications, including spraying molybdenum wire, molybdenum wire for electric light source, molybdenum wire for heating furnace, molybdenum wire for electronic device and molybdenum cutting wire and so on. The quality of molybdenum wire mainly depends on its chemical composition, mechanical properties, surface finish, piece weight and dimensional tolerances, and different molybdenum wire products’ quality and properties requirements are somewhat different.

Spraying molybdenum wire, mainly used for high temperature, corrosion resistance and impact resistance parts, so compared to other molybdenum wire products the specification is bigger. There are some common dimensions d3.17mm, d2.3mm and d1.59mm. In order to ensure the spray performance and to prevent impurities contamination on the substrate, but also to meet the requirement of molybdenum spraying equipment, the wire should meet the following requirements: purity ≥ 99.93%, density: 10.2g / cm3, hardness HV ≥ 320, diameter size: 1.0 ~ 4.0mm , tensile strength: 700 ~ 850MPa, elongation: 15%, the surface: without cracks, burrs, then marks, oil and other defects. In addition, when molybdenum wire finish size is between 1.59 ~ 6.5mm, the tolerance should be ≤± 0.05mm.

 The other molybdenum wire products’specifications are in the general range of d0.02 ~ 2.50mm. The molybdenum wire for electric light source is mainly used as filament holder and tungsten spiral core wire, so the molybdenum wire should have uniformity diameter, good flatness, high strength, high temperature performance and stability, and in order to prevent the winding, brittle fracture during forming and using should also require a certain flexibility, which is elongation to reach 15% to 25%.

Molybdenum wire for heating furnace is mainly used in heating element of industrial furnace, so the wire diameter is bigger than electric light source used molybdenum wire and high temperature performance is an important quality indicator.

Vacuum electronic devices used molybdenum wire and molybdenum cutting wire for EDM due to special using conditions, so the manufacturers have high requirements on precision and reliability, so its quality and properties requirements are more stringent. The requirements are as follows: having a larger elongation and high tensile strength, size deviation to allow the range of ≤ 1.0%.