2021年3月8日星期一

What Are Types and Uses of Molybdenum Wires?

Molybdenum is a genuine all-rounder. For example, filament products are used in the lighting industry, semiconductor substrates for power electronics, glass melting electrodes, hot zones in high-temperature furnaces, and sputtering targets for flat panel displays. They are everywhere in our daily life. 

As one of the most highly valued industrial metals, molybdenum material has a very high melting point and will not soften or expand much even under high pressure and temperature. Due to these characteristics, wires made of molybdenum have a wide range of applications, such as automotive and aircraft parts, electric vacuum devices, light bulbs, heating elements and high-temperature furnaces, printer needles and other printer parts.

molybdenum wires image

There are many types of molybdenum wires, including pure moly wire, high-temperature molybdenum wire, molybdenum spray wire and molybdenum wire for EDM. Different types have different characteristics, and their uses are also different.

Pure molybdenum wire has high purity, and its surface is black. After alkali washing, it becomes white. With the characteristic of good electrical conductivity, it can be used as a part of light bulbs. For example, it is used to manufacture filament holders made of tungsten, lead wires for halogen bulbs, and electrodes for gas discharge lamps and tubes. This type of metal wire is also applied in aircraft windshields, where it acts as a heating element to provide defrosting function. In addition, it can be used to make electron tubes and power tube grids.

molybdenum wires image

High-temperature molybdenum wire is also named molybdenum lanthanum wire. This molybdenum-based alloy is more popular than pure molybdenum because it has a higher recrystallization temperature, is stronger and more ductile after exposure to high temperatures. In addition, after being heated to above its recrystallization temperature and processed, the alloy forms an interlocking grain structure to help resist sagging and structural stability. Therefore, it is often used for high-temperature structural materials, such as printing pins, nuts and screws, halogen lamp holders, high-temperature furnace heating elements, and lead wires for quartz and high-temperature ceramic materials.

The molybdenum spray wire is mainly used for wear-prone automotive parts, such as piston rings, gearbox synchronization parts, gear selector forks, etc. A thin layer of coating is formed on the worn surface, which gives vehicles and parts good sliding properties coupled with excellent wear resistance.

molybdenum wires image

While used for EDM, molybdenum wire can cut almost all conductive materials. This would include metals such as steel, aluminum, brass, titanium, and other types of aggregates and superalloys. The hardness of the material is not a factor in EDM machining.

As a professional manufacturer of tungsten and molybdenum with more than 20 years of production experience, Chinatungsten Online can provide all types of molybdenum wires mentioned above for use in various industries.

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2021年3月3日星期三

Molybdenum Alloy Plugs to Pierce Stainless Steel Pipes

There are two kinds of steel pipes – stainless steel pipes and welded steel pipes, according to their production methods. Compared with welded steel pipes and other steels, stainless steel pipes are pierced with tools such as plugs and mandrels.

These piercing tools not only participate deformation, but also are the most important factors that determine whether the main processers of steel pipe production, such as piercing and pipe rolling can operate normally. As a matter of fact, the production process of seamless steel pipe also reflects the technical level of these tools. In other words, the research on internal deformation tools is an important subject of seamless steel pipe technology research.

molybdenum alloy plugs image

Molybdenum alloy plugs are used to pierce seamless tubes of different materials, such as stainless steel, brazing steel, high-temperature alloy steel and other special parts. As they work in high temperature and harsh environments, the material of plug requires the characteristics of high temperature strength, high temperature oxidation resistance, long service life, corrosion resistance and not easy to stain glass.

Therefore, the material of the plug usually adopts molybdenum alloy with a composition of Ti, Zr, C and Mo. Molybdenum alloy plug is produced in a powder metallurgy process, has a higher recrystallisation temperature and higher strength compared to pure molybdenum, and is readily deformable even at room temperature. These effects are due to mixed crystal formation between Mo and Ti as well as the precipitation of ZrC as a dispersoid.

stainless steel pipes image

Actually, the materials to be used depends on what kinds of steel pipes to be pierced. Different materials of pipes have different characteristics and thus require plugs to meet different working conditions. As a professional manufacturer of molybdenum and tungsten, Chinatungsten Online can offer you various kinds of piercing plug. Certainly, customized designs are welcomed. Send us drawings and inform us its detailed application, we will offer you the best solution. 

If you have any inquiry of molybdenum alloy plugs, please feel free to contact us:
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2021年2月23日星期二

MoS2 Rectifier Can Convert Wi-Fi Signals into Electrical Energy

An ultra-thin two-dimensional device that can convert alternating electromagnetic waves such as Wi-Fi signals propagating in the air into electrical energy was reported to be developed by engineers at the Massachusetts Institute of Technology (MIT). The device can effectively improve the flexibility of existing rectenna system and expand the size of terminal equipment. 

You may be curious about the device. Actually, it is a rectifier made up of molybdenum disulfide (MoS2). The antenna is a kind of energy conversion device and transmitting antenna converts the guided wave into a space radiated wave, and the receiving antenna converts the space radiated wave into a guided wave. It is widely used in engineering systems such as radio communication, broadcasting, television, radar, navigation, electronic countermeasures, remote sensing, radio astronomy, etc. Although it brings certain convenience to the society, the scope of application is still quite limited.

molybdenum disulfide powder image

In order to further enhance the flexibility and scalability of the rectenna system, MIT researchers used molybdenum disulfide components to construct a new type of rectifier, which can better convert electromagnetic waves into electric current. According to the researchers, the MoS2 rectifier can capture and convert wireless signals up to 10GHz with an energy efficiency of about 30%-more flexible and faster than other designs. Of course, there are other technologies that can achieve nearly 60% efficiency.

However, the power generated by the MoS2 solution is relatively small, but it is still very suitable for use in small wearable or medical electronic devices, eliminating the need for batteries. Relevant research results have been published in the recently published "Nature" journal. The original title is: "Two-dimensional MoS2-enabled flexible rectenna for Wi-Fi-band wireless energy harvesting".

MoS2 rectifier image

The two-dimensional MoS2-enabled flexible rectenna is a low-dimensional wide band gap semiconductor material, and the thickness of the layer is only equivalent to three atoms, which has excellent electrochemical performance and semiconductor effect. 

At present, there are many methods for preparing MoS2, such as ammonium tetrathiomolybdate thermal decomposition method, hydrogen sulfide or sulfur vapor reduction method, high-energy ball milling method, carbon nanotube space confinement method, hydrothermal synthesis method, high-energy physical means and chemistry law combination and so on.

If you have any inquiry of MoS2 powder, please feel free to contact us:
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2021年2月4日星期四

How do Impurities of Glass Material Affect Service Life of Molybdenum Electrode?

Among the types of cups and pots on the market, glass is the healthiest, safest, and most widely used cups, according to relevant research data. There are various kinds of glasses in the market, but only those with pure glass material, crystal clear body, and moist feel are deeply loved by consumers. How to produce high-quality glass? 

The production process of glass is batching, melting, forming, sintering and annealing. Among them, melting is extremely important for the quantity of finished products and is the top priority in the process. The prepared raw materials are heated in a glass furnace at a high temperature to form a uniform and bubble-free glass liquid. This is a very complicated physical and chemical reaction process, and the quality control of the electrodes used as electric heating should be very strict for each glass factory. 

molybdenum electrode image

The glass melting electrode must be able to withstand corrosive glass melting and strong high temperature. Bubbles are not permitted in the process of contact with molten glass, and the product of corrosion of electrode material must not bring any defect to finished glass. Now pure molybdenum material is proved to be the most suitable material for these challenging conditions, considering its characteristics of excellent creep resistance, outstanding corrosion resistance, high purity and good thermal and electrical conductivity.

However, the glass melting process is usually accompanied by various problems.

molybdenum electrode image

Glass hybrid materials usually contain chemical impurities, such as As2O3, Sb2O3 and sulfur. If they react with cerium oxide, they will make the glass yellow. If the iron, chromium and other elements in the raw materials exceed the standard, the glass will turn green or yellow, which will waste a lot of decolorizing agent. In the glass furnace, over chemical impurities will have a serious impact on normal operation of the electrode.

Nitric acid water is a liquid mixture mainly composed of sodium sulfate and sodium fluoride. The presence of a large amount of sodium ions makes it highly conductive and always floats on the viscous layer of liquid glass. At the junction of recycling cooling water and electrode jacket, the electrode is short but with high current density. If the nitric acid water reacts with the electrode, the molybdenum electrode will be far unable to carry the current density and then break.

molybdenum electrode image

The purity of the molybdenum electrode is very important, which requires at least 99.95% and the content of impurities needs to be controlled under a certain value to prevent the purity problem from affecting the service life. At the same time, the quality of glass material also needs to be guaranteed. Nitric acid water seems trivial, but it can destroy countless electrodes.

If you have any inquiry of molybdenum electrode, please feel free to contact us:
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2021年2月2日星期二

Molybdenum Alloy Plugs to Pierce Stainless Steel Pipes

There are two kinds of steel pipes – stainless steel pipes and welded steel pipes, according to their production methods. Compared with welded steel pipes and other steels, stainless steel pipes are pierced with tools such as plugs and mandrels.

molybdenum alloy plugs image

These piercing tools not only participate deformation, but also are the most important factors that determine whether the main processers of steel pipe production, such as piercing and pipe rolling can operate normally. As a matter of fact, the production process of seamless steel pipe also reflects the technical level of these tools. In other words, the research on internal deformation tools is an important subject of seamless steel pipe technology research.

Molybdenum alloy plugs are used to pierce seamless tubes of different materials, such as stainless steel, brazing steel, high-temperature alloy steel and other special parts. As they work in high temperature and harsh environments, the material of plug requires the characteristics of high temperature strength, high temperature oxidation resistance, long service life, corrosion resistance and not easy to stain glass.

stainless steel pipes image

Therefore, the material of the plug usually adopts molybdenum alloy with a composition of Ti, Zr, C and Mo. Molybdenum alloy plug is produced in a powder metallurgy process, has a higher recrystallisation temperature and higher strength compared to pure molybdenum, and is readily deformable even at room temperature. These effects are due to mixed crystal formation between Mo and Ti as well as the precipitation of ZrC as a dispersoid.

Actually, the materials to be used depends on what kinds of steel pipes to be pierced. Different materials of pipes have different characteristics and thus require plugs to meet different working conditions. As a professional manufacturer of molybdenum and tungsten, Chinatungsten Online can offer you various kinds of piercing plug. Certainly, customized designs are welcomed. Send us drawings and inform us its detailed application, we will offer you the best solution. 

If you have any inquiry of molybdenum alloy plugs, please feel free to contact us:
Email: sales@chinatungsten.com/sales@xiamentungsten.com
Tel.: +86 592 5129696/+86 592 5129595
Fax: +86 592 5129797

Scan QR code of Chinatungsten Wechat platform to follow up the daily latest price and market of tungsten, molybdenum and rare earth.

2021年1月27日星期三

Molybdenum Metal Parts Are Crucial to HIP Furnace Performance

To improve the safety and efficiency of technology and minimize the impact on the environment, the realization of this goal often directly depends on the development of materials. Hot isostatic pressing (HIP) has been at the forefront of this field for decades. Recent technological advances have improved the production efficiency of parts manufactured by HIP technology and reduced costs. Molybdenum metal parts are critical to HIP furnace performance.

molybdenum metal components image

HIP is an economical and effective method to improve material properties such as toughness and fatigue life, which can improve the safety and reliability of materials and components, extend their service life, and reduce the risk of failure during operation. It can even repair parts that are already in use but have some internal damage. For example, turbine blades form pores during operation, and these pores can be closed by the HIP process to restore them to normal and put them back into use.

Why molybdenum is important?

The melting point of molybdenum is as high as 2623°C, it has high strength at high temperature, and the cost is lower than other materials. It is the material of choice for hot isostatic pressing. Heating elements, heat shields, furnace racks and other internal equipment are mainly made of molybdenum alloy.

molybdenum metal components image

The new HIP furnace has the functions of heat treatment and rapid cooling. It uses a thermal cycle. Due to the existence of thermal expansion stress, pressure is inevitably generated on the heating element and other internal components. Molybdenum has a low thermal expansion coefficient and high thermal conductivity. The combination of the two can minimize the thermal cycle stress and make these complex HIP furnaces have a long service life.

With the rapid increase in the demand for HIP processing and the acceleration of turnaround time, heat treatment companies have also begun to set foot in this industry. However, as AM gradually develops to produce more parts at the same time, it is expected that large vessels with high pressure heat treatment capabilities will be required in the future. Molybdenum has been supporting the development of HIP technology and will continue to play its important role as the industry develops.

If you have any inquiry of molybdenum products, please feel free to contact us:
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2021年1月25日星期一

Molybdenum Can Increase the Strength and Hardness of Cast Iron

Molybdenum-base alloys and the metal itself have useful strength at temperatures above which most other metals and alloys are molten. The major use of molybdenum, however, is as an alloying agent in the production of ferrous and nonferrous alloys, to which it uniquely contributes hot strength and corrosion resistance, e.g., in jet engines, combustion liners, and afterburner parts. It is one of the most effective elements for increasing hardenability of iron and steel, and it also contributes to the toughness of quenched and tempered steels.

molybdenum parts image

Molybdenum can increase the strength and hardness of cast iron by lowering the pearlite transition temperature. It can also improve the high temperature strength and creep resistance of the material. Compared with molybdenum-free high-chromium cast iron, high-chromium cast iron containing 2-3% molybdenum has significantly higher impact toughness, and is very suitable for use in harsh wear conditions such as mining, grinding, and crushing. 

The performance of these cast iron castings is qualified, and expensive heat treatment is not necessary. It is a cost-effective alternative to other abrasive materials. The reduction in the content of austenite forming elements such as nickel and manganese also minimizes the retention of the low-temperature austenite phase that is a potential cause of premature component failure. 

molybdenum parts image

The application of high silicon-molybdenum ductile iron with a silicon content of up to 4% and a molybdenum content of 1% has aroused increasing interest. They have good strength at temperatures as high as 600°C and become feasible and cost-effective materials for high-temperature applications to replace higher alloyed steel materials, such as turbocharger housings, engine exhaust manifolds and heating furnace components as well as other applications.

Austenitic austempered ductile iron has a unique microstructure, its strength can exceed 1000 MPa (145 ksi), and it has good impact toughness. Their outstanding performance is very suitable for key applications such as large gears and crankshafts required for power generation, ship propulsion and large mining equipment.

If you have any inquiry of molybdenum products, please feel free to contact us:
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