2017年9月27日星期三
2017年9月25日星期一
Molybdenum Wire Applications
Molybdenum wire is a kind of molybdenum products, it has the excellent properties, such as high melting point (2620 ℃), high density (10.2g/cm3), high strength rare refractory metals, thermal expansion coefficient, good thermal conductivity, high strength, high temperature, wear resistance, corrosion resistance and other excellent physical and chemical properties. Molybdenum wire applications are widely, which is usually used in the fields of aviation and aerospace, metallurgy, machinery and electronics, automobile manufacturing and so on. According to its application, it can be divided into spraying molybdenum wire, molybdenum cutting wire, molybdenum heating wire and so on. Molybdenum wire is mainly used in the picture tube industry, spraying industry and wire cutting industry.
Molybdenum wire has good high temperature, wear resistance and high strength properties, so it is often used in the molybdenum coating industry for spraying automotive wear-resistant devices such as gearbox and push fork fork, engine piston ring, synchronous ring, brake pads, heat moment adders, cylinder body surfaces and others. Molybdenum wire used in the spraying industry has the following requirements, the minimum purity more than 99.5%, strict controlled on C, Na, O2 and other impurity elements. At the same time, molybdenum wire surface should to be smooth, no cracks, burrs, oil and other defects.
In the picture tube industry, molybdenum wire is mainly used in electron gun and the annual demand is about 15 million meters. There are high requirements on molybdenum wire in this industry, including molybdenum content (greater than 99.5%), specifications (0.127mm, 37.3mg / 200mm) and impurities and so on.
Molybdenum wire has good high temperature, wear resistance and high strength properties, so it is often used in the molybdenum coating industry for spraying automotive wear-resistant devices such as gearbox and push fork fork, engine piston ring, synchronous ring, brake pads, heat moment adders, cylinder body surfaces and others. Molybdenum wire used in the spraying industry has the following requirements, the minimum purity more than 99.5%, strict controlled on C, Na, O2 and other impurity elements. At the same time, molybdenum wire surface should to be smooth, no cracks, burrs, oil and other defects.
The application amount of molybdenum cutting wire in cutting field in 2000 reached 260 million meters, and in the future the application amount will continue to grow. Molybdenum cutting wire used in cutting industry has some requirements, such as molybdenum content not less than 99.3%, having good tensile strength, low elongation, large crimp rate, uniform diameter, and the surface without oxide layer.
2017年9月22日星期五
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.
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.
2017年9月19日星期二
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%.
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%.
2017年9月15日星期五
Titanium Zirconium Molybdenum Nut（TZM Nut）
Titanium zirconium molybdenum bolt (TZM bolt) belongs to TZM customized products. It is produced by powder metallurgy method and the purity level is over 99.5%. The shape of TZM bolt is similar to ordinary bolt, but it has good high temperature property and corrosion resistance property, and it often used in conjunction with the TZM nut.
Titanium zirconium molybdenum nut (TZM nut) is the most basic high temperature components in industry, and it as the most basic but the most important parts are mainly used in high-temperature vacuum furnace thermal field, sapphire thermal field and other high-temperature environments. TZM nut is usually used in conjunction with TZM screw for preventing long-term use at high temperatures the screw under deformation or even melt.
Titanium zirconium molybdenum nut (TZM nut) is the most basic high temperature components in industry, and it as the most basic but the most important parts are mainly used in high-temperature vacuum furnace thermal field, sapphire thermal field and other high-temperature environments. TZM nut is usually used in conjunction with TZM screw for preventing long-term use at high temperatures the screw under deformation or even melt.
2017年9月11日星期一
China Tungsten Market Analysis
The price of molybdenum concentrate, sodium molybdate and ammonium molybdate continues to be steady. Last week, domestic molybdenum market showed signs of recovering. Shipments in miners increased, trading volume is improved and molybdenum concentrate price remained strong. Biddings in the steel mills entered and ferromolybdenum price is expected to rise. As for molybdenum alloy and chemical market, markers are waiting the coming of heat reason to release the demand, and buyers are reluctant to sell. Overall, the supply and demand in the molybdenum market are improving. Insiders are generally optimistic about the performance of molybdenum prices in September. We suggest paying close attention to changes in fundamentals in the afternoon market.
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2017年9月8日星期五
Molybdenum Oxide Introduction
Molybdenum oxide is the chemical compound with the formula MoO3. It is a violet-colored solid and is a metallic conductor. It crystallizes in a monoclinic cell, and has a distorted rutile, (TiO2) crystal structure. In MoO2 the octahedra are distorted, the Mo atoms are off-centre, leading to alternating short and long Mo – Mo distances. The short Mo – Mo distance is 251 pm which is less than the Mo – Mo distance in the metal, 272.5 pm. The bond length is shorter than would be expected for a single bond. The bonding is complex and involves a localization of some of the Mo electrons in a conductance band accounting for the metallic conductivity.
The major use of roasted molybdenite concentrate is to add molybdenum to steel produced in the electric arc furnace.The material may be added to the charge or to the molten bath. For the adjustment of the final analysis, the use of roasted molybdenite concentrate is not recommended.
For optimum recovery the following should be observed. If added with the charge, the roasted molybdenite concentrate containing packages should always be covered with scrap or liquid metal. If added to the bath, the product should be introduced under the slag level. If used in the electric arc furnace, direct contact with the electrodes should be avoided.
Analysis of molybdenum oxide
Molybdenum Oxide 57.00% min
Copper 0.50% max
Sulfur 0.10% max
Phosphorus 0.05% max
Material with other copper contents is available.
The major use of roasted molybdenite concentrate is to add molybdenum to steel produced in the electric arc furnace.The material may be added to the charge or to the molten bath. For the adjustment of the final analysis, the use of roasted molybdenite concentrate is not recommended.
For optimum recovery the following should be observed. If added with the charge, the roasted molybdenite concentrate containing packages should always be covered with scrap or liquid metal. If added to the bath, the product should be introduced under the slag level. If used in the electric arc furnace, direct contact with the electrodes should be avoided.
Analysis of molybdenum oxide
Molybdenum Oxide 57.00% min
Copper 0.50% max
Sulfur 0.10% max
Phosphorus 0.05% max
Material with other copper contents is available.
2017年9月7日星期四
Ultrafine α-molybdenum Oxide Production Process
Ultrafine α-molybdenum production process, including: the ammonium dissolved in the water, get molybdate supernatant; preparation of acetic acid, adding hydrogen peroxide, are acidic precipitation agent.
Heating reactor; same side of the precipitating agent slowly dropped into the acidified ammonium molybdate solution, while stirring, until the solution pH value of 3.0 to 4.0; filtering the reaction solution, get yellow - white precipitate, placed in drying oven, get massive molybdenum oxide, and then crushed and sieved to obtain molybdenum oxide meal.
Heating reactor; same side of the precipitating agent slowly dropped into the acidified ammonium molybdate solution, while stirring, until the solution pH value of 3.0 to 4.0; filtering the reaction solution, get yellow - white precipitate, placed in drying oven, get massive molybdenum oxide, and then crushed and sieved to obtain molybdenum oxide meal.
Roasting; The jet mill to obtain ultrafine α-molybdenum powder.
Background of the invention solves the technical difficult to achieve large-scale production; of equipment, raw materials for high, easy to control the production process, or poor security, filtering difficult technical problems. Invention of cheap raw materials, easy to get, the production process, equipment is simple, low cost, high yield and product dispersion, high purity.
2017年9月1日星期五
Molybdenum Disulfide Properties and Chemical Properties
Molybdenum disulfide properties are stable, so it is usually made into lubricants widely used in high temperature, low temperature and vacuum conditions, which is a good lubricant for various mechanical parts. It is a black solid powder, soapy feeling, odorless, hexagonal or orthorhombic system, with metallic luster and its properties is similar to graphite. Its physical and chemical properties are as follows: Physical properties: chemical formula: MoS2, melting point: 1185 ℃, density: 4.80g / cm3 (14 ℃), Mohs hardness: 1.0-1.5. Chemical properties are as follows: it will not dissolve in water, dilute acid and concentrated sulfuric acid, but soluble in hot sulfuric acid. In other acids, alkalis, solvents, petroleum, synthetic lubricants also will not dissolve.
Molybdenum disulfide (MoS2) is a kind of good solid lubricating material. It has excellent lubricity to the equipment under the conditions of high temperature, low temperature, high load, high speed, chemical corrosion and modern ultra-vacuum. It is usually as anti-friction agent, antiwear agent, extreme pressure agent and antioxygen used in aerospace industry (vacuum anti-radiation lubrication), automobile industry (fixer and parts), anti-seizure industry (mechanical industry) (general lubrication), mining industry, military industry, shipbuilding industry, heavy industry, bearing industry, gear industry and assembly industry. In addition, it can also be used as additives for various lubricants, manufacturing molybdenum compounds, catalytic hydrogenation desulfurization catalyst, gas storage materials, and photovoltaic materials and so on.
Molybdenum disulfide (MoS2) is a kind of good solid lubricating material. It has excellent lubricity to the equipment under the conditions of high temperature, low temperature, high load, high speed, chemical corrosion and modern ultra-vacuum. It is usually as anti-friction agent, antiwear agent, extreme pressure agent and antioxygen used in aerospace industry (vacuum anti-radiation lubrication), automobile industry (fixer and parts), anti-seizure industry (mechanical industry) (general lubrication), mining industry, military industry, shipbuilding industry, heavy industry, bearing industry, gear industry and assembly industry. In addition, it can also be used as additives for various lubricants, manufacturing molybdenum compounds, catalytic hydrogenation desulfurization catalyst, gas storage materials, and photovoltaic materials and so on.
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