Molybdenum wire (filament)
Molybdenum wire possesses unique mechanical strength and corrosion resistance. In comparison to tungsten wire, molybdenum wire is half lighter. That is why it has high strength-to-density ratio. Molybdenum wire differs with high module of elasticity, low coefficient of thermal expansion, ductility, hardness, resistance in aggressive environment. Such advantages allow using it in different spheres of modern industry.
|Temperature of characteristic receiving in °С||20°С|
|Coefficient of linear thermal expansion α [1/°С]||4.9×10−6|
|Specific heat at 20 °C [J/(kg/deg)]||0.256|
|Heat conductivity K [V/m*K]||142|
|Specific electric resistance R Оhm-mm2/m||0.054|
Molybdenum is resistant in cold alkalis, but it slowly fractures in hot alkalis. It can be dissolved in salt or sulfuric acids (t° 80°C). Nitric and chloro-nitric acids dissolve it only after reaching 00 °C. Additives of carbon, oxygen, silicon, aluminium, nitrogen, iron, sulfur, calcium, phosphorus greatly increase its properties. The main part of these additives increases its brittleness. The most detrimental additive is oxygen. If it constitutes 0.0008−0.004%, easy-melting oxides can lead to sharp increase of material brittleness that obstructs metal flow (especially if there are present carbon and nitric). With increasing of oxygen percentage (more than 0.015%), pressure treatment becomes impossible because of brittleness.
Molybdenum relates to rare-earth elements. It is hardly isolated in a pure state.
Besides, it is refractory and hardly processed metal. All these things affect its high self-cost.
Manufacture of molybdenum wire
|Real annealing temperature, ° С||Molybdenum wire diameter|
|1500−1550||200 — 800 µm|
|1450−1500||801 — 1000 µm|
|1400−1450||1001 — 1250 µm|
|1300−1350||1251 — 2500 µm|
Molybdenum wire for filament lamp (GOST 27 266−87)
|Mo grade||Application||Group||Type||Manufacturing accuracy||Diameter of wire|
|MRN||Incoming units, mandrels, center punch at molybdenum helimerization||A||-||Standard||600−2500|
|MoSi0.03||Center punches for manufacture of single-coil filament, rakes, staves and other parts of lamps||A B||K||High, standard||30−2500 15−400|
|MCH||Incoming units, staves, cathodes of gas-discharge devices, lifting beams of special powerful filament lamps||A||-||Standard||200−2500|
|MCH||Center punch that is intended for manufacture of molybdenum double helixes||A||KS||High||45−300|
Molybdenum wire with diameter of up to 0.4 mm can be made in black or dark-grey color. Wire of bigger diameter is usually light-grey. According to technical conditions, marks of oxides, lubricant or other contaminations must not be present on its surface. Surface must be smooth, without cracks and fins. Specifications to molybdenum wire with diameter of more than 0.5 mm are not so rigorous. There is allowed a presence of fins that must meet the specification minimum limits. Standards of rupturing and tensile are noted in special tables. High-quality molybdenum wire can withstand helimerization.
|Molybdenum grade||Ultimate tensile strength (kgf/mm²)||Wire diameter, mm||Group||Ultimate strength limit Gs/mg/200 mm|
|MCH-K||173 163 142||15 — 70 71 — 90 91 — 200||A, B||85 80 70|
|MoSi0.03||121||200 — 500||A||60|
|MCH-KS||152 142 121||45 — 70 71 — 90 91 — 200||A||75 70 60|
Molybdenum wire is resistant in the most aggressive environments, solutions of concentrated alkalis and acids (sulfuric, fluor-hydric, salt). Molybdenum wire possesses a unique mechanical strength, refractory quality, and corrosion resistance. Operational life of molybdenum wire is much higher than in analogous products made of other metals. It is very reliable and durable. It is requested in the most complicated conditions of modern manufacturing and widely applied in nuclear energetics, mechanical engineering, industrial chemistry. It is hard replaceable for manufacture of resistor elements for heating furnaces, illuminating devices, where high heat resistance is required. Piercing molybdenum mandrels are utilized for piercing of steel stainless seamless pipes and for steel drilling. MCH grade is the most popular.
|Molybdenum grade||Group||Wire state||Diameter of wire||Manufacturing accuracy group:||Wire intention:|
|MCH||A||Black||20 — 2500 µm||1.2||Staves, rakes, mandrels, center punches at helimerization|
|MCH||B||Purified||20 — 1000 µm||1.2||Center punches at helimerization, rakes of radio valves|
|MCH||W||Annealed||20 — 1000 µm||1.2||part of electric-vacuum devices|
|MCH||G||Purified, annealed||20 — 1000 µm||1.2||Center punches at helimerization, mandrels|
|MCH||D||Annealed||20 — 1000 µm||1||Center punches at helimerization|
|MRN||A||Black||600 — 2500 µm||1||Center punches at helimerization|
|MRN||B||Annealed||600 — 1000 µm||1||Center punches at helimerization|
|MRN||G||Purified, annealed||600 — 1000 µm||1||Center punches at helimerization|
|MRN||D||Annealed||600 — 1000 µm||1.2||Mandrels|
|MoSi0.03||A||Black||200 — 2500 µm||1.2||Incoming units for brazing with metallized ceramics and refractory glasses; other heat-resistant part|
|MoSi0.03||B||Purified||200 — 1000 µm||1.2||Incoming units for brazing with metallized ceramics and refractory glasses; other heat-resistant part|
|MoSi0.03||B||Annealed||200 — 1000 µm||1.2||Incoming units for brazing with metallized ceramics and refractory glasses; other heat-resistant part|
|MoSi0.03||G||Purified, annealed||200 — 1000 µm||1.2|
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