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Development History and Application of High Temperature Molybdenum Wire (Rod)
Molybdenum is commonly used in the production of electric light sources, mainly molybdenum wire, molybdenum rod, molybdenum foil, etc.
For a long time, there has been a problem of brittle fracture of pure molybdenum wire bulb lead wires in the lamp industry. The cracking of pure molybdenum wire in the cutting and flattening process can be solved by improving the quality of molybdenum wire, heat treatment and improving processing conditions. However, the embrittlement of pure molybdenum wire lead wires after the quartz glass bulb shell is sealed at a high temperature of more than 1800°C by hydrogen-oxygen flame is an essential problem of the material. If ordinary pure molybdenum wire is heated above the recrystallization temperature, it loses ductility and becomes brittle. Because pure molybdenum wire is non-oriented equiaxed grains in the recrystallization state (equiaxed grains are a crystal form. During the crystallization process of a material, crystals or grain structures that are equally developed in all crystal axis directions) have low grain boundary strength. Therefore, pure molybdenum wire components are often brittle when used above the recrystallization temperature, which creates difficult-to-solve difficulties for lamp factories.
High-temperature molybdenum (HTV), first studied by Planci Metals of Austria, has been put into commercial production. Due to the unique excellent properties of high-temperature molybdenum, it has attracted the attention of Japan, the United States, France and other countries, and has successively carried out research on high-temperature molybdenum.
In view of the long-term brittle fracture of pure molybdenum wire lead wires in the production of special bulbs, Shanghai Iron and Steel Research Institute and Zhuzhou Cemented Carbide Factory in China have successfully developed a new type of high-temperature molybdenum wire (GHM) with excellent performance by adopting a unique doping process and a series of processing. This high-temperature molybdenum wire presents an elongated, oriented and interlocked grain structure in the crystallized state, so that it can maintain high strength and good ductility. It still does not become brittle after high-temperature annealing at 1900℃ and maintains good bending plasticity. Therefore, high-temperature molybdenum wire effectively overcomes the disadvantage of brittle fracture of pure molybdenum wire components after high-temperature treatment.
This new material has been actually used by many lamp manufacturers in halogen tungsten lamps, gas discharge lamps, special lamps and other types, proving that high-temperature molybdenum wire has excellent performance, reduces the loss and cost of bulbs, and improves the quality level.
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