Application of molybdenum in electronics and electricity
Molybdenum has good conductivity and high temperature performance, especially with the thermal expansion coefficient of glass is very similar, widely used in the manufacture of molybdenum wire, molybdenum foil, molybdenum processing workpiece spiral filament core wire, lead wire, hook, bracket, side rod and other components, molybdenum wire, molybdenum foil, molybdenum processing workpiece in the vacuum tube to do grid and anode support material. Molybdenum is used as a metal oxide semiconductor gate in large integrated circuits. The bimetallic effect can be eliminated by installing integrated circuits on molybdenum. The ultra-thin seamless molybdenum tube (about 15μm) can be used as the anode support for the picture tube of high definition TV. This kind of TV has up to 1125 picture scan lines, which is two times more than the average TV. Molybdenum wafer can also be used as power transistor heat shield and silicon rectifier base plate and heat sink.
In addition to the use of pure molybdenum in the modern electronics industry, Mo-Re alloy can be used as the structural material of vacuum tube and special light bulb, Mo-5ORe and TZM alloy can also be used as high power microwave tube and millimeter wave tube thermionic cathode structure components, its working temperature can reach 1200℃, and the flow density can reach 10 amps/cm2. As the lead wire, the pure molybdenum wire has a low recrystallization temperature and is prone to embrittlement at high temperature, which influences the service life. In recent years, some people have developed adding Si, k and C elements to improve the recrystallization temperature and produce "high temperature molybdenum pen". By adding rare earth elements in the process of molybdenum oxide production, the recrystallization temperature can be increased more effectively, and the problem of high temperature embrittlement can be overcome. Molybdenum filaments containing 0.1-0.3% zirconium and 0.1% scandium are nitrized at 1200℃ to disperse scandium into the whole alloy. The tensile strength of molybdenum filaments at 20℃ can reach 1400 million Pascals.
The rapid development of die industry, so that EDM technology has been widely used, molybdenum wire is the ideal EDM wire cutting machine tool electrode wire, can cut a variety of steel and hard alloy, processing the shape of extremely complex parts, the discharge processing is stable, can effectively improve the accuracy of the die.
The above are the two most widely used molybdenum wire. The development of light bulb manufacturing industry and the rise of mold manufacturing industry make the production and consumption of molybdenum wire advance by leaps and bounds.
