The application of molybdenum wire in the optoelectronic industry
In traditional incandescent lamps and halogen lamps, molybdenum wires have been used as support wires or hooks for tungsten filament cores in incandescent lamps due to their high-temperature resistance (melting point 2623°C) and low coefficient of thermal expansion, preventing the filament from deforming or breaking at high temperatures. In addition, in halogen lamps, molybdenum wire is used to connect the filament with the sealing part of the external wire. Because its coefficient of thermal expansion is close to that of quartz glass, it can reduce the sealing force.
In special gas discharge lamps, the application of molybdenum wire is more concentrated. It is used as the electrode lead for gas discharge lamps such as high-pressure sodium lamps and metal halide lamps. It can withstand the erosion of high-temperature arcs, but usually needs to be combined with tungsten or ceramics to extend its service life. Furthermore, in ceramic metal halide lamps, molybdenum foil or molybdenum wire serves as the transitional material for metal-ceramic sealing, taking advantage of its compatibility with alumina ceramics. However, due to the high technical threshold, its application scope is relatively narrow.
With the development of LED technology, molybdenum wire also has some potential applications in LED lamps. Molybdenum-copper alloy (reinforced with molybdenum wire) is used as the heat dissipation substrate for high-power LED chips due to its high thermal conductivity and low coefficient of thermal expansion. However, it is relatively expensive and is currently only found in high-end lighting equipment. In addition, a very small number of high-reliability LED packages use molybdenum wire as the soldering material (as an alternative to gold wire), but due to its poor electrical conductivity, it has not yet become a mainstream application.
The application of molybdenum wire in the lighting industry is restricted by many factors. The popularization of LED technology has reduced the demand for high-temperature materials, while tungsten filaments still dominate in traditional lamps. Molybdenum wire is not widely used in the lighting industry. It is mainly concentrated in traditional halogen lamp sealing components, electrodes of special gas discharge lamps, and a small number of high-end LED heat dissipation substrates.
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