In the lighting industry, tungsten and molybdenum are widely used in key components of various light sources due to their high melting points, excellent high-temperature stability, and electrical/thermal conductivity.
Applications of tungsten in the lighting industry:
Incandescent lamps/halogen lamps: Spiral filaments made of pure tungsten or doped tungsten (such as thorium-tungsten, lanthanum-tungsten).
Gas discharge lamps: Tungsten or tungsten-rhenium alloy anodes are used in xenon lamps, metal halide lamps, high-voltage xenon lamps, film projection lamps, etc.
Special lighting: High-temperature furnace lamps and infrared heating lamps use tungsten filaments or tungsten strips as heating elements to radiate infrared rays.
Applications of Molybdenum in the lighting industry:
Halogen lamps/high-intensity discharge lamps (HID)
Used as filament supports and lead wires (due to its thermal expansion coefficient close to that of tungsten, which avoids thermal stress fracture).
LED packaging
Heat dissipation substrates: High-power LEDs adopt molybdenum-copper alloy (Mo-Cu) or molybdenum-aluminum substrates, utilizing molybdenum's high thermal conductivity (138 W/m·K) for heat dissipation.
Vacuum electronic devices
Electrodes and seals: Molybdenum foils are used in ceramic-to-metal sealing (such as sodium lamps and UV lamps), featuring high temperature resistance and good airtightness.
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