Tungsten and molybdenum materials often find important applications in different industries because of the following 9 properties.

1) High melting point

2) Very low vapor pressure (this is especially important for refractory and vacuum industry applications).

3) High temperature physical degree (for structural parts in high temperature environment)

4) Creep resistance (high temperature load structural parts. High dimensional stability. Such as: large aircraft engine turbine blade forging die.

5) High elastic modulus

6) Very low coefficient of thermal expansion (important for the application of metal-ceramic structure, metal-semiconductor structure, metal-graphite structure. For example, in the field of LED, V-LED, which is seen as the future of high-power LED, will use molybdenum or molybdenum-copper material as the base material)

7) Excellent electrical conductivity (metal characteristics)

8) Excellent thermal conductivity (metal characteristics)

9) Selective erosion resistance

A: The most common use of tungsten is probably in the lighting industry. Such as tungsten wire. But other than tungsten, a lot of people might just

Tungsten and molybdenum products

I didn't know that tungsten had a wider application in the lighting industry. For example, high power gas discharge lamp electrode, short arc lamp electrode and so on.

Tungsten is used as an electron emitter in the semiconductor or electron tube industry because it has a similar coefficient of thermal expansion to silicon and improves electron emission performance. In the instrument industry, tungsten is improved by mixing small amounts of rhenium oxide (Re) to make X-ray targets. Ray shielding/focusing for radiotherapy equipment can also be made using tungsten or its alloys for ray shielding.

Tungsten application in industry. It is worth mentioning that more than 60% of the high-power CT targets and gamma knife shielding/focusing rings were supplied by PLANSEE.

Tungsten and copper composites have large gauge mode applications in military applications (such as balance wings) and HV/UHV transmission and transformation industries (1 left of the figure below, high voltage switch arc contacts, used to break short circuit current in 10KV-1000kV high voltage lines, requiring extreme arc erosion resistance). Tungsten and graphite composites have important applications in the thermonuclear fusion industry. Tungsten and its composite materials in the power industry also because of its high melting point can be used to make quartz glass melting heaters and crucible and high temperature sintering furnace liner.

B: The application of molybdenum

In general, molybdenum and tungsten are similar in nature, but molybdenum is cheaper and easier to process. Molybdenum is also close to tungsten in application. For example, in the lighting industry, reflective bowls are used for filament supports and car headlights. Molybdenum strip made by mixing CeO2 and Y2O3 is used as sealing lead in quartz lamp tube. To make electrodes or structural components in an electron tube. A Base plate used as a silicon component in a thyristor.

5. Summary In practice, the application of tungsten and molybdenum materials is far more extensive than what is introduced in this paper. No matter in space shuttle, spacecraft, aircraft, automobiles, electronic equipment, military weapons, tungsten and molybdenum materials can be used. Due to short time and space constraints, only a few things can be missed here. Due to limitations and personal knowledge, the article inevitably has fallacies, but also ask for advice.