Application of tungsten and molybdenum materials
Tungsten and molybdenum materials are often used in important applications in different industries because of the following 9 properties.
1) High melting point
2) Extremely low vapor pressure (This is especially important for applications in the refractory and vacuum industries.)
3) High physical strength at high temperatures (for structural parts in high temperature environments)
4) Creep resistance (high temperature load structures Parts. High dimensional stability. Such as: forging molds for large aero-engine turbine blades)
5) High elastic modulus
6) Extremely low thermal expansion coefficient (for metal-ceramic structures, metal-semiconductor structures, metal-graphite structures. The application is very important. For example, in the field of LED, future V-LEDs, which are regarded as high-power LEDs, will use molybdenum or molybdenum copper materials as base materials)
7) Excellent electrical conductivity (metallic properties)
8) Excellent thermal conductivity (Metallic properties)
9) Selective corrosion resistance
A: Application of Tungsten Our most common application of tungsten is probably in the lighting industry. Such as tungsten wire. But in addition to tungsten wire, many people may
not know that tungsten has broader applications in the lighting industry. For example, electrodes of high-power gas discharge lamps, electrodes of short arc lamps, etc.
*Examples of application products in the lighting industry: Short arc lamp electrodes In the semiconductor or electron tube industry, tungsten has a thermal expansion coefficient similar to that of silicon and can improve electron emission performance.
So it is used as electron emitter. In the medical device industry, tungsten is doped with a small amount of rhenium oxide (Re) to improve its high-temperature brittleness and can be used to make
ray targets for X-ray machines (left 1 in the figure below). The radiation shielding ability of tungsten or its alloys can also be used to manufacture radiation shielding/focusing systems for radiotherapy equipment (right 2 in the figure below).
*Information: Applications of tungsten in the medical industry. It is worth mentioning that more than 60% of the world's high-power CT targets (1 on the left) and 100% of the gamma knife shielding/focusing rings (1 on the right, with a blank weight of nearly 2 tons) are provided by PLANSEE.
Tungsten and copper composite materials have large-scale applications in military applications (such as missile balance wings) and high-voltage/UHV power transmission and transformation industries (left 1 in the figure below, high-voltage switch arc contacts, used to break 10KV-1000KV high-voltage lines medium short-circuit current, which requires extremely strong resistance to arc ablation). Composite materials of tungsten and graphite have very important applications in the thermonuclear fusion industry. Information: Applications of tungsten and its composite materials in the power industry. Tungsten can also be used to make heaters and crucibles for quartz glass melting and high-temperature applications due to its high melting point. Sintering furnace liner.
B: Applications of molybdenum
Generally speaking, the properties of molybdenum and tungsten are relatively close, except that molybdenum is cheaper and easier to process than tungsten. In terms of application, molybdenum is also relatively close to tungsten. For example, in the lighting industry, they are used in filament supports and reflective bowls for automotive headlights. Molybdenum tape made by doping CeO2 and Y2O3 is used to make sealing wires in quartz lamp tubes. Make electrodes or structural parts in electron tubes. It is used as the base plate for silicon components in thyristors.
5. Summary In practice, the applications of tungsten and molybdenum materials are much wider than what is introduced in this article. Tungsten can be used in space shuttles, spacecrafts, airplanes, automobiles, electronic equipment, and military weapons. Molybdenum material.