What is Molybdenum Carbide?
Molybdenum Carbide, the chemical formula is MoC, and the molecular weight is 107.95.
It has the characteristics of high melting point and hardness, good thermal and mechanical stability, and good corrosion resistance.
Molybdenum Carbide is a gray hexagonal crystal. It has the characteristics of high melting point and hardness, good thermal and mechanical stability, and good corrosion resistance. The melting point is 2692°C. Insoluble in water and lye, slightly soluble in nitric acid, sulfuric acid and hydrofluoric acid.
The application of Molybdenum Carbide,:
1. Molybdenum alloy
TZM alloy has excellent high strength and comprehensive properties, and is the most widely used molybdenum alloy. The United States uses TZM alloy to make turbine disks for engines, and the amount of molybdenum used accounts for 15% of the total amount of molybdenum. my country produces no less than 22 grades of molybdenum materials, including TZM molybdenum alloys. In the early 1990s, my country's output of molybdenum and molybdenum products was nearly 200 tons.
The high mechanical properties of TZM and TZC molybdenum alloys are better than pure molybdenum, and they are widely used in the manufacture of high-tech, molds and various structural parts. As early as the 20th century, my country has successfully made them into various seamless steel pipe thermal perforated plugs. This kind of sintered molybdenum plug made by powder metallurgy technology reduces the consumption of raw materials (50% of the as-cast state), and the average service life is increased by 1.5 to 2 times.
The seamless tube made of molybdenum-rhenium alloy (containing 50% Re) has excellent high performance and can be used at a temperature close to its melting point. It can be used as the bracket, ring, grid and other parts of thermowell and electron tube cathode.
Molybdenum and molybdenum alloys not only have high strength, good electrical and thermal conductivity and low thermal expansion coefficient (similar to electron tube glass), but also have the advantage of being easier to process than tungsten. Therefore, plates, strips, foils, Tubes, rods, wires and profiles, etc. are used in electronic tubes (grid and anode), electric light source (support material) parts, metal processing tools (die-casting and extrusion dies, forging dies, perforated plugs, liquid metal screens) and turbine discs, etc. Widely used in components.
2. Alloying elements of steel
As an ally of steel, molybdenum, together with nickel and chromium, as an alloying element can reduce the embrittlement that often occurs in alloy steels during heat treatment. Using molybdenum to replace tungsten in high-speed steel is leading the way in solving the shortage of tungsten resources. According to calculations, molybdenum has twice the "capacity" of tungsten. In this way, the steel containing 18% tungsten can be replaced by the steel containing 9% molybdenum (chromium and vanadium are added at the same time), which greatly reduces the production cost of steel. The role of molybdenum in stainless steel is to improve corrosion resistance, increase high strength and improve weldability. It can be seen that molybdenum plays an extraordinary role in the steel industry.
3. other apps
Molybdenum has a very low vapor pressure under the working temperature and pressure of the vacuum furnace. Therefore, the molybdenum parts have the least pollution to the workpieces or working materials in the furnace, and the evaporation loss will certainly not restrict the service life of high molybdenum parts such as heating elements and heat insulation encapsulation.
The high strength of molybdenum in the manufacture of glass products makes it the most ideal electrode and processing and processing equipment during rapid heating. Molybdenum is chemically compatible with most glass components, and will not cause harmful color effects due to a small amount of molybdenum dissolved in the glass melting tank. As a heating electrode in a glass melting furnace, its life span can be as long as 3 to 5 years.
4. Emerging applications
The main way to solve the problem of low ductility and high oxidation of molybdenum is to develop an advanced composite material based on molybdenum disilicide (MoSi2).
Due to the excellent characteristics of Molybdenum Carbide, in electrical, thermal and mechanical properties, it is widely used in the field of advanced composite material.
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