What is molybdenum carbide?
Molybdenum carbide has a high melting point and hardness, good thermal and mechanical stability, and excellent corrosion resistance. Molybdenum is a silver-white refractory metal with a melting point of 2615℃ and a density of 10.2g/cm3. Its expansion coefficient is small, almost identical to special glass for electronic tubes. Molybdenum is stable at room temperature and will oxidize rapidly when it is higher than 600℃. React with carbon, hydrocarbon, or carbon monoxide at above 800℃ to generate molybdenum carbide. Molybdenum carbide Mo2C=203.88, containing 5.89% carbon, is a dark gray metallic powder, and its crystal is a close-packed hexagonal lattice with—a density of 9.18g/cm3 and a melting point of 2690℃. As a new functional material with a high melting point and hardness, good thermal and mechanical stability, and excellent corrosion resistance, it has been widely used in various fields, such as high-temperature, abrasion, and chemical corrosion resistance. With electronic structure and catalytic characteristics similar to those of precious metals, it can be widely used as a catalyst for reactions involving hydrogens, such as alkane isomerization, unsaturated hydrocarbon hydrogenation, hydrodesulfurization, and denitrification. It has high hardness, wear resistance, and scratch resistance. It is an important component of molybdenum-molybdenum carbide hard coating and other cermet coatings and can also be used as a wear-resistant and scratch-resistant coating alone.
What is molybdenum carbide used for?
Molybdenum carbide belongs to transition metal carbide, a kind of intermediated compound with metal properties formed by carbon entering the lattice of transition metal. As a new functional material with high hardness, good stability, and corrosion resistance, metal carbide has been applied in various mechanical fields with high-temperature, abrasion, and chemical corrosion resistance.
As an ally of steel, molybdenum, nickel, and chromium can reduce the embrittlement of alloy steel during heat treatment. The United States has taken the lead in solving the shortage of tungsten resources by replacing tungsten with molybdenum in high-speed steel. It is calculated that molybdenum has twice the "capacity" of tungsten. In this way, steel containing 18% tungsten can be replaced by steel containing 9% molybdenum (chromium and vanadium are added simultaneously), which greatly reduces the production cost of steel. The role of molybdenum in stainless steel is to improve corrosion resistance, high strength, and weldability. It can be seen that molybdenum plays an extraordinary role in the iron and steel industry.
Molybdenum and molybdenum alloys not only have high strength, good electrical and thermal conductivity, and low thermal expansion coefficient (similar to that of glass for electronic tubes) but also have the advantage of easier processing than tungsten. Therefore, plates, strips, foils, tubes, rods, wires, and profiles produced by conventional processing methods are used in electronic tubes (grid and anode), electric light source (supporting material) parts, metal processing tools (die casting and extrusion dies, forging dies, punching holes, etc.
Molybdenum has extremely low vapor pressure under a vacuum furnace's working temperature and pressure. Therefore, the molybdenum parts have the least pollution to the workpieces or working substances in the furnace. The evaporation loss will not restrict the service life of high molybdenum parts such as heating elements and heat insulation packages. The high strength of molybdenum in making glass products makes it the ideal electrode, treatment, and processing equipment during rapid heating. Molybdenum is chemically compatible with most glass components, and it will not cause harmful chromogenic effects because a small amount of molybdenum dissolves in the glass bath. As a heating electrode in a glass melting furnace, its service life can be as long as 3 ~ 5 years.
Chemical properties of molybdenum carbide
Molybdenum carbide is a gray hexagonal crystal. It has a high melting point and hardness, good thermal and mechanical stability, and corrosion resistance. The melting point is 2692℃. Insoluble in water and alkali, slightly soluble in nitric acid, sulfuric acid, and hydrofluoric acid.
The price of molybdenum carbide
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molybdenum carbide supplier
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