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Analysis of Molybdenum Carbide

wallpapers News 2021-12-09
Molybdenum carbide is a compound composed of metallic molybdenum and non-metallic carbon. The chemical formula is MoC, the molecular weight is 107.95, and the crystal is a close-packed hexagonal lattice. Because of its good thermodynamic and electrochemical properties, it is widely used in various high-temperature resistance. , Friction and radiation resistance and other fields.
1. Physical and chemical properties
Molybdenum carbide is a gray powder with a melting point of 2692°C, insoluble in water and lye, and slightly soluble in nitric acid, sulfuric acid, and hydrofluoric acid. It has the characteristics of high melting point, high hardness, good thermal stability, mechanical stability, wear resistance, and corrosion resistance. In addition, MoC has an electronic structure and catalytic properties similar to precious metals. The main types of catalytic reactions include hydrogenation hydrogenolysis reaction, isomerization reaction, hydrodesulfurization reaction, hydrodenitrogenation reaction, ammonia synthesis reaction, hydrocarbon conversion and Synthesis reaction.
2. Production method
1) Direct synthesis method: use metal molybdenum and carbon as raw materials, then dry-mix it with a ball mill, fully mix it, press and shape it and place it in a heated graphite pan to initially generate Mo2C, and continue to react at high temperature to generate MoC. Chemical reaction formula: 2Mo+C=Mo2C; Mo+C=MoC.
2) Propanol reduction method: Put molybdenum oxide into the reaction furnace, then continue to pass in the mixed gas of propanol vapor and argon, and control the temperature of the reaction furnace, so that the molybdenum oxide is carbonized in the furnace until carbonization is obtained Molybdenum: After the reduction and carbonization treatment is completed, continue to pass argon into the reaction furnace, so that the products after cooling to room temperature are all MoC.
3. Application
1) Production of molybdenum alloys. Molybdenum-zirconium-titanium alloy and molybdenum-titanium-zirconium-carbon alloy are widely used in electronic tubes, electric light source parts, metal processing tools and turbine discs due to their high strength, good electrical and thermal conductivity and low thermal expansion coefficient.
2) Used as an additive for steel. The role of molybdenum in stainless steel is to improve the corrosion resistance, strength and weldability of the product.
3) As the heating electrode in the glass melting furnace. Molybdenum has good compatibility with most glass components and will not produce harmful substances due to a small amount of molybdenum dissolved in the glass melting tank

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