Molybdenum Carbide
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Molybdenum carbide is an extremely
hard Hard means something that is difficult to do. It may also refer to: * Hardness, resistance of physical materials to deformation or fracture * Hard water, water with high mineral content Arts and entertainment * Hard (TV series), ''Hard'' (TV ser ...
,
refractory In materials science, a refractory (or refractory material) is a material that is resistant to decomposition by heat or chemical attack and that retains its strength and rigidity at high temperatures. They are inorganic, non-metallic compound ...
,
ceramic A ceramic is any of the various hard, brittle, heat-resistant, and corrosion-resistant materials made by shaping and then firing an inorganic, nonmetallic material, such as clay, at a high temperature. Common examples are earthenware, porcela ...
material, commercially used in
tool bit In machining, a tool bit is a non-rotary cutting tool used in metal lathes, shapers, and planers. Such cutters are also often referred to by the set-phrase name of single-point cutting tool, as distinguished from other cutting tools such as a s ...
s for cutting tools. There are at least three reported phases of molybdenum carbide: γ- Mo C, β-Mo2C, and γ'. The γ phase is structurally identical to
tungsten carbide Tungsten carbide (chemical formula: ) is a carbide containing equal parts of tungsten and carbon atoms. In its most basic form, tungsten carbide is a fine gray powder, but it can be pressed and formed into shapes through sintering for use in in ...
. β-Mo2C has been suggested as a catalyst for
carbon dioxide Carbon dioxide is a chemical compound with the chemical formula . It is made up of molecules that each have one carbon atom covalent bond, covalently double bonded to two oxygen atoms. It is found in a gas state at room temperature and at norma ...
hydrogenation Hydrogenation is a chemical reaction between molecular hydrogen (H2) and another compound or element, usually in the presence of a catalyst such as nickel, palladium or platinum. The process is commonly employed to redox, reduce or Saturated ...
. The γ' phase forms by combining the elements at relatively low temperatures, and transforms to the γ phase at 800 °C.


References

Carbides Molybdenum compounds Superhard materials Refractory materials {{chem-compound-stub