Carbide means,carbonGenerated from elements (except hydrogen) with smaller or similar electronegativityBinary compoundCarbides have high melting points, and most carbides are obtained by the reaction of carbon and metal at high temperatures.From the attribute of the element toMetal carbideandNonmetallic carbide。
Carbides refer to binary compounds formed by carbon and elements with smaller electronegativity or similar electronegativity (except hydrogen). Carbides have higher melting points. Most carbides are produced by the reaction of carbon and metal at high temperatures.
Also called metal carbide, mainly dTransitional element, especially VI B, VII B andFerruginous elementFormed with carbonBinary compound。Its structural characteristics arecarbon atomFilling in dense accumulationMetal latticeIn the tetrahedral cavity ofConductivity。aboutAtomic radiusFor metals larger than 1.3 angstroms, carbon atoms will not deform the metal lattice, onlylatticeTighter and firmer.Carbides of these metals have extremely high melting points and hardness, such asTantalum carbideandTungsten carbideEtc.For metals with atomic radius less than 130pm, carbon atoms deform the original metal lattice, and carbon atomic chains penetrate the deformed metal structure, such as chromium, manganese, iron, cobalt and nickel carbides.The properties of carbides of these metals are between ionic type and interstitial type, with high melting point and hardness. They can also be decomposed by water and acid to generate a mixture of hydrocarbons and hydrogen.
These three types of carbides can be divided into metalsilicon, boron or their oxides at a high temperature of 2000 ℃ with carbon orHydrocarbonsReaction.
