Calcium carbide, chromium carbide, tantalum carbide, vanadium carbide, zirconium carbide, and tungsten carbide (Figure: jewelry) are all metal carbides. Boron carbide, silicon carbide and the like belong to non-metallic carbides.
From the carbide bond type is divided into ionic carbides, covalent carbides and metal carbides.
Ionic carbides, such as calcium carbide and strontium carbides, hydrolyze with water to produce acetylene and methane, respectively.
Covalent carbides, such as silicon carbide, boron carbide, etc., are atomic crystals, neither with water nor with nitric acid, and have a high hardness, and can be used as abrasive powders and refractories. As for methane and other hydrocarbons, their crystals are molecular crystals, which are already organic compounds and are usually not included in carbides.
Metal carbides are mostly transition metal carbides. Many have metallic luster, conductivity, and high melting point, hardness information source
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