Tungsten carbide (chemical formula WC) is the compound made up of tungsten and carbon, following will show the preparation procedure. The molecular formula is WC and the molecular weight is 195.85, which is black hexagonal crystal with metallic luster and has similar hardness to diamond. It is a good conductor of electricity and heat.
WC is insoluble in water, hydrochloric acid and sulfuric acid, but easily soluble in the mixed acid of nitric acid and hydrofluoric acid. Pure WC is fragile, if a small amount of titanium, cobalt and other metals are doped to it, the brittleness will be reduced. The WC used as steel cutting tool is often added with titanium carbide, tantalum carbide or their mixture to improve the anti explosion ability, the chemical property of WC is stable, and WC powder is used as cemented carbide production material.
Preparation procedure:
1.0 Mix 200 mg ammonium tungstate with 800 mg melamine (mass ratio 1:4), and put the mixture into quartz tube, heat to 800℃ at the rate of 3℃ per minute in argon atmosphere for 3h, and then naturally cool to room temperature.
2.0 At the same time, to understand the relationship between the research structure and the electrochemical catalytic output, the following methods can also be used for production:
2.1 The proportion of ingredient structure remains unchanged, the mass ratio of ammonium tungstate and melamine is still 1:4, and the heat treatment temperature is set at 700, 900 and 1000℃;
2.2 Keep the heat treatment temperature at 800℃, adjust the ratio of raw materials, that is, the mass ratio of ammonium tungstate and melamine is 1:2 and 1: 8.
The hardness of tungsten carbide is close to that of diamond, it can cut iron and various ores. It is widely used in the components producing of cutting machinery, at the same time because of its good wear resistance, it can be used as raw material for bit manufacturing. Recent study has shown that WC has catalytic performance similar to periodicity of metal element, the periodicity is next below to that of tungsten and molybdenum, WC can be widely used in industrial reactions and has important research value.
