Finely divided tungsten carbide prepn. - by reacting tungsten oxide and carbon monoxide below sintering or agglomerating temps (NL150676)

摘要

Finely-divided WC is prepd. by reacting WO3, with CO. The CO is pref. passed over WO3 particles. Reaction mixt. is heated to a temp. at which CO and WO3 react and WC is formed, but which is below temp. causing caking or sintering together of W-contg. matls. WC is used as an abrasive, in powder metallurgy, and can be re-converted to WO3 of smaller particle size and higher active surface than starting matl. by heating in air at a low temp. WC obtd. has small particle size, pref. 100 angstroms and active surface is approx. =20 m2/g.