Refractory metal borides, carbides and nitrides, and composites containing them.

摘要

Refractory metal borides, carbides, nitrides and mixtures thereof of the Group IVb, Vb and Vlb metals are produced from a glass or microcrystalline gel formed from organo-metallic precursors. Typically Ti0<Sub>2</Sub>.<Sub>B203</Sub> glass is produced by hydrolysis of titanium butoxide and trimethyl borate, followed by gelling/ drying. The glass may have carbon inclusions or may be mixed with carbon or aluminum powder or a mixture thereof, and reacted. In the case of aluminothermic and carboaluminother- mic reduction, there is a residual aluminum-containing phase in the product. Composites can also be produced by including inert materials in the reaction mixture.