摘要:
A profiled body of silicon nitride and aluminium nitride dipped in a silica solution such that the silica infiltrates the pores of the body. This silica, together with unconverted silica present in the body, reacts with the aluminium nitride when the body is subsequently fired at around 1800°C in a controlled atmosphere to form sialon. As all the silica is utilised in the reaction, a sialon is formed which can retain its strength up to around 100,000 p.s.i. and at temperatures above 1000 * C. Alternatively, the body is infiltrated with alumina to form sialon when fired to at least 1800°C in a controlled atmosphere.