High-strength and temperature-change resistant ceramic formed body, especially of mullite, its production and use

摘要

A ceramic formed body having high temperature change resistance and strength and being composed of a ceramic matrix with dispersed particles of ZrO. sub.2, HfO.sub.2, or mixture thereof, is formed of a powdered ceramic material which is a precursor to the matrix material of the ceramic matrix, mixed with a compound which can form ZrO. sub.2, HfO.sub.2 or mixture thereof upon reaction with the ceramic material, and thereafter densely sintered below the reaction temperature. The sintered body is then heat treated above the reaction temperature to convert the precursor ceramic material into the matrix material and form the ceramic body with in situ formation of the dispersed particles.