Plastic processing method of pressure or pressureless sintered ceramic body and ceramics-made molded material formed by the method

摘要

There are disclosed a plastic processing method of the pressure or pressureless sintered ceramic body composed of at least one aluminum-containing compound selected from the group consisting of aluminum oxide, aluminum nitride and aluminum oxynitride and at least one hard compound selected from the group consisting of carbides, nitrides and oxides of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten and silicon and mutual solid solutions thereof, the content of said at least one aluminum-containing compound is 5 to 95 % by volume, comprising subjecting the ceramic body to plastic deformation at a temperature of l300 °C or higher, under a stress of l5 kg/mm² or smaller and at a strain rate of l0⁻³/sec or less in a reducing atmosphere or in vacuum, and a ceramics-made molded material comprising a composite ceramic body composed of the same as mentioned above.