PURPOSE: To obtain the titled sintered material having high stability and excellent high-temperature strength and toughness and useful as a valve for high- pressure fluid, by arranging a ceramic layer at the surface and a specific composite layer at the inner side, forming the arranged material and sintering the product in an oxygen-free atmosphere with a hot press etc.
CONSTITUTION: A simple ceramic layer (A) composed of a matrix phase 1 of a ceramic and having a working surface thickness (t) of 1W40% of the total thickness (T) is prepared from a compound selected from SiC, Si3N4, sialon, ZrO2 and Al2O3. An inner composite layer (B) is produced by dispersing a dispersoid 2 selected from one or more kinds of particles and one or more kinds of whiskers or fibers of simple metal, metal carbide, metal nitride, metal silicide and metal boride in a ceramic same as the matrix of the layer A. The layers A and B are arranged, formed and sintered in an oxygen-free atmosphere under heating to obtain a high-strength sintered composite ceramic material having excellent corrosion resistance and exhibiting high toughness even if cracks 3 are generated.
IIJIMA SHIRO
SATO KOJI
KITAZAWA CHOSHIRO
| JPS59156970A | 1984-09-06 | |||
| JPS6345190A | 1988-02-26 | |||
| JPS55113680A | 1980-09-02 | |||
| JPS5895648A | 1983-06-07 | |||
| JPS6246965A | 1987-02-28 |
Next Patent: SINTERED COMPOSITE CERAMIC MATERIAL AND PRODUCTION THEREOF