초록 ▼

This invention relates to sintered ceramic materials in which the densification during sintering takes place with a liquid phase preferably based on silicon nitride. During sintering such materials are often embedded in a powder of inert material such as BN, etc. The invention resides in the fact th

This invention relates to sintered ceramic materials in which the densification during sintering takes place with a liquid phase preferably based on silicon nitride. During sintering such materials are often embedded in a powder of inert material such as BN, etc. The invention resides in the fact that by embedding the material to be sintered in a protective powder with a composition similar to that of the intergranular phase, a surface zone with a composition and/or structure different from that of the core can be obtained.

대표청구항 ▼

Sintered ceramic material based on silicon nitride, silicon oxide, aluminum nitride, aluminum oxide or mixtures thereof, in which the densification during sintering takes place with an intergranular liquid phase, said material comprising a core and a surface zone with a gradual transition in at leas

Sintered ceramic material based on silicon nitride, silicon oxide, aluminum nitride, aluminum oxide or mixtures thereof, in which the densification during sintering takes place with an intergranular liquid phase, said material comprising a core and a surface zone with a gradual transition in at least one of composition and crystal structure between said core and said surface zone.