초록 ▼

A ceramic material includes at least 90% of a single phase silicon aluminum oxynitrite having the general formula: －Si6z Alz N8z Oz － WHERE Z IS GREATER THAN 0 AND LESS THAN OR EQUAL TO 5. One method of producing the ceramic material involves sintering a mixture including not more than 75% by weight

A ceramic material includes at least 90% of a single phase silicon aluminum oxynitrite having the general formula: －Si6z Alz N8z Oz － WHERE Z IS GREATER THAN 0 AND LESS THAN OR EQUAL TO 5. One method of producing the ceramic material involves sintering a mixture including not more than 75% by weight of high active surface area alumina powder of particle size less than 10 microns and silicon nitride powder of particle size less than 20 microns. In another method of producing the ceramic material, a mixture of silicon and alumina powders of particle size less than 20 microns is nitrided at a temperature between 1250°C and 1600°C. The proportions of silicon and alumina in the mixture being nitrided are such that the atomic ratio of silicon to aluminium is not less than 1:3.

대표청구항 ▼

A ceramic material consisting of at least 90% of a single phase silicon aluminum oxynitride having an increased cell dimensioned tetrahedral lattice of B-phase silicon nitride wherein the silicon has been partially replaced by aluminum and the nitrogen has been partially replaced by oxygen. A method

A ceramic material consisting of at least 90% of a single phase silicon aluminum oxynitride having an increased cell dimensioned tetrahedral lattice of B-phase silicon nitride wherein the silicon has been partially replaced by aluminum and the nitrogen has been partially replaced by oxygen. A method of producing a ceramic material comprising: mixing components consisting essentially of not more than 75% by weight of high active surface area alumina in powder form of particle size less than 10 microns, or a compound of aluminum which decomposes to give the required alumina at the elevated temperature of the process, with powdered silicon nitride of particle size less than 20 microns; surrounding the mixture with a protecting medium; and sintering the mixture at a temperature within the range of from 1600°C to 2000°C for at least 30 minutes, the silicon nitride and alumina combining at said temperatures to form a ceramic material consisting of a least 90% of a single phase silicon aluminum oxynitride consisting of a B-phase silicon nitride lattice having increased cell dimensions in which the silicon in the lattice has been partially replaced by aluminum and the nitrogen has been partially replaced by oxygen.