Boron nitride-toughened single phase silicon aluminum oxynitride

Details Boron nitride-toughened single phase silicon aluminum oxynitride Boron nitride-toughened single phase silicon aluminum oxynitride

1988-12-21

1999-07-20

Nelson, Peter A.

Compositions: ceramic

Ceramic compositions

Refractory

501 961, 501154, C06B 3558

Patent

active

059255846

ABSTRACT:
Multiphase ceramic composites containing single phase silicon aluminum oxynitride and boron nitride wherein the boron nitride is one phase in the composite and the single phase silicon aluminum oxynitride is the matrix phase in the composite. The boron nitride phase is uniformly distributed in the form of discrete particles throughout the single phase silicon aluminum oxynitride matrix. A window transparent to electromagnetic radiation in a predetermined frequency spectrum is made by forming a homogeneous, finely-divided mixture of boron nitride and single phase silicon aluminum oxynitride matrix-forming compound and compacting the homogeneous, finely-divided mixture at an elevated temperature and pressure for a sufficient time to form the composite. In a preferred embodiment, about 75% by weight homogeneous, finely-divided mixture of single phase silicon aluminum oxynitride matrix-forming compound and the balance boron nitride is densified at a temperature of 1,760.degree. C. and at a pressure of about 3,775 p.s.i. for about 1 hour. The single phase silicon aluminum oxynitride corresponds to the formula: Si.sub.6-x Al.sub.x O.sub.x N.sub.8-x, where x is at least 0.1 and less than or equal to 4.2, and preferably 3 or 4. The single phase silicon aluminum oxynitride matrix is derived from any effective combination of aluminum nitride, silicon nitride, silica and alumina.

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Silica, Boron Nitride, Aluminum Nitride, Alumina Composite, Article and Method of Making Same, Copending U.S. Application Serial No. 287, 233 filed Dec. 21, 1988-Dodds and Tanzilli.

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