Rodica Silvia Hida

US Patent:

52216470, Jun 22, 1993

Filed:

Dec 11, 1991

Appl. No.:

7/805081

Inventors:

George T. Hida - Amherst NY
Rodica S. Hida - Amherst NY

Assignee:

Benchmark Structural Ceramics Corporation - Amherst NY

International Classification:

C04B 3558

US Classification:

501 98

Abstract:

A precursor material is disclosed. This precursor material is comprised of at least about 16 weight percent of beta-sialon, from about 54 to about 28 weight percent of alumina, from about 0 to about 8 weight percent of aluminum nitride, from about 0 to about 25 weight percent of silicon nitride, and from about 30 to about 24 weight percent of free silicon.

US Patent:

51927209, Mar 9, 1993

Filed:

Jun 27, 1991

Appl. No.:

7/722104

Inventors:

George T. Hida - Amherst NY
Rodica S. Hida - Amherst NY
Cezar C. Delcea - Cheektowaga NY

Assignee:

Benchmark Structural Ceramics Corporation - Amherst NY

International Classification:

C04B 3558

US Classification:

501 98

Abstract:

A process for heat-treating a composite material is disclosed. The composite material contains alumina, free silicon, and a beta-sialon material of the formula Si. sub. 6-z Al. sub. z O. sub. z N. sub. 8-z, wherein z is from 2. 5 to 3. 5. In the heat treatment process, the composite material is subjected to temperatures of 800-1,000 degrees centigrade, 1,240 to 1,260 degrees centigrade, and 1,400 to 1,450 degrees centigrade for various times and under specified conditions.

US Patent:

50306006, Jul 9, 1991

Filed:

Jun 7, 1990

Appl. No.:

7/535035

Inventors:

George T. Hida - Amherst NY
Rodica S. Hida - Amherst NY

Assignee:

Benchmark Structural Ceramics Corp. - Amherst NY

International Classification:

C04B 3558

US Classification:

501 98

Abstract:

A novel composite mateial consisting of at least 70 weight percent of single-phase beta sialon and at least 20 weight percent of alpha-alumina is disclosed. The beta-sialon is of the formula Si. sub. 6-z Al. sub. z -. sub. z N. sub. 8-z, wherein z is from 2. 5 to 3. 5. The composite material contains no silicon nitride. Sintered products made from such composite material contain no glassy phase, contain no silicon nitride, and have superior thermal and mechanical properties.

US Patent:

54532329, Sep 26, 1995

Filed:

Apr 26, 1994

Appl. No.:

8/170194

Inventors:

George T. Hida - Amherst NY
Rodica S. Hida - Amherst NY
Cezar C. Delcea - Cheektowaga NY

Assignee:

Benchmark Structural Ceramic Corporation - Cheektowaga NY

International Classification:

C04B 3510
C04B 3558

US Classification:

264 65

Abstract:

A composition containing at least 70 weight percent of a beta-prime sialon compound and at least about 27 weight percent of a solid solution is disclosed. The solid solution contains from 2 to 50 weight percent of alpha silicon nitride, from 0. 5 to 14 weight percent of aluminum nitride, and from 97. 5 to 36 weight percent of alpha alumina.