Cermet or ceramic/glass composites including self-reinforced .be

Details Cermet or ceramic/glass composites including self-reinforced .be Cermet or ceramic/glass composites including self-reinforced .be

1992-09-01

1993-12-14

Group, Karl

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

501 97, 419 13, 419 27, 164103, 164105, C04E 3558

Patent

active

052699897

ABSTRACT:
Infiltrate a porous, self-reinforced .beta.-Si.sub.3 N.sub.4 preform with a metal or a crystallizable glass to yield a composite material. The preform possesses a low glass phase and has a density of from about 50 to about 70 percent of theoretical density. Prepare the .beta.-Si.sub.3 N.sub.4 preform by subjecting a porous body formed from an .alpha.-Si.sub.3 N.sub.4 powder composition to two sequential heat treatments. The first heat treatment occurs below the .alpha.- to .beta.- conversion temperature and results in a strengthened body that can be machined. The second heat treatment occurs above that temperature and yields the self-reinforced .beta.-Si.sub.3 N.sub.4 preform. Conventional infiltration procedures with an infiltrant that is a metal or a glass results in a Si.sub.3 N.sub.4 /metal or Si.sub.3 N.sub.4 /glass composite material that has 50 to 70 percent of its volume occupied by .beta.-Si.sub.3 N.sub.4 whiskers.

REFERENCES:
patent: 2671955 (1954-03-01), Grubel et al.
patent: 3969553 (1976-07-01), Kondo et al.
patent: 4017319 (1977-04-01), Greskovich et al.
patent: 4055451 (1977-10-01), Cockbain et al.
patent: 4072532 (1978-02-01), Fletcher et al.
patent: 4119689 (1978-10-01), Prochazka et al.
patent: 4131459 (1978-12-01), Phillips
patent: 4636480 (1987-01-01), Hillig
patent: 4650592 (1978-03-01), Dobbs et al.
patent: 4657876 (1987-04-01), Hillig
patent: 4661461 (1987-04-01), Brun et al.
patent: 4689189 (1987-08-01), Brun et al.
patent: 4711860 (1987-12-01), Gadkaree et al.
patent: 4730432 (1988-10-01), Minford et al.
patent: 4756754 (1988-07-01), SinghDeo
patent: 4764195 (1988-08-01), Allaire et al.
patent: 4883776 (1989-11-01), Pyzik et al.
patent: 4891345 (1990-01-01), Nadkarni et al.
patent: 4919689 (1990-04-01), Pyzik et al.
patent: 4988645 (1991-01-01), Holt et al.
patent: 5021372 (1991-06-01), Pyzik et al.
patent: 5091347 (1992-02-01), Pyzik et al.
patent: 5098449 (1992-03-01), Hwang et al.
patent: 5118645 (1992-06-01), Pyzik et al.
patent: 5120328 (1992-06-01), Pyzik et al.
patent: 5160508 (1992-11-01), Pyzik et al.

Affiliated with

Also associated with

Rating

Cermet or ceramic/glass composites including self-reinforced .be does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Cermet or ceramic/glass composites including self-reinforced .be, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cermet or ceramic/glass composites including self-reinforced .be will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1702889