Method of making in-situ grown whisker reinforced ceramics

Details Method of making in-situ grown whisker reinforced ceramics Method of making in-situ grown whisker reinforced ceramics

1995-04-18

1996-12-17

Group, Karl

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

501 97, 264 65, 264 66, C04B 35577, C04B 35596

Patent

active

055853145

ABSTRACT:
In-situ Si.sub.3 N.sub.4 whisker growth mechanisms have enhanced the microstructure of ceramic materials such as SiC through controlled growth of elongated beta-type Silicon Nitride grains. During liquid phase sintering at temperatures not exceeding 1850.degree. C., alpha-type Silicon Nitride dissolves into the liquid phase and reprecipitates as an elongated or acicular beta modification. The Si.sub.3 N.sub.4 reinforced microstructures can be formed by the controlled recrystallization of beta-type Silicon Nitride. In-situ whisker growth is enhanced or optimized through the use of thermal treatments and/or additions of seed materials. Finely divided beta-type Silicon Nitride particles which are insoluble in the liquid phase during sintering, and therefore have been used to provide nucleation sites for whisker growth are employed. Thermal treatments have been designed to promote directional growth (elongation) as opposed to development of less elongated type grains.

REFERENCES:
patent: 4863881 (1989-09-01), Ahrens et al.
patent: 5118645 (1992-06-01), Pyzik et al.
patent: 5132257 (1992-07-01), Kodama et al.
patent: 5160508 (1992-11-01), Pyzik et al.
patent: 5196386 (1993-03-01), Furuse et al.
patent: 5200373 (1993-04-01), Yasutomi et al.
patent: 5358912 (1994-10-01), Freitag et al.

Affiliated with

Also associated with

Rating

Method of making in-situ grown whisker reinforced ceramics does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of making in-situ grown whisker reinforced ceramics, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of making in-situ grown whisker reinforced ceramics will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1990953