Composite ceramic

Details Composite ceramic Composite ceramic

1996-01-30

1997-04-01

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501 95, 501 98, C04B 35596

Patent

active

056165277

ABSTRACT:
A composite ceramic is produced by forming a mixed powder of Si and a compound oxide as the starting material into a formed material, nitriding and firing the formed material to form a sinter, and subjecting the sinter to oxidation treatment. The composite ceramic, which is:lightweight and reduced in heat conductivity, has a specific gravity of at most 2.6, and comprises a phase composed of all of elements Si, O and N, and at least one element selected from the element group consisting of A1, Zr, Li, P and Mg, in which phase a subphase composed of Si, Al, 0 and N and a subphase composed of Si, O and N are formed. Another composite ceramic has pores and a disperse phase in a matrix phase composed of Si.sub.3 N.sub.4 crystal grains, an oxide and an oxynitride, and further comprises coarse Si.sub.3 N.sub.4 grains dispersed in the matrix phase with O-containing boundary reaction product layers formed in the boundaries between the matrix phase and the coarse Si.sub.3 N.sub.4 grains. Thus, this composite ceramic, though reduced in heat conductivity, has a high toughness and a high strength due to dispersion of the coarse Si.sub.3 N.sub.4 grains in the matrix phase.

REFERENCES:
patent: 4987104 (1991-01-01), Trigg
patent: 5110773 (1992-05-01), Corral et al.
patent: 5128285 (1992-07-01), Yokoi et al.
patent: 5145812 (1992-09-01), Arai et al.
patent: 5369065 (1994-11-01), Yoshimura et al.

Affiliated with

Also associated with

Rating

Composite ceramic does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Composite ceramic, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Composite ceramic will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-538680