Composite ceramics and their production process

Details Composite ceramics and their production process Composite ceramics and their production process

1992-10-13

1994-11-22

Group, Karl

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

423335, 423345, 501 97, C04B 3554, C04B 3556

Patent

active

053669410

ABSTRACT:
A composite ceramic material that is stable and shows a high strength in the temperature range of room temperature to 1600.degree. C. as well as has a toughness high-enough to be used as structural material and a process for producing it are provided. This composite ceramic material is composed of a matrix substantially made up of Si.sub.3 N.sub.4 and Si.sub.2 N.sub.2 O and a dispersion phase substantially made up of SiC where the matrix contains 0.05% by weight or less of metal element impurities such as Al, Ca and Fe. SiC grains or fibers are dispersed in the dense matrix made up of Si.sub.3 N.sub.4 and Si.sub.2 N.sub.2 O fine grains, which are substantially free from element impurities except Si, C and O. According to one aspect of this invention, this ceramic material is produced by Si.sub.3 N.sub.4 with SiO.sub.2 to form matrix powders that contain 0.05% by weight or less of metal element impurities such as Al, Ca and Fe, mixing and compacting the powders with a SiC dispersion phase to form a compact and firing or sintering the compact under pressure for densification.

REFERENCES:
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patent: 5098449 (1992-03-01), Hwang et al.
patent: 5132257 (1992-07-01), Kodama et al.
patent: 5164346 (1992-11-01), Guinchi et al.
Proceedings of the 23rd Automotive Technology Coordination Meeting, "Mechanical Properties of SiC Fiber-Reinforced Reaction-Bonded Si.sub.3 N.sub.4 Composites" pp. 199-208 (1992) no month.
Proceedings of the 1st International Symposium on the Science of Engineering Ceramics, "SiC-Platelet Reinforcement of Si.sub.3 N.sub.4 Composites", pp. 371-376 (1992) no month.
Zeng et al, "Hot Isostatic Pressing and High-Temperature Strength of Silicon Nitride-Silica Ceramics", Journal of American Ceramic Society, vol. 73(4), 1095-97 (1990) no month.

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