Sintered body of silicon nitride

Details Sintered body of silicon nitride Sintered body of silicon nitride

1990-12-21

1992-06-09

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501 97, 501 98, C04B 3558

Patent

active

051206820

ABSTRACT:
A sintered body of silicon nitride composed of .alpha.'-Si.sub.3 N.sub.4 and .beta.'-Si.sub.3 N.sub.4, the former being represented by the formula Y.sub.x (Si,Al).sub.12 (O,N).sub.16 (where the value of x, which denotes the amount of occluded Y, is in the range of 0<x<0.3), with the value of x for .alpha.'-Si.sub.3 N.sub.4 in the outer part of the sintered body being greater than for .alpha.'-Si.sub.3 N.sub.4 in the inner part of the sintered body. The sintered body will find use as high-temperature structural material owing to its high strength and high toughness.

REFERENCES:
patent: 4506020 (1985-03-01), Butler et al.
patent: 4547470 (1985-10-01), Tanase et al.
patent: 4711644 (1987-12-01), Yeckley et al.
patent: 4818635 (1989-04-01), Ekstrom et al.
patent: 4978645 (1990-12-01), Ukyo et al.

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