Silicon nitride sintered body

Details Silicon nitride sintered body Silicon nitride sintered body

1998-08-27

1999-07-06

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

C04B 35587

Patent

active

059197196

ABSTRACT:
A silicon nitride sintered body containing a .beta.-silicon nitride crystal phase and further containing at least a rare earth element component and an aluminium component in a grain boundary phase, wherein the intensity ratio (X2/X1) of the Si peak X.sub.2 at 521 cm.sup.-1 to the Si.sub.3 N.sub.4 peak X.sub.1 at 206 cm.sup.-1, as detected by a Raman spectrochemical analysis method, is 0.2 to 3. A very minor amount of Si (elemental silicon), as detected by the Raman spectrochemical analysis method, is precipitated in the sintered body, and by this precipitation of Si, strength and toughness are markedly increased.

REFERENCES:
patent: 4891342 (1990-01-01), Yokoyama
patent: 4944930 (1990-07-01), Holt et al.
patent: 5126294 (1992-06-01), Hirosaki et al.
patent: 5756411 (1998-05-01), Nakahata et al.

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