Compositions: ceramic – Ceramic compositions – Refractory
Patent
1994-09-09
1996-03-26
Group, Karl
Compositions: ceramic
Ceramic compositions
Refractory
501 98, C04B 35587, C04B 35599
Patent
active
055020119
ABSTRACT:
A silicon nitride sintered body characterized by comprising crystal grains having a linear density of 60 to 120 per 50 .mu.m length as measured in an arbitrary two-dimensional section of the sintered body. The silicon nitride sintered body has a shock compressive elasticity limit (Hugoniot-elastic limit) of 15 GPa or more and is substantially composed of crystal phases of .alpha.-silicon nitride and .beta.'-sialon. The percentages of the .alpha.-silicon nitride and .beta.'-sialon are not more than 30% and not less than 70%, respectively. The silicon nitride sintered body is particularly excellent in mechanical strengths at room temperature as well as in productivity and cost efficiency and is useful for applications as the material of parts where a particularly high impact strength is required, such as a valve train mechanism for automobile parts.
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Chemical Abstracts, vol. 114, No. 24, Abstract 233516k, Mashimo et al, "Yielding Characteristics of Silicon Nitride Ceramics Under Shock Compression", (1990).
Matsunuma Kenji
Nishioka Takao
Yamakawa Akira
Yamamoto Takehisa
Bierman Jordan B.
Group Karl
Sumitomo Electric Industries Ltd.
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