Manufacturing method for silicon nitride-based sintered body

Details Manufacturing method for silicon nitride-based sintered body Manufacturing method for silicon nitride-based sintered body

1996-04-29

1998-02-24

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Direct application of electrical or wave energy to work

Producing or treating inorganic material, not as pigments,...

264434, 264332, 264683, 419 13, 501 972, C04B 35584

Patent

active

057209170

ABSTRACT:
The invention aims to offer a method to manufacture a high-strength, high-reliability and low cost silicon nitride based sintered body which is not affected by the amount of metal impurities contained in the silicon nitride powder, without using high-purity silicon nitride powder, and can be sintered for a short sintering time. The invention uses silicon nitride and sintering aids, and the powder mixture containing 500-5000 ppm metal impurities is sintered at temperatures ranging from 1300.degree.-1900.degree. C., and under the conditions wherein the product of sintering temperature and sintering time ranges from 1.times.10.sup.5 to 10.times.10.sup.5 .degree. C. .multidot.seconds.

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