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Method for producing composite sintered body of silicon carbide and silicon nitride

  • US 5,785,922 A
  • Filed: 11/16/1995
  • Issued: 07/28/1998
  • Est. Priority Date: 11/21/1994
  • Status: Expired due to Fees
First Claim
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1. A method for producing a composite sintered body of silicon carbide and silicon nitride, comprising the steps of:

  • (a) adding sintering aid powder, boron powder and carbon powder to a mixture of 15-50 weight % of silicon carbide powder and 85-50 weight % of silicon nitride powder to form a green body, said sintering aid powder being a mixture of (i) aluminum oxide or aluminum nitride, and (ii) at least one oxide of an element selected from the group consisting of Y2 O3, Yb2 O3, Er2 O3, ZrO2 and HfO2, with a weight ratio of said (i) to said (ii) being from 2;

    1 to 1;

    15, and(b) subjecting said green body to a HIP sintering at an atmosphere gas pressure of 1033-2000 kgf/cm2.

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