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Process for producing fiber-reinforced silicon carbide composites

  • US 6,576,076 B1
  • Filed: 02/17/2000
  • Issued: 06/10/2003
  • Est. Priority Date: 03/01/1999
  • Status: Expired due to Fees
First Claim
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1. A process for producing a fiber-reinforced silicon carbide composite, said process comprising the steps of:

  • laminating first fiber prepregs containing resin and second fiber prepregs containing silicon powder and resin, in alternate order;

    molding the laminate into a desired shape to yield a green body;

    carbonizing the green body at a temperature in the range of about 900°

    C. to about 1350°

    C. in an inert atmosphere to yield a carbonized composite;

    subjecting the carbonized composite to reaction sintering at a temperature of about 1300°

    C. or higher in vacuo or in an inert atmosphere to form open pores in a fiber region containing silicon powder; and

    infiltrating molten silicon into the open pores of the sintered composite at a temperature in the range of about 1300°

    C. to about 1800°

    C. in vacuo or in an inert atmosphere.

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