×

Method of forming a ceramic product

  • US 4,987,104 A
  • Filed: 11/01/1988
  • Issued: 01/22/1991
  • Est. Priority Date: 03/14/1986
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method of forming a ceramic product by converting silica to silicon nitride in a carbothermal reduction process in the presence of nitrogen, fabricating the silicon nitride into the desired shape of the ceramic product and sintering the fabricated silicon nitride, characterised in that the carbothermal reduction process is partially completed so as to produce a mixture comprising residual silica and silicon nitride which is fabricated into the desired shape and is heated in a densification step in a nitrogen atmosphere at a temperature of from 1400°

  • C. to 2000°

    C. to produce a ceramic product comprised of silicon nitride and silicon oxynitride.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×