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Ceramic body of zirconium dioxide (ZrO.sub.2) and method for its preparation

  • US RE32,449 E
  • Filed: 01/23/1986
  • Issued: 06/30/1987
  • Est. Priority Date: 06/16/1983
  • Status: Expired due to Fees
First Claim
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1. In a ceramic body of zirconium dioxide or zirconium dioxide containing aluminum oxide, the improvement comprising said ceramic bodybeing partially stabilized with 0.5 to 5 mole-% of yttrium oxide, 5 to 15 mole-% magnesium oxide, calcium oxide, 5 to 15 mole-% cerium oxide, 5 to 15 mole-% of one or more rare earth dioxides or 5 to 15 mole-% of a combination thereof;

  • being 30 to 100% in the tetragonal lattice modification; and

    having, in the surface region, a content of yttrium oxide, cerium dioxide, magnesium oxide, calcium oxide or rare earth oxide that is 2 to 20 mole-% higher than the average content in said ceramic body, such that the body is covered with a thin layer of a more highly stabilized tetragonal lattice form or one predominantly in the cubic lattice form.

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