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High-strength zirconia type sintered body

  • US 4,587,225 A
  • Filed: 10/17/1984
  • Issued: 05/06/1986
  • Est. Priority Date: 10/17/1983
  • Status: Expired due to Term
First Claim
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1. A hot isostatically pressed zirconia type sintered body consisting essentially of 50 to 98% by weight of ziroconia (ZrO2) containing 1.5 to 5 mole % of yttria (Y2 O3) and 50 to 2% by weight of alumina (Al2 O3), spinel (MgAl2 O4) or mullite (3Al2 O3 ·

  • 2SiO2), said hot isostatically pressed sintered body having a three-point bending strength of at least 1700 MPa,the crystal phase of zirconia constituting the sintered body being substantially composed of a tetragonal crystal or a mixture of at least 50% of a tetragonal crystal and up to 50% of a cubic crystal,said sintered body having having a bulk density of at least 99.5% of the theoretical density and devoid of pores having a size of 30 μ

    m or more, andthe crystal of said sintered body having an average grain size of not larger than 2 μ

    m.

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