The Korean Journal of Ceramics

The Korean Ceramic Society (한국세라믹학회)
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Hydrothermal Stability of (Y, Nb)-TZP/$Al_2O_3$ Composites

  • Lee, Deuk-Yong (Department of Metallurgical and Materials Engineering) ;
  • Kim, Dae-Joon (Division of Ceramics, Korea Institute of Science and Technology) ;
  • Lee, Seung-Jae (Department of PWR Fuel Development, Korea Nuclear Fuel Co., Let.)
  • Published : 1999.12.01
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Abstract

Y2O3 and Nb2O5 co-doped tetragonal zirconia polycrystals((Y, Nb)-TZP) containing 10 to 30 vol% $Al_2O_3$ were prepared and hydrothermal stability of the composites was evaluated after aging for 5 h at the temperature range of $150^{\circ}C$ $250^{\circ}C$ under 4 MPa $H_2O$ vapor pressure in an autoclave. The (Y, Nb)-TZP/Al2O3 composites showed excellent phase stability under the hydrothermal conditions, as compared with the 3Y-TZP/$Al_2O_3$ composites, due to the combined effects of the Y-Nb ordering in the $t-ZrO_2$ lattice, the reduction of oxygen vacancy concentration, and the $Al_2O_3$ addition. The strength and fracture toughness of the (Y, Nb)-TZP/$Al_2O_3$ composite, containing 20 vol% of 2.8 $Al_2O_3$ particles, were 700 MPa and 8.1 MP.$am^{1/2}$, respectively.

Keywords

References

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