(Y,Ce)-TzP/Al_2O_3複合体のHIP処理と機械的強度及び水熱条件下の安定性

概要

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Yttria- and ceria-doped tetragonal zirconia ((Y, Ce)-TZP)/Al_20_3 composites were fabricated by HIPping at 1400°to 1600℃ and 147 MPa for 0.5 h in Ar, and their bending strength, microstructure and stability under hydrothermal conditions at 180℃ and 1 MPa were studied. The bending strength of (4Y, 4Ce)-TZP/25 wt%Al_20_3 composites HIPped at 1400℃ was 1600 MPa. The thermal stability of (Y, Ce)-TZP/Al_20_3 composites increased with decreasing HIP temperature, since it depends on the HIP temperature. (4Y, 4Ce)-TZP/25 wt%Al_20_3 composites HIPped at 1400°C showed improved stability under hydrothermal conditions at 180℃ and 1 MPa. The composites treated at 1600℃ showed marked grain growth as compared with 3Y-TZP/Al_20_3 composites, and their bending strength was greatly reduced to less than that of normal sintered bodies. HIPping below 1500℃ in Ar was useful to density the composites and to improve the fracture strength.
社団法人日本セラミックス協会の論文
1991-03-01