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Strengthening of Y-PSZ-Al2O3 composite ceramics.

1990; Volume: 37; Issue: 2 Linguagem: Inglês

10.2497/jjspm.37.357

1880-9014

Ryōichi Shikata, Yoshinori Urata, Takeshi Shiono, Tomozo NISHIKAWA,

Powder Metallurgy Techniques and Materials

Zirconia raw powder containing 2 or 3 mol% of Y2O3 prepared by a hydrolytic precipitation method and Al2O3 raw powder were mixed with ethanol using a pot-mill. The homogeneously mixed powder was mold-pressed at 35 MPa, and then, it was further isostatically pressed at 98 MPa. The moldings were sintered at 1300°-1600°C for 3 hr in air, and these densely sintered bodies were isostatically hot-pressed at 1450°or 1550°C for 1 hr in Ar under a pressure of 98 MPa.An addition of 20-40 wt% of Al2O3 to Y-PSZ was remarkably effective for the enhancement of the fracture strength of the obtained composite ceramics to give the average bending strength about 3GPa. The fabrication conditions which produced the composite ceramics with high strength and their microstructural features were discussed in this paper.