中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 10 No. 2 April 2000 |
（1. Department ofNonferrous Metallurgy,
Central South University of Technology, Changsha 410083, P.R.China;
2. IRC in Materials, University ofBirmingham, Elms Road, Birmingham B152TT, UK
Abstract:A zirconia-alumina powder with a near spherical shape and an average size of 0.1~0.2μm was prepared by co-precipitation. XRD analysis shows thatα-Al2O3phase may be directly transformed from amorphous in calcining the hydroxide composite. The ZrO2-Al2O3composite ceramics manufactured from this powder has the maximum fracture toughness of 9MPa·m-1/2at 15% ZrO2and 740MPa fracture strength at 5% ZrO2. Zirconia grains about 1μm in diameter are dispersed uniformly in the alumina ceramic matrix.）
Abstract:A zirconia-alumina powder with a near spherical shape and an average size of 0.1~0.2μm was prepared by co-precipitation. XRD analysis shows thatα-Al2O3phase may be directly transformed from amorphous in calcining the hydroxide composite. The ZrO2-Al2O3composite ceramics manufactured from this powder has the maximum fracture toughness of 9MPa·m-1/2at 15% ZrO2and 740MPa fracture strength at 5% ZrO2. Zirconia grains about 1μm in diameter are dispersed uniformly in the alumina ceramic matrix.
Key words: zirconia-alumina powder; coprecipitation; composite ceramics
