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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 60  2001
Mechanical Properties of (V) Zirconia-Alumina Ceramics Prepared using a Semiwet Process and Sintering
S. C. Sharma, N. M. Gokhale, J. Lakra and Ramji Lal
Pages : 126-129
DOi : 10.1080/0371750X.2001.10799985
Abstract
A series of (Y) Zr02-AI 20 3 composites of varying compositions were prepared using a semiwet process. The slurry of attrited alumina powder with a composite nitrate solution of yttriumzirconium was spray dried. The powders were decomposed and calcined at 500°C, compacted and sintered at 1550°C for 2 h. The bulk density of the sintered ceramics was > 99% of theoretical density with retention of 100% tetragonal phase in zirconia. The mechanical properties of sintered ceramics were evaluated and ceramics with 20 wt% (Y) Zr02 (2.8 mol% yttria in zirconia) exhibited highest values of flexural strength (450 MPa) and fracture toughness (7.8 MPa.m112 ). The results have been explained on the basis of microstructure of sintered ceramics and crystallite size of zirconia particles and compared with those of the earlier studies. Microstructural analysis of the sintered compacts revealed the uniform distribution of zirconia grains in alumina matrix.
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