Mechanical properties and low temperature degradation resistance of alumina-doped 3Y-TZP fabricated from stabilizer coated powders

摘要

In this study nanoscale monoclinic zirconia was coated with 3 mol % yttria via the nitrate route. Up to 2 vol.% of alumina were added by either coating or mixing and milling. The mechanical properties of the materials, microstructure and phase composition were studied. Low temperature degradation resistance was determined by an accelerated autoclave test. The TZP materials showed a high tough-ness of > 10 MPaVm combined with a strength of ?740-1000 MPa. Low temperature degradation resistance improved with alumina addition, here the introduction of alumina by mixing and milling was more efficient than by powder coating; the maximum monoclinic fraction in the mixed composite was only 6 vol.% after 100 h of autoclave ageing at 134。C and the monoclinic phase did not form a fully connected layer.