Yttria-magnesia partially stabilised zirconia reinforced with MgAI₂O₄ spinel particles

Abstract

Ultrafine active ZrO₂-MgO-Y₂O₃ and ZrO₂-MgO-Y₂0₃-Al₂0₃ powders with an MgO content of13–14 mol.-%, corresponding to the eutectoid composition, were prepared by chemical coprecipitation and sintered at 1550°C to give fine grained cubic stabilised zirconia (CSZ) ceramics. By aging at 1100°C, subeutectoid decomposition occurred and partially stabilised zirconia (PSZ) structural characteristics were achieved. Phase compositions, microstructural changes, and mechanical properties versus aging time at 1100°C have been investigated and are reported.