摘要
A wet‐chemical approach is applied to derive fine powders with compositions 11 mol% CeO 2 ‐ZrO 2 , 1 mol% YO 1.5 ‐10 mol% CeO 2 ‐ZrO 2 , 12 mol% CeO 2 ‐ZrO 2 , and 2 mol% YO 1.5 ‐10 mol% CeO 2 ‐ZrO 2 by the coprecipitation method. The characteristics of the as‐derived powders are evaluated through thermal analysis and electron microscopy. The sintering behavior of the calcined powders is carried out at 1400° and 1500°C for 1 to 10 h. Sintered density higher than 98% of theoretical is achieved for sintering at 1400°C for several hours. The as‐sintered density dependence on the sintering condition is related to the extent of tetragonal‐to‐monoclinic phase transformation as well as the associated microcracks. Partial substitution by Y 2 O 3 in CeO 2 ‐ZrO 2 results in reduced grain size and tends to stabilize the tetragonal structure. Y 2 O 3 is more effective than CeO 2 with respect to the grain size refinement and tetragonal stability. In addition, Y 2 O 3 substitution in CeO 2 ‐ZrO 2 increases the hardness, while it decreases the fracture toughness. Copyright © 1988, Wiley Blackwell. All rights reserved