Ce-ZrO_2/Y-ZrO_2複合材の機械的特性

概要

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In order to improve the strength, fracture toughness and thermal stability of 12Ce-ZrO_2 ceramics, Zirconia composites consisting of 12Ce-ZrO_2 and 3Y-ZrO_2 were fabricated by normal sintering at 1450℃ and post HIP treatment at 1350℃. Some mechanical properties were evaluated for these composites. The bending strength and fracture toughness were measured by three-point bending test and indentation fracture (IF) method, respectively. The microstructures of the composites were characterized by SEM observations and TEM-EDS analysis. The phase stability in these composites were also evaluated by hydrothermal aging test at 150℃ and 0.48MPa. The addition of Y-ZrO_2 into Ce-ZrO_2 sup-pressed grain growth of 12Ce-ZrO_2 matrix and improve the mechanical properties of 12Ce-ZrO_2. Ce-ZrO_2/Y-ZrO_2 composites exhibited higher bending strength above 1000MPa and higher fracture toughness above 8MPa・m^<1/2> in the composition region of 80〜90wt% 12Ce-ZrO_2. The tetragonal → monoclinic phase transformation under hydrothermal conditions was inhibited in this composition region. It was found that the distribution of CeO_2/Y_2O_2 in the ZrO_2 matrix has a great influence on the mechanical properties and phase stability.
社団法人日本材料学会の論文
2005-11-15