CeO_2安定化ZrO_2の微細組織と機械的性質に及ぼす酸化物ドーピングの影響(セラミック材料小特集)

概要

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The purpose of this study is to examine the effects of some oxide additives on the grain growth and transformation behaviors of ceria doped tetragonal zirconia (Ce-TZP) to improve its mechanical properties. Monolithic Ce-TZP and some alkaline earth oxide (CaO, SrO and BaO) doped Ce-TZP were fabricated by the pressureless sintering technique at 1500 to 1700℃ in air atmosphere. The grain growth of ZrO_2 matrix was suppressed by doping alkaline earth oxide. BaO doping induced the transformation of Ce-TZP, whereas CaO doping was effective in stabilizing the tetragonal phase of Ce-TZP. CaO-doped Ce-TZP exhibited the high strength over 1000 MPa. BaO doped Ce-TZP increased the fracture toughness of monolithic Ce-TZP. There was no effect of SrO-doping on transformation behavior and mechanical properties for Ce-TZP. The relationship between the microstructure and mechanical properties of oxide doped Ce-TZP were discussed.
社団法人日本材料学会の論文
1994-06-15