526 擬似生体環境中におけるアルミナセラミックスの微細組織と力学特性の相関性(GS-16 材料強度)  [in Japanese] 526 Correlation between micro structural and mechanical property of Alumina ceramics on similar body fluid environment  [in Japanese]

The number of aged person is increasing having a disease for bone, tooth and innards. So the necessity of these substitute materials must be increasing. Alumina ceramics are used for substitute materials as bonehead of a thighbone joint, because of its high strength and bio-inert properties. For many biomaterials a fracture occurs due to both corrosion and fatigue. In this study, effects of similar body fluid (SBF) environment on mechanical properties and microstructure of Al_2O_3 were investigated. Microstructural changes of Al_2O_3 ceramics due to SBF corrosion degradation were also examined by scanning electron microscope after long time immersion into SBF at 37℃. Degradation of bending strength and fracture toughness (K_C) were evaluated.