MgO焼結体の破壊靱性に及ぼす粒径及び第2相の影響(第1報) : Al_2O_3添加系

概要

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The influence of grain size and secondary phase on the fracture toughness K_<IC> of sintered MgO bodies was investigated. Sintered MgO bodies doped with 1-10 wt% Al_2O_3 were made by hot-pressing. The grain size was changed by annealing. The fracture toughness K_<IC> was measured by a chevron-notched beam method. The fracture toughness of sintered MgO bodies doped with Al_2O_3 was independent of the grain size and the amount of Al_2O_3, and indicated a constant value of 2.2 MPa √<m>, 20% larger than that of pure MgO. The fractography revealed that the toughening of Al_2O_3-doped MgO bodies corresponded to the increase in the fraction of stepwise transgranular fracture on the fracture surfaces. It was considered that the change in fracture mode resulted from residual thermal stresses generated near secondary phase particles (MgAl_2O_4).
社団法人日本セラミックス協会の論文
1992-06-01