| abstract |
(57) Abstract: An alumina-based sintered body having high strength and high toughness is obtained. SOLUTION: Ca, Sr, or Ba is added to a high-purity alumina temporarily sintered body having pores having a relative density of 40% to 63%. Impregnated with a solution of the metal salt of The metal salt is thermally decomposed by sintering at 600 ° C., and the crystal grains of alumina are grown in an anisotropic shape by the action when the metal oxide is formed at the crystal grain boundary. In the observation of the cut surface, anisotropic particles having a ratio of 2 or more Occupy more than the area%. The structure of the sintered body is uniform, dense and fine, and the fracture toughness can be significantly increased while maintaining high strength. |