研削加工されたセラミックスの高温強度

概要

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We proposed an expression for the strength of ground ceramics. The expression is the function of the maximum grain depth of cut g and the fracture toughness of the workpiece material, assuming that the nucleation of median crack during grinding is explained in the same way as that in Vickers indentation test. In this paper, the strength at elevated temperature has been estimated by using the expression. Under the condition that increasing temperature does not affect the crack size, the estimation was applicable to the strength of hot-pressed silicon nitride and sintered silicon carbide ceramics by considering the temperature dependence of the fracture toughness. At an elevated temperature, both materials showed an increase in critical value of g for the strength degradation after grinding. It is suggested that the setting g based on the strength of ground material at elevated service temperature leads to the reduction in the machining time to obtain the inherent strength of the workpiece material.
社団法人日本セラミックス協会の論文
1993-06-01