セラミックス圧粉体の焼結における割れ発生の予測

概要

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A criterion for predicting fracture initiation due to nonuniform shrinkage during sintering of ceramic powder compacts is proposed. In the present criterion, the occurrence of sintering fracture is evaluated by using the difference of volumetric strain between uniform and nonuniform shrinkages, because the stress is induced by the difference of volumetric strain during sintering. The material constants in the criterion are determined from a sintering test using ringed compacts under con-strained shrinkage. Nonuniform shrinkage behaviour in sintering of circular plates and rings with a boss is simulated by the viscoplastic finite element method and the initiation of sintering fracture is predicted from the calculated results using the criterion The compacts undergo nonuniform shrinkage during sintering due to the density distrilbution and the dead weight. The predicted fracture rates and sites for the sintered products are in good agreement with the experimental ones for alumina compacts.
一般社団法人日本機械学会の論文
1996-03-25