Prediction of fracture in sintering of ceramic powder compact

• Published in: International journal of machine tools & manufacture Vol. 37; no. 9; pp. 1327 - 1336
• Main Authors: Mori, Ken-Ichiro, Osakada, Kozo, Miyazaki, Masahide
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.09.1997; Elsevier
• Subjects: Applied sciences; Building materials. Ceramics. Glasses; Ceramic industries; Chemical industry and chemicals; Compaction; Exact sciences and technology; Finite element method; Fracture; General studies; Powders; Strain; Technical ceramics; Finite element method; Circular plate; Ring; Sintering; Manufacturing; Shrinkage; Ceramic materials; Modeling; Powder; Crack initiation
• ISSN: 0890-6955; 1879-2170
• DOI: 10.1016/S0890-6955(96)00065-X

A criterion for predicting fracture initiation due to non-uniform shrinkage in sintering of ceramic powder compacts is proposed. In the present criterion, the occurrence of sintering fracture is evaluated by using the difference in volumetric strain between non-uniform and uniform shrinkages because the stress is induced by the difference in volumetric strain during sintering. The material constants in the criterion are determined from a sintering test using ringed compacts under restriction of the shrinkage. Non-uniform shrinkage behaviour due to the density distribution in sintering of circular plates and rings with a boss is simulated by the viscoplastic finite element method, and the occurrence of sintering fracture is predicted from the calculated results by the use of the criterion. The predicted fracture rates and sites for the sintered products are in good agreement with the experimental ones for alumina compacts.