A constitutive model for sintering of ceramic powder compacts with internal structure due to granules

Kazunari Shinagawa, Yasushi Hirashima

研究成果: Contribution to journalArticle

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Microscopic sintering behavior in compacts formed by pressing ceramic granules is examined to develop a constitutive model for analysis of macroscopic deformation. Spray-dried alumina granules are compacted by CIPing and fired at various temperatures. The internal structure composed of fractured and unfractured granules, and large crack-like cavities caused by their inhomogeneous shrinkage during sintering are observed. The macroscopic sintering rate becomes slow because of the formation of the large cavities. A basic constitutive equation for sintering of ceramic powder compacts is proposed, with the grain boundary diffusion and the grain growth taken into account. The relationship between the change in the microstructure and the shrinkage rate of the powder compacts is modelled using the basic constitutive equation. The constitutive model is applied to the finite element analysis to predict the shape change of the compacts during sintering. The calculated results show good agreement with the experimental results.

元の言語英語
ページ(範囲)155-161
ページ数7
ジャーナルNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
64
発行部数617
DOI
出版物ステータス出版済み - 1 1 1998
外部発表Yes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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