Non-uniform shrinkage of guide-type MIM compact during sintering

S. Takizawa, R. Watanabe, A. Kawasaki

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

In-situ measurement of non-uniform sintering shrinkage of guide-type (ring-on-plate) MIM compacts was made by digital image correlation method. The shrinkage distribution and the distortion in the compacts were determined with a dimensional accuracy of 3μm. A periodical shrinkage distribution in the ring portion was observed in the compact during sintering, due to density distribution generated presumably by an uneven injection flow from gates located at the both ends of the base plate. An upward warpage of the base plate and a collapse of the ring portion were also observed. The inhomogeneous radial shrinkage, the base-plate warpage and the ring-collapse were interpreted in terms of the ring-portion density distribution and the effect of gravity. The periodical variation in the radius distribution during sintering was attributed to the green density distribution. A simple geometrical consideration showed that the distortion due to gravity was estimated to be approximately 2% at the most.

Original languageEnglish
Pages (from-to)445-450
Number of pages6
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume48
Issue number5
DOIs
Publication statusPublished - 2001 May

Keywords

  • Digital image correlation method
  • In-situ measurement
  • Metal injection molding
  • Non-uniform shrinkage
  • Sintering shrinkage

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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