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Packing Structure of Particles in a Green Compact and Its Influence on Sintering Deformation

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The anisotropy of the structure in a die-pressed compact was studied directly through detailed analysis by confocal scanning laser fluorescent micrographs. The use of confocal optics and an immersion liquid produced micrographs that represented the structure of a cross section at a certain depth along two directions: parallel and normal to the pressing direction. The network formed by particles in contact was analyzed by measuring the components of particle contact parallel and normal to the pressing direction in the green compact. Different values were obtained in the total components of particle contact for the horizontal and normal directions for the cross section parallel to the direction of pressing: the ratio between these values was 1.15. This suggests that there should be 15% more shrinkage in the direction parallel to pressing, at least during the initial stages of sintering when the particle geometry is preserved.
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Document Type: Research Article

Affiliations: Department of Materials Science and Engineering, Nagaoka University of Technology, Nagaoka, Japan

Publication date: 01 November 2007

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