Proceedings of the Korean Powder Metallurgy Institute Conference (한국분말야금학회:학술대회논문집)
- 2006.09a
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- Pages.68-69
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- 2006
True Sedimentation and Particle Packing Rearrangement during Liquid Phase Sintering
- Lee, Jong-K. (Dept. of Materials Science and Engrg., Michigan Technological University) ;
- Xu, Lei (Dept. of Materials and Metallurgical Engrg., New Mexico Institute of Mining and Technology) ;
- Lu, Shu Zu (School of Materials Science and Engrg., University of Science and Technology Beijing)
- Published : 2006.09.24
Abstract
When an alloy such as Ni-W is liquid phase sintered, heavy solid W particles sedimentate to the bottom of the container, provided that their volume fraction is less than a critical value. The sintering process evolves typically in two stages, diffusiondriven macrosegregation sedimentation followed by true sedimentation. During macrosegregation sedimentation, the overall solid volume fraction decreases concurrently with elimination of liquid concentration gradient. However, in the second stage of true sedimentation, the average solid volume fraction in the mushy zone increases with time. It is proposed that the true sedimentation results from particle rearrangement for higher packing efficiency.