EFFECT OF WITHDRAWING RATE ON PORE MORPHOLOGY OF LOTUS-TYPE POROUS COPPER PRODUCED BY SINGLE-MOLD GASAR TECHNIQUE
ZHUO Weijia1, LIU Yuan1, 2, LI Yanxiang1, 2
1 School of Materials Science and Engineering, Tsinghua University, Beijing 100084; 2 Key Laboratory for Advanced Materials Processing Technology (Ministry of Education), Department of; Mechanical Engineering, Tsinghua University, Beijing 100084
Abstract：A single mold Gasar process was developed to fabricate lotus-type porous copper with long and straight pores. The effects of withdrawing rate on the solidification front shape, pore morphology and average solidification rate of porous copper ingots were investigated through experimental study and Procast simulation. The results show that the solidification front shape evolves from convex to planar, then to concave with increasing withdrawing rate. In this work, 1.0 mm/s is an appropriate rate for planar solidification front. In this case, all of the gas pores grow along the axial direction (parallel to the withdrawing direction) and the pores′ straightness is the best. The average porosities of copper ingots are constant and independent of the withdrawing rate. But the average pore diameter and penetration ratio of gas pores decreased with increasing withdrawing rate.
卓伟佳, 刘源, 李言祥. 单室Gasar工艺中抽拉速率对藕状多孔Cu气孔形貌的影响*[J]. 金属学报, 2014, 50(8): 921-929.
ZHUO Weijia, LIU Yuan, LI Yanxiang. EFFECT OF WITHDRAWING RATE ON PORE MORPHOLOGY OF LOTUS-TYPE POROUS COPPER PRODUCED BY SINGLE-MOLD GASAR TECHNIQUE. Acta Metall, 2014, 50(8): 921-929.