Al-20Si-5.5Fe-1.2Mg-0.5Mn합금분말의 치밀화에 미치는 소결온도와 분위기의 영향
Effects of sintering temperature and atmosphere on densification of hypereutectic Al-Si alloy powders
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The densification behavior of Al-20Si-5.5Fe-1.2Mg-0.5Mn powders was investigated through micro-structure analysis of sintered specimens. The specimens sintered in vacuum or in high purity (99.999%) nitrogenshowed porous near-surface microstructures. The densification of near-surface part was enhanced by means of ultra-high purity (99.9999%) nitrogen atmosphere. The relationship betwen slow densification and oxide surfaces of Alalloy powders was discussed. And the effects of Mg addition, nitrogen gas, and humidity on densification were dis-cussed. In addition, the rapid growth of primary Si crystals above the critical temperature was reported.
Abstract
The densification behavior of Al-20Si-5.5Fe-1.2Mg-0.5Mn powders was investigated through micro-structure analysis of sintered specimens. The specimens sintered in vacuum or in high purity (99.999%) nitrogenshowed porous near-surface microstructures. The densification of near-surface part was enhanced by means of ultra-high purity (99.9999%) nitrogen atmosphere. The relationship betwen slow densification and oxide surfaces of Alalloy powders was discussed. And the effects of Mg addition, nitrogen gas, and humidity on densification were dis-cussed. In addition, the rapid growth of primary Si crystals above the critical temperature was reported.
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