Densification of Powder Compact Containing Large and Small Pores

Densification of Powder Compact Containing Large and Small Pores
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含有大孔和小孔的粉末压块的致密化

DOI:
10.1111/j.1551-2916.2008.02915.x
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发表时间:
2009
影响因子:
3.9
通讯作者:
Pan J
Pan J
中科院分区:
材料科学2区
文献类型:
--
作者:
Pan J

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经典的烧结理论预测,在烧结过程中,具有高配位数的孔生长而不是收缩。这导致了这样的命题,即晶粒生长可能有利于致密化。Pan和他的同事们使用计算机模拟反对这一理论,而Flinn和他的同事们提供了直接的实验证据,表明尽管配位数很高,但非常大的孔会收缩。目前的文件带来了分析和实验工作。特别是,进一步的计算机模拟证据提供支持的论点和一个分析模型来预测含有大,小孔隙的粉末压坯的致密化率。分析模型表明,当小孔被消除时,大孔的收缩率突然减小。
A classical sintering theory predicts that a pore with high coordination number grows instead of shrinking during sintering. This has led to the proposition that grain growth may be beneficial to densification. Pan and colleagues argue against this theory using computer simulations, while Flinn and colleagues have provided direct experimental evidence showing that very large pores shrink despite their high coordination number. The current paper brings the analytical and experimental work together. In particular, further computer simulation evidence is provided to support the argument and an analytical model is developed to predict the densification rate of powder compacts containing large and small pores. The analytical model shows that there is a sudden reduction in the shrinking rate of the large pores when the small pores are eliminated.
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期刊:
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