Sintering of mixtures of powders: Experiments and modelling
Sintering of mixtures of powders: Experiments and modelling
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DOI：
10.1016/j.powtec.2008.04.057
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发表时间：
2009-03-05
影响因子：
5.2
通讯作者：
Bouvard, Didier
中科院分区：
文献类型：
--
作者：
Olmos, Luis;Martin, Christophe L.;Bouvard, Didier
粉末冶金允许复合材料。特别是金属-陶瓷复合材料，其通过烧结粉末混合物来生产。本文分析了金属粉末与陶瓷夹杂物混合后的烧结行为。已经用大约相同尺寸的铜和氧化铝颗粒的混合物进行了实验，氧化铝的体积分数在5%和30%之间。用扫描电子显微镜观察了烧结材料的显微结构，并通过透射电镜分析了粉末混合物的致密化动力学。采用离散元法对烧结过程进行了模拟。根据实验和模拟结果，讨论了惰性夹杂物对金属-陶瓷粉末混合物自由烧结致密化的影响。我们发现，特别是致密化显着延迟，即使是低至5%的夹杂物的体积分数和强烈阻碍时，该含量达到20%。(C)2008 Elsevier B. V.保留所有权利。
Powder metallurgy allows composite materials. notably metal-ceramic composites, to be produced by sintering a mixture of powders. This work analyses the sintering behaviour of metal powder mixed with ceramic inclusions. Experiments have been performed with mixtures of copper and alumina particles of about the same size and volume fractions of alumina between 5 and 30%. The densification kinetics of powder mixtures have been deduced from dilatometry measurement and the microstructure of sintered materials has been observed by scanning electron microscopy. The sintering process has also been modelled by using discrete element method. From both experimental and simulation results the effect of inert inclusions on the densification of metal-ceramic powder mixtures during free sintering is discussed. We found in particular that the densification was significantly delayed even for a volume fraction of inclusions as low as 5% and strongly hindered when this content got to 20%. (C) 2008 Elsevier B.V. All rights reserved.