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祖国胤,孙溪,黄鹏,孙世亮.泡沫铝夹芯板粉末冶金发泡机理的SR-CT研究[J].稀有金属材料与工程(英文),2017,46(10):3141~3145.[Zu Guoyin,Sun Xi,Huang Peng and Sun Shiliang.Study on Powder Metallurgical Foaming Mechanism of Aluminum Foam Sandwich Using SR-CT[J].Rare Metal Materials and Engineering,2017,46(10):3141~3145.]
Study on Powder Metallurgical Foaming Mechanism of Aluminum Foam Sandwich Using SR-CT
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Received:August 03, 2015  Revised:September 15, 2015
Key words: Aluminum foam sandwich  SR-CT  powder metallurgy  foaming mechanism  porosity
Foundation item:国家自然科学基金资助(项目号U1332110);辽宁省“百千万人才工程”项目资助(项目号2013921071)
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Zu Guoyin,Sun Xi,Huang Peng and Sun Shiliang  
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      The research of cellular structure evolution of aluminum foam sandwich that made by the pack rolling/powder metallurgy foaming process has been done using SR-CT, and also the variation of porosity of aluminum foam and occurring of oversize connected pores have been analyzed. The results show that the cellular structure can be observed clearly during the appearing and growing stages by using SR-CT with the spatial resolution of micrometer. The bubble hole that similar to spalttupfel which is perpendicular to the rolling direction generated from 15 to 30 seconds, and then it is an obvious merge at about 45 seconds. With time going on, the large size connected hole form more easily. The porosity of aluminum foam grow quickly at the stage of appearing and merging process. So in order to gain excellent foaming structure of sandwich layer, the reduction of the reunion of foaming agent during mixing material and improvement of powder density of the sandwich layer is necessary.
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