Fabrication of.Al foam without.thickening process through.melt-foaming method
Dong-hui Yang 1,2 �� Jian-qing .Chen1 �� Lei . Wang 1 �� Jing-hua Jiang1 �� Ai-bin Ma1
1 College of Mechanics and Materials , Hohai University ,Nanjing 210098 , Jiangsu , China 2 Suqian Research Institute of Hohai University ,Suqian 223814 , Jiangsu , China
Fabrication of.Al foam without.thickening process through.melt-foaming method
Dong-hui Yang 1,2 �� Jian-qing .Chen1 �� Lei . Wang 1 �� Jing-hua Jiang1 �� Ai-bin Ma1
1 College of Mechanics and Materials , Hohai University ,Nanjing 210098 , Jiangsu , China 2 Suqian Research Institute of Hohai University ,Suqian 223814 , Jiangsu , China
ժҪ By using calcium carbonate (CaCO 3) powder as the blowing agent, Al foams with porosities of.~.60 to 85% and pore size of.~.1.5.mm were fabricated via melt-foaming method. Instead of adding a thickening agent to increase Al melt viscosity, a small amount of Mg ingot (5.0.wt%) was added .rst, and then Al melt was foamed by adding calcium carbonate via the impellor stirring. The e.ect of Mg addition on the gas release behavior of calcium carbonate in the Al melt was investigated. The compression behavior of fabricated Al foams was examined. The results show that the blowing gas is possibly from the reaction between Mg and calcium carbonate, and this reaction can produce solid oxides with micrometer level size, which leads to increasing the Al melt viscosity and is bene. cial for inhibiting pores coarsening. Besides, the micrometer level cracks in the cell walls make the strength of Al foam decrease.
Abstract��By using calcium carbonate (CaCO 3) powder as the blowing agent, Al foams with porosities of.~.60 to 85% and pore size of.~.1.5.mm were fabricated via melt-foaming method. Instead of adding a thickening agent to increase Al melt viscosity, a small amount of Mg ingot (5.0.wt%) was added .rst, and then Al melt was foamed by adding calcium carbonate via the impellor stirring. The e.ect of Mg addition on the gas release behavior of calcium carbonate in the Al melt was investigated. The compression behavior of fabricated Al foams was examined. The results show that the blowing gas is possibly from the reaction between Mg and calcium carbonate, and this reaction can produce solid oxides with micrometer level size, which leads to increasing the Al melt viscosity and is bene. cial for inhibiting pores coarsening. Besides, the micrometer level cracks in the cell walls make the strength of Al foam decrease.
Dong-hui Yang , �� Jian-qing .Chen �� Lei . Wang �� Jing-hua Jiang �� Ai-bin Ma. Fabrication of.Al foam without.thickening process through.melt-foaming method[J].Journal of Iron and Steel Research International, 2018, 25(1): 90-98.
Dong-hui Yang , �� Jian-qing .Chen �� Lei . Wang �� Jing-hua Jiang �� Ai-bin Ma. Fabrication of.Al foam without.thickening process through.melt-foaming method. , 2018, 25(1): 90-98.
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2018, Vol. 25 
