凝胶注模工艺参数对多孔铝铜合金品质的影响.pdfVIP

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凝胶注模工艺参数对多孔铝铜合金品质的影响.pdf

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凝胶注模工艺参数对多孔铝铜合金品质的影响.pdf

Trans. Nonferrous Met. Soc. China 25(2015) 2018−2026 Effect of gelcasting conditions on quality of porous Al−Cu alloy Hai-ying YUAN, Cheng-chang JIA, Cong-cong WANG, Yu-hong CHANG, Xin-xin ZHANG, Bekouche KARIMA, Zhao-li WANG School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China Received 28 July 2014; accepted 14 November 2014 Abstract: The porous Al−Cu alloy was prepared by the gelcasting process. And the effects of gelcasting conditions, such as monomer, the volume ratio of cross-linker and monomer, dispersant and redox initiating system on the height, gelling time and the quality of green body were investigated. (It was found that the dispersant and monomer played significant roles in the height and quality of green bodies, respectively.) The optimal conditions were 10% monomer, 2% cross-linker, 0.2% initiator (volume fraction), and 1.2 g dispersant, in which the green body exhibited the best quality. The mechanisms of process conditions in eliminating the cracks and forming the pores of in the five stages were proposed. Mercury porosimetry provided a description of pore diameter ranging from 10 to 10000 nm and open porosity of 38.78 %. Key words: porous Al−Cu alloy; non-aqueous gelcasting; process conditions; crack; pore The cracks in the green bodies are usually generated in 1 Introduction the solidification of suspension from liquid to gel, solvent removal, binder removal or sintering stage. This Aluminum−co