Study on Flow Field and Process of New Stirrer for Stir Casting of SiCp/Al Composites
ZHANG Zhenlin1,2, ZHANG Zhifeng1, XU Jun1, ZHANG Hao1, MAO Weimin2
1 National Engineering & Technology Research Center for Non-ferrous Metal Matrix Composite, General Research Institute for Non-ferrous Metals, Beijing 100088; 2 School of Materials Science and Engineering,University of Science and Technology Beijing, Beijing 100083
Abstract: Preparing SiCp/Al composites by stir casting process has the advantage of low cost and near-net shape. However, it is difficult to make SiC particles uniformly distribute in Al alloys, which is strongly dependent on the stirrer configuration and its casting process. In this study, a new paddle-grid compound stirrer was investigated to achieve powerful and uniform stirring by numerical and experimental methods. The velocity and flow field of the paddle-grid compound stirrer and the single stirrers were nume-rically compared, and then the optimal stir process using paddle-grid compound stirrer was experimentally done. The results showed that more uniform stir and more intense shear in large volume slurry could be achieved for the paddle-grid compound stirrer than the single stirrers. The flow field of paddle-grid compound stirrer was axial and radial circulation and the liquid level was smooth. The maximal fluid velocity was 3.9 m/s with the rotating speed of 500 r/min. The SiCp uniform distribution without pore was obtained in the production of 20wt%SiCp/A357 composites at the conditions of the optimal process parameters of stir temperature 610 ℃, stir speed 500 r/min and stir time 20 min.
张桢林,张志峰,徐骏,张浩,毛卫民. SiCp/Al复合材料搅拌铸造新型搅拌器流场及工艺研究*[J]. 材料导报编辑部, 2017, 31(10): 141-145.
ZHANG Zhenlin,ZHANG Zhifeng, XU Jun, ZHANG Hao, MAO Weimin. Study on Flow Field and Process of New Stirrer for Stir Casting of SiCp/Al Composites. Materials Reports, 2017, 31(10): 141-145.
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2017, Vol. 31 
