J. Mater. Sci. Technol. ›› 2012, Vol. 28 ›› Issue (10): 951-955.

• Novel Processing and Characterization Methods • Previous Articles     Next Articles

Radial Distribution of SiC Particles in Mechanical Stirring of A356–SiCp Liquid

Yunhui Du, Peng Zhang, Jun Zhang, Shasha Yao   

  1. School of Mechanical & Controlled Engineering, Beijing Jiaotong University, Beijing 100044, China
  • Received:2011-09-18 Revised:2012-01-22 Online:2012-10-30 Published:2012-10-30
  • Contact: Peng Zhang
  • Supported by:

    the National Natural Science Foundation of China (No. 50974010), the Natural Science Foundation of Beijing, China (Nos. 3093023 and 2102039) and the Fundamental Research Funds for the Central Universities (No. 2009JBM091).

Abstract:

The mechanical stirring of A356–2.5 vol.% SiCp liquid was conducted in a cylindrical crucible by a straight-blade stirrer. The radial distribution of SiC particles in A356 liquid was studied under the conditions of 25 deg. for gradient angle α of blade and 10 mm/s for speed of moving up and down of stirrer. The results show that there exists a nonlinear relationship between rotating speed of stirrer and radial relative deviation of SiCp content in A356 liquid between the center and the periphery of crucible. The greater the rotating speed of stirrer is, the bigger the radial relative deviation of SiCp content in A356 liquid becomes and the more nonhomogeneous the radial distribution of SiC particles in A356 liquid turns. In addition, when the rotating speed of stirrer is about 200 r/min, the vertical distribution of SiC particles in A356 liquid is relative uniform. It can be seen that the nonhomogeneous distribution of SiC particles in A356 liquid results from the nonho

Key words: Radial distribution ,  Straight-blade mechanical stirring ,  Relationship

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