Dispersion of SiC particles in mechanical stirring of A356-SiC_p liquid

In order to clarify the dispersion of SiC particles in straight-blade mechanical stirring of A1-SiCp liquid, the dispersion of SiC particles in A356-3.5% SiCp （volume fraction） liquid in a cylindrical crucible was studied. The relationship between rotating speed of stirrer and radial relative deviation of SiCp content in A356 liquid between the center and the periphery of crucible was established in the conditions of 35° for the gradient angle a of blade and 10 mm/s for the speed of moving up and down of stirrer. The results show that the radial relative deviation of SiCp content increases gradually with increasing the rotating speed of stirrer. When the rotating speed of stirrer is 200 r/min, the vertical dispersion of SiC particles in A356 liquid is even, but the radial relative deviation of SiCp content is 0.24. Consequently, the northomogeneous dispersion of SiC particles in A356 liquid is mainly resulted from the nonhomogeneous radial dispersion of SiC particles.

In order to clarify the dispersion of SiC particles in straight-blade mechanical stirring of Al-SiCp liquid,the dispersion of SiC particles in A356-3.5% SiCp(volume fraction) liquid in a cylindrical crucible was studied.The relationship between rotating speed of stirrer and radial relative deviation of SiCp content in A356 liquid between the center and the periphery of crucible was established in the conditions of 35° for the gradient angle α of blade and 10 mm/s for the speed of moving up and down of stirrer.The results show that the radial relative deviation of SiCp content increases gradually with increasing the rotating speed of stirrer.When the rotating speed of stirrer is 200 r/min,the vertical dispersion of SiC particles in A356 liquid is even,but the radial relative deviation of SiCp content is 0.24.Consequently,the nonhomogeneous dispersion of SiC particles in A356 liquid is mainly resulted from the nonhomogeneous radial dispersion of SiC particles.