Experimental study on new method and automatic system for fast evaluating Al-Si alloy modification effect in front of furnace

摘要

A new method based on the surface tension measurement for fast evaluating modification effect of Al-Si alloy in front of furnace and an automatic system for fast measuring surface tension of molten Al-Si alloy are introduced. By theoretical analysis the relation between surface tension sigma_e of molten Al-Si alloy and information parameters DELTA P, N, psi_x and Thas been established, namely, sigma_e = a centre dot DELTA P + b centre dot N+c centre dot (psi_x-psi_o) + d centre dot T+e. By ex- periments the relationship between surface tension and modification level of Al-Si alloy has been also got that sigma_e > 530 mN/m, 400 < = sigma_e < = 530 mN/m and sigma_e < 400 mN/m are corresponding with AFS 1-2, AFS 3-4 and AFS 5-6 of Al-Si modification effect. Depending on the conclusions, modification effect can be recognized in a few seconds, which is of practical significance for real-time evaluating modification effect of Al-Si alloy in front of furnace.