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

Anew 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 AP, N, phi(x) and T has been established, namely, sigma(e) = a . Delta P+ b . N+ c. (phi(x) - phi(0)) + d - T+e. By experiments 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.