Abstract
This paper describes the results of the determination of metallic fume generation from molten bronze, 85%Cu-5%Sn-5%Zn-5%Pb alloy, and the effect of double-layer covering on the molten surface on the suppression of fume dispersion. The quantity of fume generation was proportional to the vapor pressure of the metal. Maximum fume generation per unit mass of metallic component of bronze was with zinc fume because of the highest vapor pressure among alloying elements. High fume generation of zinc induced the increment of the quantity of lead fume generated from the molten bronze. High fume genration of cadmium, which is an impurity included in zinc raw material, was measured apparently. The dispersion of metallic fume emitted from the molten bronze is efficiently suppreesed by the double-layer covering on the molten surface with two kinds of material powders. The suppression efficiencies differed somewhat according to the kind of metallic fume.
