溶融 Zn 浴中ドロスの存在状態

概要

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A study was conducted on the formation of Zn-Fe and Fe-Al crystals in a molten Zn bath. Baths similar in composition to that of a CGL, were prepared in the laboratory and attention was paid on the cooling rate in Zn bath sampling. When samples were cooled at lower cooling rates than 100℃/s, crystallization and crystal growth were observed in the Zn bath sample ingots. Higher cooling rates than 10^5℃/s inhibited the crystallization and crystal growth during cooling. In order to evaluate the presence of crystals in the Zn bath, it is necessary to employ a rapid cooling. The type of crystal changed with the Al content of the bath. In a bath containing above 0.13mass% Al, Fe_2Al_5 formed. Below 0.13mass%, FeZn_7 formed. From the results obtained with the rapid cooling technique, an equilibrium solubility curve for Fe and Al was estimated in the region where Fe_2Al_5 was crystallized. The curve was expressed as Log[Fe]^2[Al]^5=5.37-9354/T for Fe+5/2Al=1/2Fe_2Al_5. With this equation, the available Zn-Al-Fe ternary phase diagram in the literature was corrected at the Zn corner.
1995-08-01