Degassing procedure for molten aluminum alloy (AC7A)
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概要
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The effects of the following factors on degassing of Al-5% Mg alloy (AC7A) were investigated.(1) Degasser.(2) Degassing temperature.(3) Flux during melting period.(4) Flux during holding period.(5) Holding time.Commercial ingot (AC7A) was melted under various degassing conditions and cast into isolite or copper mould for preparation of the specimens for estimating specific gravity and gas content.The effects of the above factors on degassing of the melts were shown by the specific gravity and gas content of the specimens, as follows.(1) The most significant factors among these were degasser and holding time.(2) Among degassers, hexachloroethane (C2Cl6) and titanium tetrachloride (TiCl4) were more effective than nitrogen, because the effects of degassing action by nitrogen appeared more slowly than those of other degassers.(3) The effects of flux during the melting period remained in the melt after degassing. Therefore, gas content after degassing was related with the content during melting period. The selection of flux should be considered as an important factor for preventing absorption of gas caused by the reaction between melt and moisture in flux or in atmosphere.(4) In the range of temperature, at which these experiments were conducted, gas content tended to increase with the rise of temperature, but the relation was not so distinct.(5) Almost no effects were given by the flux during the holding time, but it was effective only at higher holding temperature.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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