Abstract
It is very hard in practice to get a sound sheet ingot without gases and cavities in the casting of pure aluminium. The gas content of aluminium has been hereto examined by many investigators and its contentt was recently brought to clear to be as small as less than 1c.c/100grs.The authers studied the comparative value of gas content and the porosity of 60kg's sheet ingot with 99.9%, 99.5% and 99.2% purities which were cast in book mould and direct-chill mould, and the following results have been obtained.(1) The higher the purity of aluminium, the lower the value of gas content.(2) The gas content increases towards the surface layer from its centre layer of sheet ingot.(3) The percentage of hydrogen in total gas is 64-71%.(4) The gas content of sheet ingot by C. C. P. is smaller by 50% than that of book mould process.(5) The percentage of porosity in the sheet ingot by C. C. P of 99.5% purity is lesst han 1%, on the other hand that of book mould is generally more than 3%.(6) There is no direct relation between the blister on sheet and the gas content of sheet ingot, but no blister occurs on the sheet rolled from C. C. P sheet ingot.
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