Abstract
To reduce the quantity of dissolved volatile gases in oxygen free copper (OFC), a vacuum treatment for molten copper is the most effective method. The application of vacuum degassing to a fully continuous casting plant was made and a successful mass production of OFC ingots has been achieved. Microscopic observation shows that the vacuum treated OFC meets the requirement of the standard specification of the ASTM-F-68 Class 1 for its low porosity count. Gas chromatographic analysis also reveals that it has 50% less contents of dissolved gas than the normally manufactured OFC. To investigate the gas desorption during ion bombardment, SIMS measurements for the vacuum treated OFC have been carried out. It is thought that most of the desorbed gas consists of hydrogen and oxygen, and that their amounts are less than half of those from normally manufactured OFC.
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