| 摘要 |
Disclosed is a protective gas composition for preventing combustion of a molten magnesium/magnesium alloy. The protective gas composition is composed of a compound selected from the group consisting only of specific fluorine-containing organic compounds, namely 1,1,1,3,3-pentafluoropropane (HFC-245fa), 1,3,3,3-tetrafluoropropene (OHFC-1234ze), methyl 1,1,2,2-tetrafluoroethyl ether (HFE-254pc) and mixtures of those, and a carrier gas.
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