摘要
对含二氟甲烷(HFC32)的气体对镁合金熔体表面的保护作用进行了系统研究。研究表明,HFC32可有效保护镁合金熔体。HFC32在不同温度下保护纯镁和镁合金AM60所需的最低含量(体积分数)为0.02%～1.00%,对氧化膜组成、结构分析观察表明它有氧化镁、氟化镁等组成,表面膜平整、致密,它们与用SF6保护形成的氧化膜类似。对HFC32工程应用的可行性进行了讨论。
The protection of Mg alloy melt surface by a mixing gas containing difluoromethane was researched systematically.The results showed that the difluoromethane can effectively protect molten magnesium alloys.The minimum concentration of difluoromethane in the mixing gas is in the range of 0.02%～1% (volume fraction) for the protection of pure Mg and AM 60 alloy at different temperatures.The uniform and compaction surface oxidation film consists of MgO and MgF_2,similar to those of the film in SF_6 protective gas by structure analysis.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2005年第7期406-407,共2页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目(50204008)
关键词
镁合金
阻燃
保护气体SF6
HFC-32
Mg Alloy,Ignition-proof,Protective Atmosphere,SF6,Difluoromethane(HFC-32)
