镁合金熔炼保护气体研究现状与展望

摘要

Necessity and advantages of gas protection method during melting of magnesium alloy are presented. Application method, protecting effects, mechanism of protection and limitations of several kinds of traditional protective gases are reviewed, such as inert gases N2, CO2, SO2, BF3 and SF6. According to the fact that the most popular used gas SF6 is being forbidden due to its high greenhouse effect, several potential kinds of fluorine-containing protective gases ( HFC-134a,HFE7100, HFE7200 and Novec 612TM) are introduced. Present status and application prospect of these gases are discussed. It is pointed out that finding new kinds of gas to replace SF6 is a very pressing and important task. A reasonable research method is put forward and its development tendency in the future is discussed. The conception includes mixing production, calculous-reaction,and pulse huffing.%阐述了镁合金熔炼气体保护的必要性和优越性,综述了几种传统熔炼保护气体:惰性气体、N2、C02、S02、BF3、SF6的使用方法、保护效果、保护机制以及局限性.针对目前应用最多的SF6气体因具有较高的温室效应将被禁用的现状,介绍了几种较具潜力的新型含氟保护气体HFC-134a、HFE7100、HFE7200和Novec612TM,论述了其研究应用现状和发展趋势.阐述了开发SF6替代气体的紧迫性和重要性,提出了多种气体"产物复配"、"反应微分"、"脉冲供气"的保护方式的研究思路,并对其未来的发展情况进行了展望.