摘要
通过Y和Ca的同时加入获得了阻燃效果优异的Mg-3.5Y-0.8Ca阻燃镁合金,实现了镁合金在大气条件下的无保护熔炼。俄歇电子能谱仪和X射线衍射表面分析结果表明:Mg-3.5Y-0.8Ca阻燃镁合金在高温下暴露于大气中时,合金表面会生成一层以Y2O3为主的氧化膜;干燥空气中,Mg-3.5Y-0.8Ca合金在773、873和973K下氧化时,其氧化动力学曲线遵循立方规律;基于高温氧化热力学分析,建立了Mg-Y合金在高温下的选择性氧化模型,并分析Ca在Mg-Y合金选择性氧化中的第三元素效应,即Ca元素加入Mg-Y合金后,同时起到“吸气剂”作用和增强Y元素表面活性的作用,因而大大降低了Y2O3发生选择性氧化所需Y含量阈值。
Ignition-proof magnesium alloy bearing yttrium and calcium was acquired. The alloy Mg-3. 5Y-0. 8Ca could be melted without any protections. Auger electron spectrometer and X-ray diffraction analysis of oxide scale reveal that the oxide film forms on the surface of Mg-3.5Y-0.8Ca alloy is mainly composed of Y2O3. Thermogravimetric measurements in dry air reveal that the oxidation dynamics curves measured at 773, 873 and 973 K follow the quartic law. Based on the oxidation thermodynamics analysis, the model of the selective oxidation for Mg-Y alloys was established, and both the selective oxidation and the third element effect of Ca lead to the formation of the film composed mainly of Y2O3 for Mg-3.5Y-0.8Ca alloy.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2006年第10期1716-1723,共8页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(50271055)
航空基金资助项目(01G53048)
教育部博士点基金资助项目(20020699018)
