摘要
对镁熔体在HFC-134a/空气混合气体中和HFC-134a/CO2混合气体中的氧化行为进行了比较研究。结果发现,镁熔体在这2种混合气体中的氧化行为存在差异,而且这种差异与HFC-134a的浓度有关。当混合气体中HFC-134a浓度较高时,镁熔体在HFC-134a/CO2混合气体中的氧化速度小于HFC-134a/空气混合气体,差别不是很大;然而,当混合气体中HFC-134a浓度较低时,镁熔体在HFC-134a/CO2混合气体中的氧化速度远小于HFC-134a/空气混合气体中的氧化速度。产生差异的原因可能与氧化膜中MgF2和MgO的相对含量有关,也可能与单质的C含量有关。这一结果表明,在HFC-134a浓度保持不变的情况下,把与HFC-134a混合的稀释气体由空气改变为CO2,可提高混合气体的保护效果,尤其是在HFC-134a浓度较低的情况下。
A comparative study of oxidation behavior of molten magnesium in HFC-134a/air and HFC-134a/CO2 atmospheres was made It was found that the oxidation behavior of molten magnesium in HFC-134a/air mixtures was different from that of molten magnesium in HFC-134a/CO2 mixtures, and the difference was increased with decreasing the concentration of HFC-134a. As the concentration of HFC-134a was high, the oxidation rate of molten magnesium in HFC-134a/CO2 atmospheres was slightly slower than that in HFC-134a/air atmospheres. However, when the concentration of HFC-134a was low, the oxidation rate of molten magnesium in HFC-134a/CO2 atmospheres was much slower than that in HFC-134a/air atmospheres. These results indicate that the atmosphere of HFC-134a with CO2 as diluent can＇provide more effective protection to molten than that with air diluent at the same HFC-134a concentration, especially when HFC-134a concentration is low .
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2008年第11期1913-1918,共6页
Rare Metal Materials and Engineering
基金
陕西省自然科学基础项目(SJ08-ZT05)
宝鸡文理学院科研计划项目(ZK073)
