摘要
对HFC-134a气体在高温镁及镁合金表面的分解行为进行了研究。结果表明,HFC-134a气体在镁和AZ91合金表面大约从400℃开始发生分解,其分解程度随着熔体温度的升高而增大,700℃时的分解率为80%左右。分解产物主要为CO2、CO、HF,其中HF的含量与进入熔炼炉的混合气体中HFC-134a的浓度、熔体温度以及与HFC-134a相混合的气体的性质有关。增加HFC-134a的浓度,升高熔体温度,HF的含量增加;以CO2代替空气,HF的含量减小。
The decomposition behavior of HFC-134a on the heated magnesium and magnesium alloy melt surface was investigated. The results show that HFC-134a on the heated magnesium and magnesium alloy surface begins to decompose at around 400 ℃. The decomposition degree increased with temperature and the decomposition rate at 700 ℃ was approximatwly 80%. The primary degradation productions resulting from the interaction of HFC-134a with the heated melt surface are CO, CO2 and HF. HF concentration is related with HFC-134a concentration in the cover gas mixture, melt temperature and the properties of gas mixed with HFC-134a. HF concentration increased with increasing the level of HFC-134a in the cover gas mixture and temperature but decreases by replacing air with CO2 to mix with HFC-134a.
出处
《铸造技术》
CAS
北大核心
2008年第1期59-63,共5页
Foundry Technology
基金
宝鸡文理学院科研基金资助项目(ZK06102)
关键词
四氟乙烷
镁及镁合金
熔体
分解
HFC-134a
Magnesium and magnesium alloy
Melt
Decomposition
