真空保温杯常用材料放气特性研究

Outgassing Characteristics of Vacuum Insulation Cup Material: An Experimental Study

材料放气是真空保温杯真空度保持和寿命的重要技术指标。本文利用新型基于转换气路法材料放气率测试系统,对钛合金钢、304不锈钢和银等三种真空保温杯常用材料在室温、200℃、400℃真空条件下的放气率和放气成分等特性进行了研究。结果表明,室温下三种材料的放气率由小到大依次为钛合金钢、304不锈钢和银,放气成分均主要以H2分子和H2O分子为主;在温度升高过程中,三种材料放出的H2O分子含量均会缓慢减少,但是放出的H2分子含量的变化趋势却有所不同,304不锈钢和银的H2分子含量随温度升高呈现先增大后减小的趋势,而钛合金钢中H2分子含量则快速增大。因此,在真空除气工艺中,304不锈钢和银的烘烤温度设置400℃以下即可,而钛合金钢内部H2分子含量较高,较难除去,除气工艺应高于400℃。

We addressed the service-life of commercial vacuum insulation cup.The influence of the baking temperature of vacuum insulation materials,including T-alloy steel,304 stainless steel and silver,on the desorption-rates of H2O and H2 was experimentally investigated with the lab-built test platform,equipped with quadrupole mass spectroscopy.The preliminary results show that depending on the temperature,the outgassing rates can be listed in a descending order:Ti-alloy steel>304 stainless-steel>silver.As expected,desorption rate of H2O is rather slow for all metallic materials.However,when it comes to desorption rate of H2,material properties make the difference.To be specific,as the baking temperature increased up to 400℃,H2-desorption from silver and stainless-steel changed similarly in an increase-decrease mode,but H2-desorption from Ti-ally still rapidly increased,indicating that Ti-alloy steel should be baked at a temperature higher than 400℃.