Outgassing Characteristics of Vacuum Insulation Cup Material: An Experimental Study

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℃.