Out-gases evolved from Ceramics in Vacuum at Room Temperature

概要

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Gas evolution from ceramics in vacuum at room temperature was studied by mass-spectrometric method. As the gas evolution rates from ceramics at room temperature after the degassing at 400°C for 2 hours in vacuum were too small to measure by dynamic method, gases were stored in a glass-ampoule with side tubes, each sealed with a breakable joint. Joining a side tube to a mass-spectrometric gas analysor, and breaking the breakable joint, gases evolved from ceramincs were analyzed. It was found that (1) argon-evolution rates from various ceramics decreased in the order of, baked talc > steatite > forstelite > alumina ceramics; (2) argon-evolution rates from steatite varied from sample to sample, i.e. 1.7×10-6-14×10-6cc. Torr/g for a storage time of about 50 days; (3) the analysis showed compositions of the out-gases from ceramics were like that of air; and (4) the time constant of argon evolution was8.7days to an example of steatite during the measurement of 60 days.
日本質量分析学会の論文