Outgassing from internal adhesive joints of vacuum devices.

Kinetics of the formation of residual atmosphere in vacuum devices with internal adhesive joints and the application of the mass spectral and chromatographic methods to measure the specific outgassing rate of volatile compounds from the cured adhesives are considered in this paper. The outgassing comparison data for the various types of adhesives are given and the effectiveness of the outgassing of adhesive joints is demonstrated. The possible options to provide vacuum in the various devices are considered. At moderate requirements to the residual pressure (about 10^-2 Pa), it is enough to degass the adhesive joints during a few hours. It is much more difficutt to provide vacuum in devices with internal adhesive joints at the level of about 10^-4 Pa This requires the use of the built-in getter and the high temperature degassing. It is expedient to provide deep vacuum (10^-5 -10^-4 Pa) in the rare-used or once-used devices by short (a few minutes) activation the built-in getters before operating the vacuum devices. This allows to remove the main residual gas hydrocarbons component from the vacuum house and provide the necessary level of vacuum for a certain interval of time. [ABSTRACT FROM AUTHOR]