Outgassing and Permeation

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Outgassing and PermeationModel of a Semi-infinite solid withvolatile impuritiesSources of Outgassing! General! Adsorbed Water and other gases! Metal surfaces! Bulk Impurity diffusion! Surface Impurities! Crystal boundaries! Nonmetal surfaces! Base material volatilization! Thermal and Radiation Damage! Search engine:http://outgassing.nasa.gov4
Outgassing and PermeationBeware: Outgassing and Permeation areoften merged in casual vacuum discussionsThe devil is in the details!virtual leaksreal leaksPermeationSemi-infinite De-VolatilizationThermal decompositionSurface gas desorbtion.Effects on Ultimate BasePressure! Outgassing and permeation from o-rings often constrain the ultimatebase pressure of a vacuum system.! The outgassing rate of an o-ring canbe reduced by baking or time.! The permeation rate of an o-ringusually remains constant, but issteeply temperature dependent.5
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Outgassing and Permeation

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