OUTGASSING OF HYDROGEN M. Leisch

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Institute of Solid State Physics Materials Austenitic stainless steel (Type AISI 304 and 316) is one of the most important construction materials in UHV and XHV – corrosion resistant and chemically inert – nonmagnetic – standard machining and welding procedures – relatively cheap – negligible vapor pressure at room temperature – negligible permeation of atmospheric gasses (fcc lattice) but …. Professor Manfred <strong>Leisch</strong> Horst Cerjak, 19.12.2005 63rd IUVSTA Workshop Avila September 17, 2010 4
Institute of Solid State Physics Hydrogen as impurity Solubility of Hydrogen in stainless steel The H content in standard austenitic stainless steel is about 1 ppm in weight (~ 56 at ppm). Amount equates ~ 0.1 mbar·l / cm 3 , at typical outgassing rates of 10 -11 mbar.l/cm 2 .s from 2 mm wall source for more than 50 years Professor Manfred <strong>Leisch</strong> Horst Cerjak, 19.12.2005 63rd IUVSTA Workshop Avila September 17, 2010 5
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OUTGASSING OF HYDROGEN M. Leisch

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