AVS 49th International Symposium
    Vacuum Technology Wednesday Sessions
       Session VT-WeM

Invited Paper VT-WeM1
Influence of Thermal and Surface Treatments on the Outgassing Of Austenitic Stainless Steels Studied by Thermal and Electron Stimulated Desorption

Wednesday, November 6, 2002, 8:20 am, Room C-104

Session: Outgassing
Presenter: P. Chiggiato, CERN, Switzerland
Authors: C. Benvenuti, CERN, Switzerland
P. Chiggiato, CERN, Switzerland
G. Chuste, CERN, Switzerland
I. Wevers, CERN, Switzerland
Correspondent: Click to Email
Austenitic stainless steel is at present the most widely used material for UHV applications. In order to improve its vacuum behavior, several post-production treatments are usually applied. Surface chemical and electrochemical processing are used to reduce surface contamination and/or roughness, while heating, either under vacuum or in air, is applied to decrease hydrogen thermal outgassing. The effect of these treatments on the content and on the binding state of surface and bulk gases has been studied by thermal desorption spectroscopy and electron stimulated desorption. The enrichment of hydrogen induced by surface electro-polishing and the effect of the residual hydrogen pressure during vacuum firing have been studied in detail.