Comparison of outgassing rates from stainless steel, aluminum, and copper after bakeout under high vacuum and atmospheric pressure
Outgassing rates of vacuum vessels consisting of stainless steel, copper, and aluminum (inside surface area 7500 cm/sup 2/) at 25 deg C were measured after bakeout at 50 to 150 deg C (up to 250 deg C for s.s.). For stainless steel the outgassing rates obtained after vacuum bakeout (about 1 x 10/ sup -12/ torr liters/s cm/sup 2/) agree well with those found by other investigators. Similar values were found for copper. Much lower values of the outgassing rates were obtained for aluminuni (0.3 to 1.8 x 10/sup -13/ torr liters/s cm/sup 2/). The outgassing rates obtained after a 2-h bakeout in air at atmospheric pressure followed by a 18-h vacuum bakeout are significantly lower than those after a vacuum bakeout; in the case of stainless steel an air bakeout gives a permanent reduction of the outgassing rate. (auth)
- Research Organization:
- Oesterreichische Studiengesellschaft fuer Atomenergie G.m.b.H., Seibersdorf. Forschungszentrum
- Sponsoring Organization:
- Sponsor not identified
- NSA Number:
- NSA-29-018011
- OSTI ID:
- 4937347
- Report Number(s):
- SGAE--2158; CONF-730954--1
- Country of Publication:
- Austria
- Language:
- English
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