908. Alkali metals evaluation programme. The vapour pressure of lithium

Classified 46. GLASS TO-METAL

abstracts

907-903

BLOWING, GLASS-TO-METAL SEALING TECHNIQUES

AND

CERAMIC-

46 907. A bakeable and direct joint between a fused quartz tube and a metal one. (Great Britain)

A method is described for joining quartz tubes to Kovar tubes under vacuum, using inductive heating, and titanium braze. The leakages obtained are less than 1 torr litre se@ after tests, and the joints may operate at a temperature of 400°C and at 20 atm or in vacuum. (Italy) L Verhayden et al, J Sci Instrunz, (JPhys E), Ser 2 1 (2), 1968, 145-147. 47. OUTGASSING

DATA, VAPOUR TERING DATA, RESIDUAL GASES RESIDUAL GAS ANALYSIS 908. Alkali metals lithium. (USA)

evaluation

PRESSURE DATA, GETIN VACUUM SYSTEMS,

programme.

The vapour

pressure

47 of

Vapour pressure of lithium was determined at temperatures from 1881 to 2286°F and pressures from 0.96 to 7.86 psia. Although experimental difficulties prevented extension of the work to higher temperatures, the data agree with those of other investigations. P Y Achener and D L Fisher, Rep AGN-8191, Vol 2, July 1967, 21 pages (Sci Tech Aerospace Reps, 5 (23), 4365, N67-38995).

VI.

Miscellaneous

64. BOOK REPORTS

REVIEWS,

SYMPOSIA

PROGRAMMES

AND

64 : 20 Seminar on ultrahigh vacuum problems. See abstract number 816.

303