Accession Number:

AD0258567

Title:

SURFACE TENSION OF REFRACTORY METALS

Descriptive Note:

Corporate Author:

MANLABS INC CAMBRIDGE MASS

Personal Author(s):

Report Date:

1960-12-01

Pagination or Media Count:

1.0

Abstract:

An electron-bombardment heating technique has been applied to the measurement of the surface tension of solid Nb by a modification of the Udin Surface tension of refractory metals, WADD-1960 method. The value obtained is 2100 dynescm at 2250 C in a vacuum of approximately 0.00001 mm. This result is consistent with a theoretical estimate and provides support for Taylors estimates of the surface tension of the refractory metals. From measurements of the dihedral angle of grain boundaries formed in niobium by thermal etching, the interfacial energy was computed to be 0.36 of the surface energy. An electrical-resistance heating technique has been applied to the measurement of the surface tension of solid tungsten, molybdenum and niobium by a modification of the Udin method. The method in this form was found to be unsuitable for these metals. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE