SURFACE TENSION OF REFRACTORY METALS
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 dynes/cm at 2250 C in a vacuum of approximately 0.00001 mm. This result is consistent with a theoretical estimate and provides support for Taylor's 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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1960
- Accession Number
- AD0258567
Entities
People
- H. Udin
- S. Victor Radcliffe