Abstract: >An electron-bombardment heating technique was applied to the measurement of the surface tension of solid niobium by a modification of the Udin method. The value obtdined is 2100 dynes cm/sup -1/ at 2250 deg C in a vacuum of approx 10/sup -5/ mm. This result is consistent with a theoretical estimate and provides support for estimates of the surface tension of the refractory metals. From measurements of the dinedral angle of grain boundaries formed in niobium by thermal etching, the interfacial energy ( gamma ') was computed to be 0.36 of the surface energy. An electrical-resistance heating technique was 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. (auth)
Publication Year: 1960
Publication Date: 1960-08-31
Language: en
Type: article
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