抄録
The important effects of gas contents on the physical properties of tantalum have necessitated an accurate method for determining the gaseous impurities in the metal. In order to establish a method for simultaneous analysis of oxygen and hydrogen in tantalum, the following investigations including application of tin-bath technique for these determinations were conducted. The experiments were carried out, by means of NRC 09-1240 Type Vacuum Fusion Gas Analyzer,to obtain information on the influence of graphite chips on removal of oxygen, the desirable ratio of tin to sample, and the range of the optimum operating temperature necessary for obtained complete removal of oxygen from standard samples. By using the proposed technique, in the presence of graphite chips and under the operating temperature 1960° to 2000°C, it is possible to determine the oxygen content in the samples wrapped in about 3∼4 times their weights of tin foils. Hydrogen may be readily released from tantalum samples by the established technique because of its thermal-decomposition. It was found that the average oxygen recovery from standards is 98% and the hydrogen values were comparatively consistent with those obtained by conventional combustion method, above the lower limit(0.005 wt% of hydrogen) of determination by the latter method.
