クヌーゼンセル質量分析法によるFe-Mo合金の熱分析
1982 年 68 巻 16 号 p. 2569-2577
詳細
1982 年 68 巻 16 号 p. 2569-2577
Thermal analysis of Fe-Mo alloys was carried out by the use of Knudsen cell mass spectrometry. The composition range of the alloys and the temperature range studied were 25 to 67 at %Mo and 1300 to 1650°C, respectively.
Temperatures for invariant transformation reactions obtained are as follows:
α=L+δ; 1454±2°C
δ=L+σ; 15031521°C
σ=L+(Mo); 1610±1°C
The temperatures for the decomposition of α and δ phases agree well with the previously reported values. As to the temperature of the decomposition of σ phase, present result is about 70°C higher than the previous value.
On cooling of samples, linear relation was observed between the degree of super cooling and the temperature at which the transformation took place.
In this technique, the ion intensity is used as the measure of the temperature of sample. The ion intensity is related to the effusate in equilibrium with the surface of sample. Further, the ion intensity is roughly exponential function of the temperature. Thus, this technique is featured with noncontactive, very low time constant and highly sensitive measurement of the temperature of sample.
