1984 年 25 巻 5 号 p. 356-360
The form of the compounds of Mn and Fe–Mn carbides produced by the carbon thermic reduction of their oxides is determined by the effluent gas analysis (EGA) method using He-O2 gas mixture. The obtained results are as follows:
(1) The oxidation of Mn carbide to Mn2O3 starts at 789 K and that of Fe–Mn carbide occures from 730 K, resulting in a mixture of Mn2O3 and Fe2O3.
(2) By the isothermal EGA method at 953 and 903 K, Mn and Fe–Mn carbides are identified to be Mn7C3 and (Fe, Mn)7C3 phases, respectively.
These observations are supported by the results of EPMA and X-ray diffraction examinations. Thus, it is concluded that the EGA method is useful tool for a state analysis of carbides.
