Mn-Cr-O和Mn-Al-O尖晶石碳化行为研究
摘要
The carburization behaviors of Mn-Cr-O and Mn-Al-O spinels were studied in this paper. Metal stoichiometric ratio was found to have significant effect on the carburization behaviors. A higher amount of Mn than the stoichiometric ratio keeps the spinel structure stable, however a higher amount of Cr than the stoichiometric ratio induces the appearance of secondary Cr2O3 phase. In Mn-Al-O system, both MnO and Al2O3 have little solubility and excess Mn or Al induces the appearance of secondary phase. In carburization atmosphere both Mn-Cr-O and Mn-Al-O spinel were carburized. It is found when the chemical composition deviates the stoichiometric ratio the carburization resistance ability decreases. Mn-Al-O shows a better carburization resistance than Mn-Cr-O.