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Evolution of MnO–SiO2–Al_(2)O_(3)–MgO inclusions during heat treatment at 1100℃

Journal of Iron and Steel Research(International) 2024年第5期31卷 1221-1231页

作者： Xu-bo Lei Jian-li Li Qiang Zeng Hang-yu Zhu Yue Yu The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081HubeiChina Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking Wuhan University of Science and TechnologyWuhan430081HubeiChina Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan430081HubeiChina

To investigate the evolutionary behavior of the MnO–SiO_(2)–Al_(2)O_(3)–MgO inclusions during heat treatment,water quenched samples were isothermally held at 1100°C for 120 min in Ar and air atmosphere,and the obtaining samples were analyzed by X-ray diffraction,scanning electron microscopy and energy dispersive spectrometer.It showed that 3MnO·Al_(2)O_(3)·3SiO_(2)and MnO·SiO_(2)were detected in the 5 wt.%MgO system after isothermal holding in Ar atmosphere,while MgO·Al_(2)O_(3),MnO·SiO_(2)and Mn7O8·SiO4 were detected in air atmosphere.The evolutionary behavior of the 10,15 and 20 wt.%MgO systems after isothermal holding in different atmosphere were consistent.Oxygen affected the solid phase transformation of the low MgO content systems.The calculation results of FactSage 8.1 showed that MgO·Al_(2)O_(3)was formed in the 5 wt.%MgO system with air atmosphere.The solid phase transformation was accompanied by grain coarsening during the isothermal holding process.The differences in the solid phase transformation in different atmosphere of the 5 wt.%MgO system indicated that it was a gas-phase transport grain coarsening mechanism.The enrichment of Al element in the liquid phase region at the grain edges,the homogeneous distribution of Mg element and the disappearance of the liquid phase within the crystal revealed that other MgO content systems were liquid–solid transport grain coarsening mechanism.

关键词： Evolution glassy phase Inclusion Heat treatment MgO·Al_(2)O_(3)

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THE AUTOMATIC CRYSTALLIZATION OF MgO DURING THE SINTERING Si_3N_4-MgO-CeO_2 CERAMICS

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Journal of Wuhan University of Technology(Materials Science) 1996年第2期11卷 52-57页

作者：杨海涛杨国涛袁润章 Wuhan Univ of Technology Wuhan China

The automatic crystallization of MgO during the sintering of Si3N4 —MgO —CeO2 is first discovered. For Si3N4 —MgO —CeO2 ceramics, the MgO—CeO2 would react with SiO2 to form liquid at 1450℃ and then transform into glassy phase in the sintered bodies after cooling down. Above 1550℃, MgO would crystallize automatically during sinter-ing. So the glassy phase which is harmful to the high temper-ature properties is then eliminated. The present work is of great value for theoretical study and application.

关键词： silicon nitride glassy phase crystal- lization

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