The role of MgSiN2 during the sintering process of silicon nitride ceramic |
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| Authors: | Zhen-hua Liang Jun Li Liu-cheng Gui Gui-hua Peng Zhao Zhang Guo-jian Jiang |
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| Affiliation: | 1. State Key Laboratory Cultivation Base for the Chemistry and Molecular Engineering of Medicinal Resources, Ministry of Science and Technology of China, School of Chemistry & Chemical Engineering of Guangxi Normal University, Guilin, Guangxi 541004, China;2. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;3. Shanghai Institute of Technology, Shanghai 200050, China |
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| Abstract: | The reaction process between MgSiN2 SiO2 and Si3N4 was investigated by analyzing the composition change of the powder mixture of 61 wt% MgSiN2, 34 wt% SiO2 and 5 wt% α-Si3N4 after heat treatment at different temperatures. The phase and chemical compositions of the grain boundary phase in the silicon nitride ceramic was analyzed by x-ray diffraction, transmission electron microscope, and energy-dispersive x-ray spectroscopy. The results demonstrated that MgSiN2 reacted with the surface silica and Si3N4 to form Mg–Si–O–N liquid phase, which promoted the consolidation densification of silicon nitride powders through liquid-phase sintering mechanism. The amount of Mg–Si–O–N glass boundary phase using MgSiN2 as additives is much less than that using the same amount of MgO additive, owing to the lower oxygen concentration and higher nitrogen content. |
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