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Preparation and Oxidation resistance of bn-MgAlON Composites by Hot-pressing Sintering

Journal of Iron and Steel Research International 2015年第5期22卷 423-430页

作者： Ran LIU Xin-yuan ZHANG Xing-juan WANG Ya-na QIE Qing L Fu GAO Key Laboratory for Advanced Metallurgy Technology of Ministry of Education Hebei United University College of Metallurgy and Energy Hebei United University

bn-MgA1ON composites were prepared by hot-pressing sintering under nitrogen atmosphere with bn-Mg- A1ON composite powders as raw material and Y2 O3 as sintering additive. Based on thermodynamic analysis, the oxi- dation resistance of bn-mgaion composites was investigated and the dynamics of oxidation process was also ana- lyzed. The oxidation process and the micro-morphology of the samples before and after oxidation were characterized by X-ray diffraction and scanning electron microscopy. The dynamics of oxidation resistance of the bn-MgA1ON composites was investigated via the analysis of the constant temperature oxidation mass gain curves. The results show that the main components of the material are MgA1ON, Sialon, bn and CaYAI3 07 at 1 650--1750 ＊C, and the content of CaYA1307 decreases as the sintering temperature increases. The bn-MgA1ON composites prepared at 1750 ℃ is uniform and compact with the balanced distributions of A1, Mg, O, and N. The oxidation process of bn- MgA1ON composites in air mainly consists of mgaion, Sialon and bn oxidation. The section after being oxidized at 1000--1300 ℃ involves three layers, namely, the outer layer, the middle layer and the inner layer. The oxidation process follows the parabola model. The apparent activation energy of the oxidation process is 2.13 × 10 5 J/mol and the frequency factor is 4.66 × 10 6.

关键词： boron-rich slag carbothermal reduction nitridation hot-pressing sintering bn-mgaion compositeoxidation resistance

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