In-situ synthesis of Mg-α-SiAlON in Mg-α-SiAlON/MgO composites

被引：0
作者：
Liu X. [1 ]
Qu D. [1 ]
Guo Y. [1 ]
机构：
[1] School of High Temperature Material and Magnesite Resources Engineering, University of Science and Technology Liaoning, Anshan
来源：
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2019年 / 36卷 / 03期
关键词：
Composites; Mg-α-SiAlON; MgO; Microstructure; Reaction mechanism;
D O I：
10.13801/j.cnki.fhclxb.20180530.003
中图分类号：
学科分类号：
摘要：
In order to improve the high temperature properties of low grade magnesium-based material, Mg-α-SiAlON/MgO composites were prepared using sintered magnesia, Al metal powder, Si powder and Al2O3 powder as the raw material, the Mg-α-SiAlON phase in-situ forming in the Mg-α-SiAlON/MgO composites sintered at different temperature and mass fraction were determined by XRD, SEM and EDS. The synthesis atmosphere conditions of Mg-α-SiAlON were determined by thermodynamic analysis and the reaction mechanism of Mg-α-SiAlON phase were explained. The experiment results show that the partial pressure of nitrogen and oxygen at 1 550℃ satisfies the thermodynamic requirement for the synthesis of Mg-α-SiAlON. When the total mass fraction of sintered magnesia powder, Al metal powder, Si powder and Al2O3 powder is 40wt%, the content of Mg-α-SiAlON phase with plate-like shape is as high as 32.1% in Mg-α-SiAlON/MgO composites nitrided at 1 550℃ for 3 h. Mg-α-SiAlON phase interlace to form a skeleton and envelope the low melting phase inside of it. The in-situ synthesis of Mg-α-SiAlON/MgO composites from sintered magnesia by nitridation is beneficial for improving the thermal shock resistance of magnesium-based material. © 2019, Editorial Office of Acta Materiae Compositae Sinica. All right reserved.
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页码：677 / 684
页数：7
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