Effect of Mg-Al Additive on Microstructure and Properties of SiC-MgAl2O4 Materials
WANG Mengqiang1, CHEN Liugang1, SUN Honggang2,*, DU Yihao2, SI Yaochen3, LI Hongxia1,2,3,*
1 Henan Key Laboratory of High Temperature Functional Ceramics, School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China 2 State Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang 471039, Henan, China 3 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Abstract: In order to explore the chromium-free refractories for coal gasification, SiC-MgAl2O4 materials were prepared using SiC particles and MgAl2O4 powder. Microstructure and properties of the composites with or without 4wt% Mg-Al alloy after heat-treating at temperature range of 500—1 450 ℃ under N2 gas flow were investigated. Explore the formation of low-dimensional phase in nitriding sintering of Mg-Al alloy to improve the performance of SiC-MgAl2O4 composite materials. The results show that the Mg-Al alloy reacted with N2 and O2 at 650—800 ℃, predominantly forming AlN and MgO. Honeycomb-like MgAl2O4 spinel was formed at 700 ℃ enhancing the bonding level between SiC aggregate and MgAl2O4 matrix and thus increasing the mechanical strength of the composites. The honeycomb-like MgAl2O4 spinel changed from honeycomb into rod shape at 900—1 300 ℃, and then into flake and granular MgAlON at 1 300—1 500 ℃. The changes in morphology and phase composition are accompanied by volume expansion, resulting in a slight decrease in the strength of the sample. The addition of Mg-Al alloy can improve the mechanical properties of SiC-MgAl2O4 by in-situ formation of spinel under low heat treatment.
王梦强, 陈留刚, 孙红刚, 杜一昊, 司瑶晨, 李红霞. 镁铝合金添加剂对SiC-MgAl2O4材料显微结构和性能的影响[J]. 材料导报, 2024, 38(16): 23050121-6.
WANG Mengqiang, CHEN Liugang, SUN Honggang, DU Yihao, SI Yaochen, LI Hongxia. Effect of Mg-Al Additive on Microstructure and Properties of SiC-MgAl2O4 Materials. Materials Reports, 2024, 38(16): 23050121-6.
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2024, Vol. 38 
