Effect of Nano-Al2O3/SiO2 Addition Amount on the Sintering Mechanism of MgO-Al2O3/SiO2 Ceramic Composites
FENG Dong1,2, JIANG Yan1, RU Hongqiang1, LUO Xudong2, ZHANG Guodong2, CAO Yiwei2
1 School of Materials Science and Engineering, Northeastern University, Shenyang 110819; 2 School of High Temperature Materials and Magnesium Resource Engineering, University of Science and Technology Liaoning, Anshan 114051
Abstract: In order to explore the effect of nano-Al2O3/SiO2 addition amount on the mechanism of sintering behavior of MgO-Al2O3-SiO2 composite ceramics, ceramic-matrix composites were prepared from micron-sized MgO, nano-sized Al2O3 and nano-sized SiO2 as the main raw material. The phase composition and microstructure of sintered samples were characterized by X-ray diffraction and scanning electron microscopy, respectively. Effects of Al2O3/SiO2 addition amount on the phase composition, microstructure and sintering properties of composite ceramics were mainly investigated. The results showed that the relative density and linear dimension change rate of the sintered sample firstly increased, then decreased and then increased with increasing Al2O3/SiO2 addition amount. The relative density of the sample introduced with 15% Al2O3/SiO2 sintered 1 500 ℃ reached 94%. The magnesium aluminate spinel and forsterite formed by solid reaction including Al2O3, SiO2 addition, and the MgO itself. Meanwhile, in-situ reaction coupled with a volumetric expansion, it could offset part of the volumetric shrinkage caused by the sintering process. The cordierite phase was formed in the matrix when the sample introduced with 75wt% Al2O3/SiO2 sintered 1 400 ℃. The high temperature liquid phase decomposed from cordierite calcined at 1 500 ℃ and promoted the sintering shrinkage of the sintered sample.
1 Yue D D, Li Y, Ma J J, et al. Effects of aluminum powder on composition of alumina-periclase refractory[J].Journal of the Chinese Ceramic Society,2017,45(3):446(in Chinese). 岳丹丹,李勇,马佳佳,等.添加铝粉对Al2O3-MgO耐火材料物相组成的影响[J].硅酸盐学报,2017,45(3):446. 2 Wang Z, Xu H, Chen K, et al. Research on properties of thermal conductive PA6/MgO composites[J].Materials Review,2017,31(z1):420(in Chinese). 王哲,徐徽,陈康,等.PA6/MgO导热复合材料的性能研究[J].材料导报,2017,31(z1):420. 3 Feng D, Luo X, Zhang G, et al. Effect of molar ratios of MgO/Al2O3, on the sintering behavior and thermal shock resistance of MgO-Al2O3-SiO2, composite ceramics[J].Materials Chemistry & Physics,2017,185:1. 4 Selvam N C S, Kumar R T, Kennedy L J, et al. Comparative study of microwave and conventional methods for the preparation and optical properties of novel MgO-micro and nano-structures[J].Journal of Alloys & Compounds,2011,509(41):9809. 5 Ehre D, Gutmanas E Y, Chaim R. Densification of nanocrystalline MgO ceramics by hot-pressing[J].Journal of the European Ceramic Society,2005,25(16):3579. 6 Sun H, Zhang Y, Gong H, et al. Microwave sintering and kinetic analysis of Y2O3-MgO composites[J].Ceramics International,2014,40(7):10211. 7 Han B, Li Y, Guo C, et al. Sintering of MgO-based refractories with added WO3[J].Ceramics International,2007,33(8):1563. 8 Zhang C, Zhang Z P, Zhang R J, et al. Optimization for preparation of high density MgO ceramics[J].Rare Metal Materials and Engineering,2011(s1):227(in Chinese). 张骋,张展鹏,张荣娟,等.高致密氧化镁陶瓷制备工艺优化[J].稀有金属材料与工程,2011(s1):227. 9 Yu M, Luo X D, Zhang G D, et al. Effect of Al2O3 on sintering and thermal shock resistance of MgO ceramic[J].Journal of Synthetic Crystals,2017,46(3):507. 10 Li M, Zhou N, Luo X, et al. Effects of doping Al2O3/2SiO2, on the structure and properties of magnesium matrix ceramic[J].Materials Chemistry & Physics,2016,175:6. 11 Luo X D, Qu D L, Zhang G D, et al. Structure characterization of cordierite synthesized from decomposed magnesite pyrophyllite [J].Chinese Journal of Inorganic Chemistry,2011,27(3):434(in Chinese). 罗旭东,曲殿利,张国栋,等.菱镁矿风化石与叶腊石合成堇青石的结构表征[J].无机化学学报,2011,27(3):434. 12 Zhang P X, Gao L, Yuan Q H, et al. Crystallization behavior and performance of MgO-Al2O3-SiO2 glass-ceramics by sintering[J].Advanced Materials Research,2010,92:65. 13 Xie Y, Chen Z, Wu Y, et al. Activated sintering of activated carbon-doped magnesia[J].Ceramics International,2014,40(10):16543. 14 Luo X D, Qu D L, Zhang G D. Influence of Zr4+ on phasetransition of cordierite material prepared by soild reaction[J].Chinese Journal of Inorganic Chemistry,2012,28(4):745(in Chinese). 罗旭东,曲殿利,张国栋.Zr4+寸固相反应制备堇青石材料晶相转变的影响[J].无机化学学报,2012,28(4):745. 15 Hashimoto S, Honda S, Hiramatsu T, et al. Fabrication of porous spinel (MgAl2O4) from porous alumina using a template method[J].Ceramics International,2013,39(2):2077. 16 Sinhamahapatra S, Dana K, Ghosh A, et al. Dynamic thermal study to rationalise the role of titania in reaction sintering of magnesia-alumina system[J].Ceramics International,2015,41(1):1073.
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2018, Vol. 32 
