纳米-Al2O3/SiO2加入量对MgO-Al2O3-SiO2复相陶瓷烧结机理的影响

doi:10.11896/j.issn.1005-023X.2018.24.007

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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.

Key words： MgO Al₂O₃/SiO₂ ceramic-matrix composites sintering behavior

Published: 23 January 2019

CLC number:

TQ174.74

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	Articles by authors
	FENG Dong
	JIANG Yan
	RU Hongqiang
	LUO Xudong
	ZHANG Guodong
	CAO Yiwei

Cite this article:

FENG Dong,JIANG Yan,RU Hongqiang, et al. Effect of Nano-Al₂O₃/SiO₂ Addition Amount on the Sintering Mechanism of MgO-Al₂O₃/SiO₂ Ceramic Composites[J]. Materials Reports, 2018, 32(24): 4248-4252.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.24.007 OR http://www.mater-rep.com/EN/Y2018/V32/I24/4248

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