氧化钴掺杂对溶胶凝胶法合成莫来石微观结构和烧结性能的影响

doi:10.11896/cldb.19120033

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Abstract Mullite precursor powders were prepared by a sol-gel method by using aluminum nitrate nonahydrate and ethyl orthosilicate as raw materials, as pH value of reaction solution is about 8. The effect of cobalt oxide addition on the phase compositions and densification of mullite cera-mics obtained by sintering of mullite precursor were investigated. The results show that the formation temperature of mullite was significantly reduced, and it was about 100 ℃ lower than that of the sample without cobalt oxide addition. The sinterability of mullite precursors prepared by sol-gel method shows that the densification rate of the sample with cobalt oxide is faster than that of the sample without cobalt oxide. The maximum bulk density of the sample can reach to 2.912 g/cm³, as the mullite precursors with 10wt% cobalt oxide addition were sintered at the temperature of 1 400 ℃ for 2 h. And a large number of needle-like mullite grains with the ratio of length to diameter of ~14 were obtained in the sample. Needle-like mullite grains interweave with each other to form a dense network structure. The effect of cobalt oxide addition on the phase compositions and densification behavior of mullite ceramics maybe attributed to Al³⁺ in mullite [AlO₆] octahedron structure may be replaced by Co²⁺, which cause its grain lattice distortion and activate its grain lattice. And mullite was formed and sintered at the lower sintering temperature.

Key words： cobalt oxide mullite sol-gel method sinterability

Published: 24 December 2020

CLC number:

TQ174.1

Fund:This work was financially supported by the Natural Science Foundation of China(11872001), the Key Technologies R&D Program of Anhui Province (17030901091), the Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province (JH201840).

About author:: Zhenying Liu, associate professor, master tutor, focusing on the research of ceramic matrix composites and functional ceramics.
Yin Liu, professor, master tutor, focusing on the research of nanomaterials, magnetic materials, ceramics, synthesis and properties of functional materials powders.

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	LIU Zhenying
	ZHU Jinbo
	LIU Yin
	XUE Changguo
	JIANG Yuena

Cite this article:

LIU Zhenying,ZHU Jinbo,LIU Yin, et al. Effect of Cobalt Oxide Addition on the Microstructure and Sinterability of Mullite Synthesized by Sol-gel Method[J]. Materials Reports, 2020, 34(24): 24005-24009.

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http://www.mater-rep.com/EN/10.11896/cldb.19120033 OR http://www.mater-rep.com/EN/Y2020/V34/I24/24005

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