Effect of Al(OH)3 addition on densification mechanism and properties of reaction-sintered mullite-corundum composite ceramics

IF 2.2 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Asian Ceramic Societies Pub Date : 2022-09-21 DOI:10.1080/21870764.2022.2114145

Zhenying Liu, N. Xie, Hanxin Zhang, Shouwu Huang, Chongmei Wu, Shuhuan He, Jinbo Zhu, Yin Liu

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引用次数: 2

Abstract

ABSTRACT Mullite composite ceramics were fabricated by using mullite powder from waste coal gangue and Al(OH)3 as starting materials. The effects of sintering temperature and Al(OH)3 content on phase composition, microstructure, and mechanical properties of the ceramics were systematically investigated. Results show that the bulk density and flexural strength of composite ceramics increase as the temperature increases from 1480°C to 1560°C. The composite ceramics exhibit optimal performances with addition of 10 wt.% Al(OH)3 at 1560°C, a bulk density of 2.43 g/cm3 and a flexural strength of 124.28 MPa, respectively. Moreover, additional Al(OH)3 promotes a reaction between SiO2 and Al2O3 and forms more mullite phase. The increase in mullite content endows the composite ceramics with high mechanical properties. Scanning electron microscope images indicate that the mullite particles exhibit an interlocking structure, while the corundum phase is “pinned” within the mullite interlocking structure, contributing to the mechanical properties of composite ceramics.

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Al（OH）3对反应烧结莫来石-刚玉复合陶瓷致密化机理及性能的影响

摘要以废弃煤矸石和Al（OH）3为原料，制备了莫来石复合陶瓷。系统地研究了烧结温度和Al（OH）3含量对陶瓷相组成、微观结构和力学性能的影响。结果表明，复合陶瓷的体积密度和弯曲强度随着温度从1480°C升高到1560°C而增加。在1560°C下添加10wt.%Al（OH）3，体积密度为2.43g/cm3，弯曲强度为124.28MPa，复合陶瓷表现出最佳性能。此外，额外的Al（OH）3促进SiO2和Al2O3之间的反应并形成更多的莫来石相。莫来石含量的增加使复合陶瓷具有较高的力学性能。扫描电子显微镜图像表明，莫来石颗粒呈现出互锁结构，而刚玉相被“钉扎”在莫来石互锁结构中，有助于复合陶瓷的力学性能。

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来源期刊

Journal of Asian Ceramic Societies Materials Science-Ceramics and Composites

CiteScore

5.00

自引率

4.30%

发文量

审稿时长

10 weeks

期刊介绍： The Journal of Asian Ceramic Societies is an open access journal publishing papers documenting original research and reviews covering all aspects of science and technology of Ceramics, Glasses, Composites, and related materials. These papers include experimental and theoretical aspects emphasizing basic science, processing, microstructure, characteristics, and functionality of ceramic materials. The journal publishes high quality full papers, letters for rapid publication, and in-depth review articles. All papers are subjected to a fair peer-review process.