Cracking behaviour and mechanism at grain boundary of gibbsite during calcination

Zhang, Jinxuan and Ge, Lei ORCID: https://orcid.org/0000-0003-2989-0329 and Chen, Zhi-Gang ORCID: https://orcid.org/0000-0002-9309-7993 and Zhu, Zhonghua (2020) Cracking behaviour and mechanism at grain boundary of gibbsite during calcination. Ceramics International, 46. pp. 12067-12072. ISSN 0272-8842


Abstract

Limiting the cracking of gibbsites during calcination can reduce the content of ultrafine particles in the smelter grade alumina product and increase the quality of products. However, the investigation on the cracking behaviour and mechanism of gibbsites during calcination remains a challenge. In this study, we focus on the cracking behaviour and mechanism of gibbsite grain boundary during calcination. We first observe the cracking behaviour of the gibbsite grain boundary during calcination and propose a cracking mechanism. Based on the observed crack evolution at the gibbsite grain boundary, we found that the cracking of gibbsite grain boundary is initiated on the surface of particles, and then the cracks grow into the inner side of particles with the calcination. We also investigate the impact of the crystallite size and the c-axis angle between crystallites on gibbsite grain boundary. As a result, the increased crystallite size and the c-axis angle between crystallites can result in increased crack size at the gibbsite grain boundary.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 13 Jul 2020 02:14
Last Modified: 27 Jul 2020 01:06
Uncontrolled Keywords: Gibbsite grain boundary; Calcination; Cracking behaviour; Cracking mechanism
Fields of Research (2008): 09 Engineering > 0904 Chemical Engineering > 090406 Powder and Particle Technology
09 Engineering > 0912 Materials Engineering > 091201 Ceramics
Socio-Economic Objectives (2008): B Economic Development > 86 Manufacturing > 8611 Basic Metal Products (incl. Smelting, Rolling, Drawing and Extruding) > 861101 Basic Aluminium Products
Identification Number or DOI: https://doi.org/10.1016/j.ceramint.2020.01.248
URI: http://eprints.usq.edu.au/id/eprint/38558

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