Microstructure and properties of Co-Al porous intermetallics fabricated by thermal explosion reaction

Kang, Xueqin, Qiao, Lei, Zhang, Haifei ORCID: 0000-0001-5142-5824, Wang, Jianzhong and Feng, Peizhong (2021) Microstructure and properties of Co-Al porous intermetallics fabricated by thermal explosion reaction. HIGH TEMPERATURE MATERIALS AND PROCESSES, 40 (1). pp. 141-150.

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Official URL: http://dx.doi.org/10.1515/htmp-2020-0076

Abstract

<jats:title>Abstract</jats:title> <jats:p>Co–Al porous intermetallics were fabricated by an efficient and energy-saving method of thermal explosion (TE) reactions. The effects of Co/Al molar ratios on the temperature profiles, phase compositions, expansion behaviors, density, pore characteristics, and oxidation resistance were investigated. When the target furnace temperature was set at 700°C, there was an obvious exothermic peak in the temperature profiles. The ignition temperatures were in the range of 600–645°C, and the combustion temperatures were in the range of 984–1,421°C. Co–Al porous intermetallics had the open porosity of 27–43%, and the pores were from nonfully dense green compacts and explosion behaviors of TE. The specimen with Co:Al = 2:9 possessed a higher open porosity of 42.8%, the lowest density of 1.86 g cm<jats:sup>−3</jats:sup>, and the largest volume expansion of 76.7%. The porous specimens with Co:Al = 1:1 possessed the highest open porosity of 43.2%, the lowest volume expansion of 12.3%, and the highest density of 3.42 g cm<jats:sup>−3</jats:sup>. All Co–Al porous intermetallics showed excellent oxidation resistance at 650°C in air, especially the specimen with Co:Al = 1:1 had the highest oxidation resistance.</jats:p>

Item Type:	Article
Uncontrolled Keywords:	porous materials, intermetallics, powder metallurgy, thermal explosion
Divisions:	Faculty of Science and Engineering > School of Physical Sciences
Depositing User:	Symplectic Admin
Date Deposited:	27 Oct 2021 10:59
Last Modified:	18 Jan 2023 21:25
DOI:	10.1515/htmp-2020-0076
Open Access URL:	https://www.degruyter.com/document/doi/10.1515/htm...
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3141828