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Fabrication of highly porous TiAl3 intermetallics using titanium hydride as a reactant in the thermal explosion reaction

Published online by Cambridge University Press:  23 August 2018

Xinyang Jiao ,
Peizhong Feng ,
Yanan Liu ,
Xiaoping Cai ,
Jianzhong Wang  and
Tomasz Czujko
Xinyang Jiao
Affiliation:
School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, People’s Republic of China; and School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, People’s Republic of China
Peizhong Feng*
Affiliation:
School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, People’s Republic of China
Yanan Liu
Affiliation:
School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, People’s Republic of China
Xiaoping Cai
Affiliation:
School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, People’s Republic of China
Jianzhong Wang
Affiliation:
State Key Laboratory of Porous Metal Materials, Northwest Institute for Non-ferrous Metal Research, Xian 710016, China
Tomasz Czujko
Affiliation:
Department of Advanced Materials and Technologies, Faculty of Advanced Technologies and Chemistry, Military University of Technology, Warszawa 00-908, Poland
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Porous TiAl3 intermetallics were synthesized by the thermal explosion (TE) reaction from TiH2–75 at.% Al elemental powders combining with carbamide as the space holder. The results showed that the space holder particles were removed completely by dissolving in water before sintering and the violent exothermic reaction occurred from the temperature of 672–1193 °C within a few seconds. After TE, TiAl3 was the dominant phase in sintered products and the open porosity of 60.8% was obtained without space holder, while the porosity considerably increased to 81.4% with the addition of 60 vol% carbamide particles. The pore-forming mechanism can be concluded as follows: the sphere large pores replicated from carbamide particles and the small pores generated by the TE reaction. Moreover, porous TiAl3 intermetallics possess the excellent oxidation resistance at 650 °C in air, which enabled them good candidate materials for improving the service life and the accuracy of filtration under special conditions.

Keywords

combustion synthesisporositymicrostructure
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 18 , 28 September 2018 , pp. 2680 - 2688
Copyright
Copyright © Materials Research Society 2018 

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