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Multi-component solid solutions with non-stoichiometric compositions are characteristics of ultra-high temperature carbides as promising materials for hypersonic vehicles. However, for group IV transition-metal carbides, the oxidation behavior of multi-component non-stoichiometric (Zr,Hf,Ti)Cx carbide solid solution has not been clarified yet. The present work fabricated four kinds of (Zr,Hf,Ti)Cx carbide solid solution powders by free-pressureless spark plasma sintering to investigate the oxidation behavior of (Zr,Hf,Ti)Cx in air. The effects of metallic atom composition on oxidation resistance were examined. The results indicate that the oxidation kinetics of (Zr,Hf,Ti)Cx are composition dependent. A high Hf content in (Zr,Hf,Ti)Cx was beneficial to form an amorphous Zr-Hf-Ti-C-O oxycarbide layer as an oxygen barrier to enhance the initial oxidation resistance. Meanwhile, an equiatomic ratio of metallic atoms reduced the growth rate of (Zr,Hf,Ti)O2 oxide, increasing its phase stability at high temperatures, which improved the oxidation activation energy of (Zr,Hf,Ti)Cx.


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Oxidation behavior of non-stoichiometric (Zr,Hf,Ti)Cx carbide solid solution powders in air

Show Author's information Huilin LUNaYi ZENGa( )Xiang XIONGaZiming YEaZhongwei ZHANGb( )Xingchao LIcHaikun CHENcYufeng LIUa,c
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, China
Science and Technology of Advanced Functional Composites Laboratory, Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China

Abstract

Multi-component solid solutions with non-stoichiometric compositions are characteristics of ultra-high temperature carbides as promising materials for hypersonic vehicles. However, for group IV transition-metal carbides, the oxidation behavior of multi-component non-stoichiometric (Zr,Hf,Ti)Cx carbide solid solution has not been clarified yet. The present work fabricated four kinds of (Zr,Hf,Ti)Cx carbide solid solution powders by free-pressureless spark plasma sintering to investigate the oxidation behavior of (Zr,Hf,Ti)Cx in air. The effects of metallic atom composition on oxidation resistance were examined. The results indicate that the oxidation kinetics of (Zr,Hf,Ti)Cx are composition dependent. A high Hf content in (Zr,Hf,Ti)Cx was beneficial to form an amorphous Zr-Hf-Ti-C-O oxycarbide layer as an oxygen barrier to enhance the initial oxidation resistance. Meanwhile, an equiatomic ratio of metallic atoms reduced the growth rate of (Zr,Hf,Ti)O2 oxide, increasing its phase stability at high temperatures, which improved the oxidation activation energy of (Zr,Hf,Ti)Cx.

Keywords:

ultra-high temperature ceramics (UHTCs), (Zr,Hf,Ti)Cx carbides, oxidation behavior, oxidation resistance, free-pressureless spark plasma sintering
Received: 06 November 2020 Revised: 08 February 2021 Accepted: 03 March 2021 Published: 05 August 2021 Issue date: August 2021
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Publication history

Received: 06 November 2020
Revised: 08 February 2021
Accepted: 03 March 2021
Published: 05 August 2021
Issue date: August 2021

Copyright

© The Author(s) 2021

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 51602349 and 5207021797), the Fundamental Research Funds for the Central Universities, the Key Research and Development (R&D) Program in Hunan Province Science and Technology Department (No. 2018GK2061), and the Innovation-drive Project of Central South University.

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