Oxidation behavior of high-entropy carbide (Hf0.2Ta0.2Zr0.2Ti0.2Nb0.2)C at 1400–1600 °C

Haoxuan Wang; Xu Han; Wen Liu; Yiguang Wang

doi:10.1016/j.ceramint.2020.12.201

Oxidation behavior of high-entropy carbide (Hf_0.2Ta_0.2Zr_0.2Ti_0.2Nb_0.2)C at 1400–1600 °C

Haoxuan Wang
, Xu Han^*
, Wen Liu
, Yiguang Wang^*

^*Corresponding author for this work

Northwestern Polytechnical University Xian
Zhengzhou University
Beijing Institute of Technology

Research output: Contribution to journal › Article › peer-review

92 Citations (Scopus)

Abstract

Oxidation behavior of high-entropy carbide (Hf_0.2Ta_0.2Zr_0.2Ti_0.2Nb_0.2)C (HTZTNC) was investigated over temperature range of 1400–1600 °C. Results showed improved oxidation resistance of high-entropy carbide compared with individual carbide ceramics. In oxide layer, Ta₂O₅ and Nb₂O₅ were found to be dominant phases at 1400 °C, whereas ZrTiO₄ and HfTiO₄ were main phases obtained at 1500 and 1600 °C. Moreover, these complex dense oxide layer structures on the surface of HTZTNC at high temperature led to excellent oxidation resistance. The observation of Ti-depleted layer at 1500 and 1600 °C after 20 min of oxidation indicated that oxidation mechanism involved outward diffusion of titanium oxide, which was further confirmed by reoxidation experiments. In sum, these findings are promising for future development of high-entropy ultrahigh temperature ceramics with good oxidation resistance.

Original language	English
Pages (from-to)	10848-10854
Number of pages	7
Journal	Ceramics International
Volume	47
Issue number	8
DOIs	https://doi.org/10.1016/j.ceramint.2020.12.201
Publication status	Published - 15 Apr 2021
Externally published	Yes

Keywords

High-entropy carbide
Outward diffusion
Oxidation resistance
Titanium-depleted layer

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10.1016/j.ceramint.2020.12.201

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@article{2ef1ff330b4444d99dee034ed909fbd7,

title = "Oxidation behavior of high-entropy carbide (Hf0.2Ta0.2Zr0.2Ti0.2Nb0.2)C at 1400–1600 °C",

abstract = "Oxidation behavior of high-entropy carbide (Hf0.2Ta0.2Zr0.2Ti0.2Nb0.2)C (HTZTNC) was investigated over temperature range of 1400–1600 °C. Results showed improved oxidation resistance of high-entropy carbide compared with individual carbide ceramics. In oxide layer, Ta2O5 and Nb2O5 were found to be dominant phases at 1400 °C, whereas ZrTiO4 and HfTiO4 were main phases obtained at 1500 and 1600 °C. Moreover, these complex dense oxide layer structures on the surface of HTZTNC at high temperature led to excellent oxidation resistance. The observation of Ti-depleted layer at 1500 and 1600 °C after 20 min of oxidation indicated that oxidation mechanism involved outward diffusion of titanium oxide, which was further confirmed by reoxidation experiments. In sum, these findings are promising for future development of high-entropy ultrahigh temperature ceramics with good oxidation resistance.",

keywords = "High-entropy carbide, Outward diffusion, Oxidation resistance, Titanium-depleted layer",

author = "Haoxuan Wang and Xu Han and Wen Liu and Yiguang Wang",

note = "Publisher Copyright: {\textcopyright} 2020 Elsevier Ltd and Techna Group S.r.l.",

year = "2021",

month = apr,

day = "15",

doi = "10.1016/j.ceramint.2020.12.201",

language = "English",

volume = "47",

pages = "10848--10854",

journal = "Ceramics International",

issn = "0272-8842",

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TY - JOUR

T1 - Oxidation behavior of high-entropy carbide (Hf0.2Ta0.2Zr0.2Ti0.2Nb0.2)C at 1400–1600 °C

AU - Wang, Haoxuan

AU - Han, Xu

AU - Liu, Wen

AU - Wang, Yiguang

PY - 2021/4/15

Y1 - 2021/4/15

N2 - Oxidation behavior of high-entropy carbide (Hf0.2Ta0.2Zr0.2Ti0.2Nb0.2)C (HTZTNC) was investigated over temperature range of 1400–1600 °C. Results showed improved oxidation resistance of high-entropy carbide compared with individual carbide ceramics. In oxide layer, Ta2O5 and Nb2O5 were found to be dominant phases at 1400 °C, whereas ZrTiO4 and HfTiO4 were main phases obtained at 1500 and 1600 °C. Moreover, these complex dense oxide layer structures on the surface of HTZTNC at high temperature led to excellent oxidation resistance. The observation of Ti-depleted layer at 1500 and 1600 °C after 20 min of oxidation indicated that oxidation mechanism involved outward diffusion of titanium oxide, which was further confirmed by reoxidation experiments. In sum, these findings are promising for future development of high-entropy ultrahigh temperature ceramics with good oxidation resistance.

AB - Oxidation behavior of high-entropy carbide (Hf0.2Ta0.2Zr0.2Ti0.2Nb0.2)C (HTZTNC) was investigated over temperature range of 1400–1600 °C. Results showed improved oxidation resistance of high-entropy carbide compared with individual carbide ceramics. In oxide layer, Ta2O5 and Nb2O5 were found to be dominant phases at 1400 °C, whereas ZrTiO4 and HfTiO4 were main phases obtained at 1500 and 1600 °C. Moreover, these complex dense oxide layer structures on the surface of HTZTNC at high temperature led to excellent oxidation resistance. The observation of Ti-depleted layer at 1500 and 1600 °C after 20 min of oxidation indicated that oxidation mechanism involved outward diffusion of titanium oxide, which was further confirmed by reoxidation experiments. In sum, these findings are promising for future development of high-entropy ultrahigh temperature ceramics with good oxidation resistance.

KW - High-entropy carbide

KW - Outward diffusion

KW - Oxidation resistance

KW - Titanium-depleted layer

UR - https://www.scopus.com/pages/publications/85098530582

U2 - 10.1016/j.ceramint.2020.12.201

DO - 10.1016/j.ceramint.2020.12.201

M3 - Article

AN - SCOPUS:85098530582

SN - 0272-8842

VL - 47

SP - 10848

EP - 10854

JO - Ceramics International

JF - Ceramics International

IS - 8

ER -

Oxidation behavior of high-entropy carbide (Hf_0.2Ta_0.2Zr_0.2Ti_0.2Nb_0.2)C at 1400–1600 °C

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Keywords

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