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Research Article | Open Access

In-situ synthesis, microstructure, and properties of NbB2-NbC-Al2O3 composite coatings by plasma spraying

Xiaolong WANGa, Yong YANGa( ), Shitong JIAa, Yanwei WANGa, Yuduo MAa, Yuhang CUIa, Xingyu WANGa, Wenwei SUNa, Liang WANGb
Key Lab. for New Type of Functional Materials in Hebei Province, School of Materials Science and Engineering, State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Hebei University of Technology, Tianjin 300401, China
Integrated Computational Materials Research Centre, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China
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Abstract

The high melting point and strong chemical bonding of NbB2 pose a great challenge to the preparation of high-density nanostructured NbB2 composite coating. Herein, we report a novel, simple, and efficient method to fabricate in-situ NbB2-NbC-Al2O3 composite coating by plasma spraying Nb2O5-B4C-Al composite powder, aiming at realizing the higher densification and ultra-fine microstructure of NbB2 composite coating. The microstructure and properties of in-situ NbB2-NbC- Al2O3 composite coating were studied comparatively with ex-situ NbB2-NbC-Al2O3 composite coating (plasma spraying NbB2-NbC-Al2O3 composite powder). The reaction mechanism of Nb2O5-B4C-Al composite powder in plasma jet was analyzed in detail. The results showed that the in-situ nanostructured NbB2-NbC-Al2O3 composite coating presented a lower porosity and superior performance including higher microhardness, toughness and wear resistance compared to the plasma sprayed ex-situ NbB2-NbC-Al2O3 coating and other boride composite coatings. Densification of the in-situ NbB2-NbC-Al2O3 coating was attributed to the low melting point of Nb2O5-B4C-Al composite powder and the exothermic effect of in-situ reaction. The superior performance was ascribed to the density improvement and the strengthening and toughening effect of the nanosized phases. The in-situ reaction path could be expressed as: Nb2O5+Al→Nb+Al2O3, and Nb+B4C→NbB2+NbC.

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Keywords

NbB2-NbC-Al2O3 composite coatingplasma sprayin-situ synthesisNb2O5-B4C-Al system

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Journal of Advanced Ceramics
Volume 11 Issue 8,
August 2022
Pages 1263-1278
DOI: 10.1007/s40145-022-0608-0

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WANG X, YANG Y, JIA S, et al. In-situ synthesis, microstructure, and properties of NbB2-NbC-Al2O3 composite coatings by plasma spraying. Journal of Advanced Ceramics, 2022, 11(8): 1263-1278. https://doi.org/10.1007/s40145-022-0608-0

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Received: 23 September 2021
Revised: 18 April 2022
Accepted: 29 April 2022
Published: 15 June 2022
© The Author(s) 2022.

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