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Journal of Advanced Ceramics 2020, 9(6): 703-715 https://doi.org/10.1007/s40145-020-0406-5
Research Article | Open Access | Issue | Published: 13 August 2020

Influence of MoSi2 on oxidation protective ability of TaB2-SiC coating in oxygen-containing environments within a broad temperature range

Show Author's Information Xuanru REN( ),  Junshuai LV,  Wei LI,  Yuwen HU,  Ke SUN,  Can MA,  Hong’ao CHU,  Weiguang WANG,  Leihua XU( ),  Ziyu LI,  Peizhong FENG( )
School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, China
Keywords:
MoSi2, TaB2-SiC, coating, liquid phase sintering, compound glass layer, relative oxygen permeability
Cite this article:
REN X, LV J, LI W, et al. Influence of MoSi2 on oxidation protective ability of TaB2-SiC coating in oxygen-containing environments within a broad temperature range. Journal of Advanced Ceramics, 2020, 9(6): 703-715. https://doi.org/10.1007/s40145-020-0406-5
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Abstract Full text About this article

TaB2-SiC coating modified by different content of MoSi2 was fabricated on graphite substrate with SiC inner coating by liquid phase sintering to elevate the anti-oxidation capability of the TaB2-SiC coatings. As compared to the sample with the TaB2-40wt%SiC coating, the coating sample modified with MoSi2 exhibited a weight gain trend at lower temperatures, the fastest weight loss rate went down by 76%, and the relative oxygen permeability value reduced from about 1% to near 0. More importantly, the large amount of SiO2 glass phase produced over the coating during oxidation was in contact with the modification of MoSi2, which was proved to be beneficial to the dispersion of Ta-oxides. A concomitantly formed continuous Ta-Si-O-B compound glass layer showed excellent capacity to prevent oxygen penetration. However, when the TaB2 content was sacrificed to increase the MoSi2 content, the relative oxygen permeability of the coating increased instead of decreased. Thus, on the basis of ample TaB2 content, increasing the MoSi2 content of the coating is conducive to reducing the relative oxygen permeability of the coatings in a broad temperature region.


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About this article

Influence of MoSi2 on oxidation protective ability of TaB2-SiC coating in oxygen-containing environments within a broad temperature range

Show Author's information Xuanru REN( ), Junshuai LV, Wei LI, Yuwen HU, Ke SUN, Can MA, Hong’ao CHU, Weiguang WANG, Leihua XU( ), Ziyu LI, Peizhong FENG( )
School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, China

Abstract

TaB2-SiC coating modified by different content of MoSi2 was fabricated on graphite substrate with SiC inner coating by liquid phase sintering to elevate the anti-oxidation capability of the TaB2-SiC coatings. As compared to the sample with the TaB2-40wt%SiC coating, the coating sample modified with MoSi2 exhibited a weight gain trend at lower temperatures, the fastest weight loss rate went down by 76%, and the relative oxygen permeability value reduced from about 1% to near 0. More importantly, the large amount of SiO2 glass phase produced over the coating during oxidation was in contact with the modification of MoSi2, which was proved to be beneficial to the dispersion of Ta-oxides. A concomitantly formed continuous Ta-Si-O-B compound glass layer showed excellent capacity to prevent oxygen penetration. However, when the TaB2 content was sacrificed to increase the MoSi2 content, the relative oxygen permeability of the coating increased instead of decreased. Thus, on the basis of ample TaB2 content, increasing the MoSi2 content of the coating is conducive to reducing the relative oxygen permeability of the coatings in a broad temperature region.

Keywords: MoSi2, TaB2-SiC, coating, liquid phase sintering, compound glass layer, relative oxygen permeability

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Publication history

Received: 28 March 2020
Revised: 20 June 2020
Accepted: 04 July 2020
Published: 13 August 2020
Issue date: December 2020

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© The Author(s) 2020

Acknowledgements

This work has been supported by the Fundamental Research Funds for the Central Universities (No. 2018GF14).

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