Microstructure and properties of CrB2-Cr3C2 composite coatings prepared by plasma spraying

Two different CrB2 composite coatings were prepared on TC4 alloy substrates by atmospheric plasma spraying CrB2-Cr3C2 and Cr-B4C composite powders. The microstructure, microhardness, toughness, scratch resistance and wear resistance of the as-prepared CrB2 composite coatings were investigated. The r...

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Bibliographic Details
Published in:Surface & coatings technology 2021-11, Vol.425, p.127693, Article 127693
Main Authors: Wang, Yan-wei, Sun, Xiao-wen, Wang, Lei, Yang, Yong, Ren, Xian-xing, Ma, Yu-duo, Cui, Yu-hang, Sun, Wen-wei, Wang, Xing-yu, Dong, Yan-chun
Format: Article
Language:English
Subjects:
Boron carbide
Chromium borides
CrB2-Cr3C2 coating
Dry sliding wear resistance
Exothermic reactions
Frictional wear
Microhardness
Microstructure
Phase composition
Plasma spraying
Protective coatings
Reaction synthesis
Scratch resistance
Sliding friction
Substrates
Titanium base alloys
Toughness
Wear resistance
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Summary:Two different CrB2 composite coatings were prepared on TC4 alloy substrates by atmospheric plasma spraying CrB2-Cr3C2 and Cr-B4C composite powders. The microstructure, microhardness, toughness, scratch resistance and wear resistance of the as-prepared CrB2 composite coatings were investigated. The results show that the phase composition of the CrB2-Cr3C2 composite coating did not change obviously compared with the composite powder. However, Cr reacted with B4C during the spray process and CrB2, CrB, Cr3C2, Cr7C3 phases were generated. Compared with the CrB2-Cr3C2 composite coating, the Cr-B4C composite coating had uniform microstructure, relatively low porosity, higher hardness and toughness, good scratch resistance and dry sliding wear resistance, which is attributed to the in-situ exothermic reaction between Cr and B4C. •CrB2 composite coating was prepared by plasma spraying Cr-B4C composite powder.•Cr reacted with B4C during plasma spraying and CrB2, CrB, Cr3C2, Cr7C3 were generated.•The in-situ reaction of Cr-B4C had great influence on the properties of coatings.•The mechanical properties of the CrB2-Cr3C2 and Cr-B4C coatings were compared.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2021.127693