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| Comparison of the Microstructure and Properties of CoCrAlYSi-hBN Coatings Prepared by APS and HVOF Process |
| Received:February 25, 2021 Revised:April 12, 2021 |
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| DOI：10.7643/issn.1672-9242.2021.06.008 |
| KeyWord:APS HVOF CoCrAlYSi-hBN coatings microstructure antifretting wear |
| Author | Institution |
| ZHANG Ang |
Key Laboratory of Advanced Corrosion and Protection for Aviation Materials, AECC Beijing Institute of Aeronautical Materials, Beijing , China |
| WANG Chang-liang |
Key Laboratory of Advanced Corrosion and Protection for Aviation Materials, AECC Beijing Institute of Aeronautical Materials, Beijing , China |
| WANG Tian-ying |
Key Laboratory of Advanced Corrosion and Protection for Aviation Materials, AECC Beijing Institute of Aeronautical Materials, Beijing , China |
| GUO Meng-qiu |
Key Laboratory of Advanced Corrosion and Protection for Aviation Materials, AECC Beijing Institute of Aeronautical Materials, Beijing , China |
| CUI Yong-jing |
Key Laboratory of Advanced Corrosion and Protection for Aviation Materials, AECC Beijing Institute of Aeronautical Materials, Beijing , China |
| TIAN Hao-liang |
Key Laboratory of Advanced Corrosion and Protection for Aviation Materials, AECC Beijing Institute of Aeronautical Materials, Beijing , China |
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| Abstract: |
| To eliminate the fretting wear in a dovetail attachment of a compress blade to a disc, CoCrAlYSi-hBN coatings are fabricated by the atmosphere plasma spray (APS) and high-velocity oxygen fuel (HVOF) spraying process. The microstructure, hardness, bonding strength and wear property are studyed by using scanning electron microscopy (SEM), microhardness tester, adhesive strength measuring and SRV fretting friction wear tester. The coating prepared by APS had a uniformal microstructure with higher content of hBN and pore. However, the coatings prepared by HVOF have a lamellar and dense microstructure with low content of hBN and pore. The hardness and bonding strength of coating prepared by APS is lower than that of coating prepared by HVOF. Although the friction coefficients of coating fabricated by APS is lower than that of coating prepared by HVOF, the coatings prepared by HVOF present a better wear resistance than that prepared by APS. The worn surface of CoCrAlYSi-hBN coatings prepared by APS shows apparent spalling and a little indentation. While the worn surface CoCrAlYSi-hBN coatings prepared by HVOF shows apparent spalling. CoCrAlYSi-hBN coatings have the potential to be used on compressor blades. |
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