The microstructure and properties of CoCrAlYSi-hBN coating prepared by HVOF

ZHANG Ang; WANG Changliang; WANG Tianying; GAO Junguo; GUO Mengqiu; CUI Yongjing; TIAN Haoliang

doi:10.11868/j.issn.1005-5053.2020.000021

Journal of Aeronautical Materials (Oct 2020)

The microstructure and properties of CoCrAlYSi-hBN coating prepared by HVOF

ZHANG Ang,
WANG Changliang,
WANG Tianying,
GAO Junguo,
GUO Mengqiu,
CUI Yongjing,
TIAN Haoliang

Affiliations

ZHANG Ang: Key Laboratory of Advanced Corrosion and Protection for Aviation Materials，AECC Beijing Institute of Aeronautical Materials，Beijing 100095，China
WANG Changliang: Key Laboratory of Advanced Corrosion and Protection for Aviation Materials，AECC Beijing Institute of Aeronautical Materials，Beijing 100095，China
WANG Tianying: Key Laboratory of Advanced Corrosion and Protection for Aviation Materials，AECC Beijing Institute of Aeronautical Materials，Beijing 100095，China
GAO Junguo: Key Laboratory of Advanced Corrosion and Protection for Aviation Materials，AECC Beijing Institute of Aeronautical Materials，Beijing 100095，China
GUO Mengqiu: Key Laboratory of Advanced Corrosion and Protection for Aviation Materials，AECC Beijing Institute of Aeronautical Materials，Beijing 100095，China
CUI Yongjing: Key Laboratory of Advanced Corrosion and Protection for Aviation Materials，AECC Beijing Institute of Aeronautical Materials，Beijing 100095，China
TIAN Haoliang: Key Laboratory of Advanced Corrosion and Protection for Aviation Materials，AECC Beijing Institute of Aeronautical Materials，Beijing 100095，China

DOI: https://doi.org/10.11868/j.issn.1005-5053.2020.000021
Journal volume & issue: Vol. 40, no. 5
pp. 53 – 59

Abstract

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CoCrAlYSi-hBN coating was fabricated using the high-velocity oxygen fuel (HVOF) process under several processing conditions， and the effects of process parameters, gas flow and spray distance, on the microstructure and properties of the coating were investigated in the present paper. The microstructure, hardness, bonding strength and chemical composition of the coating was researched by using scanning electronmicroscopy (SEM), microhardness tester, adhesive strength measuring and energy dispersive spectroscopy (EDS). The results show that with the increasing gas flow, the porosity and h-BN content of the coating are reduced, and the hardness is improved; However, the bonding strength increases first and then decreases due to excessive energy leading serious oxidation. With the increase of spraying distance, the oxide inclusions are increased, which causes the hardness of coatings increase and the bonding strength decrease. In addition, when the spraying distance is 225 mm, the hardness and bonding strength of the coating are the highest due to the low porosity and boron nitride content.

Published in Journal of Aeronautical Materials

ISSN: 1005-5053 (Print)
Publisher: Journal of Aeronautical Materials
Country of publisher: China
LCC subjects: Technology: Motor vehicles. Aeronautics. Astronautics
Website: http://jam.biam.ac.cn/indexen.htm

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