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Microstructure and Erosion Properties of HVOF Sprayed Cermet Coatings via Different Feedstock Powders

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Abstract:

In the present study, Cr3C2-NiCr and WC-Co coatings have been deposited using high velocity oxygen-fuel (HVOF) spray technology from five available powders with various bonding phase content or manufacturing process. The microstructure of coatings was observed by scanning electron microscopy (SEM). Microhardness and erosion performance of the coatings were studied. The influence of powder characteristics on the microstructure and erosion performance of coatings was also investigated. The results indicated that an independent bonding phase distributed in the feedstock powder can effectively improve the erosion resistance of Cr3C2-NiCr coatings although the microhardness of the coatings may be lower. Deformation of the free NiCr binder layer in the coating is probably to prevent nucleation and propagation of cracks, which may result in improving the erosion resistance of the coating. Nano WC-Co coatings reached lower erosion resistance than micro WC-Co coatings due to the higher porosity and lower microhardness of nano WC-Co coatings.

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Periodical:

Solid State Phenomena (Volume 281)

Pages:

552-557

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.281.552

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Online since:

August 2018

Authors:

Wei Fu, Qing Yu Chen*, Xiao Chen, Xiao Bo Bai, Hong Tao Wang, Chao Yang, Gang Chang Ji, Hai Long Yao

Keywords:

Coating, Cr3C2- NiCr, Erosion, HVOF, WC-Co

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© 2018 Trans Tech Publications Ltd. All Rights Reserved

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* - Corresponding Author

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