Performance evaluation of HVOF sprayed WC-10Co4Cr coatings under slurry erosion

Surface Engineering - Tập 35 Số 9 - Trang 816-825 - 2019
Xiaobin Liu1, Jiajie Kang2,3,1, Wen Yue3,1, Zhiqiang Fu3,1, Lina Zhu3,1, Dingshun She3,1, Jian Liang4,1, Peng Wang3,1
1School of Engineering and Technology, China University of Geosciences, Beijing, People’s Republic of China
2Key Laboratory of Deep Geodrilling Technology, Ministry of Land and Resources, Beijing, People’s Republic of China
3National International Joint Research Center of Deep Geodrilling Equipment, Beijing, People's Republic of China
4Institute of Exploration Techniques, Chinese Academy of Geological Sciences, Langfang, People’s Republic of China

Tóm tắt

Slurry erosion is one of the main failure modes of the hydraulic turbine parts, mud pumps and drill pipes. The high velocity oxygen fuel (HVOF) spray process has been widely used for depositing protective coatings especially the cermet coatings that can significantly improve the slurry erosion resistance of substrate materials. In this work, conventional WC-10Co4Cr composite coatings and coatings with bimodal structures were deposited on the 35CrMo steel substrate by HVOF, respectively. Structures of the two kinds of coatings were analysed with SEM and XRD methods, and microhardness, porosity and roughness were also measured. Furthermore, the slurry erosion tests were carried out on the coatings to explore the effect of average particle size, slurry concentration and pH value on the erosion behaviours. The erosion failure mechanisms of the coatings were also explored. The results show that the bimodal coating has a denser microstructure, superior mechanical properties, lower porosity and better slurry erosion resistance than the conventional coating. The erosion-corrosion mechanism of the two kinds of coatings is spalling, caused by crack initiation and propagation under fatigue stress.

Từ khóa


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Thông tin xuất bản

Surface Engineering

Tập 35 Số 9

816-825

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