期刊
APPLIED SURFACE SCIENCE
卷 416, 期 -, 页码 33-44出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.04.132
关键词
WC; Cr3C2; HVOF; Wear; High temperature
类别
资金
- Natural Science Foundation of Guangdong Province [2016A030312015]
- Guangdong Science and Technology Programming [2013B050800031, 2014B050502008, 2015B07070124]
A novel Cr3C2-WC-NiCoCrMo and commercial Cr3C2-NiCr thermal spray-grade powders with particle size of -45 + 15 mu m were prepared by an agglomeration and sintering process. Cr3C2-WC-NiCoCrMo and Cr3C2-NiCr coatings were deposited by high velocity oxygen fuel (HVOF) spraying. The fundamental properties of both coatings were evaluated and friction wear test against Al2O3 counterbodies of both coatings at high temperatures (450 degrees C, 550 degrees C, 650 degrees C) were carried out ball-on-disk high temperature tribometer. All specimens were characterized by optical microscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy with energy dispersive spectroscopy (SEM/EDS) and 3D non-contact surface mapping profiler. The results have shown that the Cr3C2-WC-NiCoCrMo coating exhibited lower porosity, higher micro-hardness compared to the Cr3C2-NiCr coating. The Cr3C2-WC-NiCoCrMo coating also exhibited better wear resistance and higher friction coefficient compared to the Cr3C2-NiCr coating when sliding against the Al2O3 counterpart. Wear rates of both coatings increased with raising temperature. Both coatings experienced abrasive wear; hard phase particles (WC and Cr3C2) with different sizes, distributed in the matrix phase, will effectively improve the resistance against wear at high temperatures. (C) 2017 Elsevier B.V. All rights reserved.
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