Influence of Nickel-Coated Nanostructured WC-Co Powders on Microstructural and Tribological Properties of HVOF Coatings
SCIE
SCOPUS
- Title
- Influence of Nickel-Coated Nanostructured WC-Co Powders on Microstructural and Tribological Properties of HVOF Coatings
- Authors
- Jafari, M; Enayati, MH; Salehi, M; Nahvi, SM; Hosseini, SN; Park, CG
- Date Issued
- 2014-12
- Publisher
- SPRINGER
- Abstract
- In this research, a novel nickel-coated nanostructured WC-12Co powder (Ni/nc-WC) was developed and used as feedstock material for high velocity oxygen fuel process. The Ni/nc-WC powders with average WC grain size of similar to 15 nm were produced by mechanical milling and electroless plating processes. The microstructural and tribological characteristics of Ni/nc-WC coating were investigated and compared with those of microcrystalline WC-12Co (mc-WC) and nanostructured WC-12Co (nc-WC) coatings. X-ray diffractometry, high-resolution field emission scanning electron microscopy, and transmission electron microscopy were used to evaluate the microstructure of the powders and coatings. A ball-on-disk technique was used to probe the wear behavior of the coatings. The Ni/nc-WC coating showed negligible decarburization of similar to 5.4%, while mc-WC and nc-WC coatings suffered from higher decarburization levels of 16.3 and 36.8%. The wear rate of Ni/nc-WC coating was 2.5 x 10(-4) mg/m indicating similar to 75 and 82% increase in wear resistance compared with mc-WC and nc-WC coatings. The wear track analysis of mc-WC and nc-WC coatings showed evidences of delamination mechanism. Besides, a severe carbide pullout mechanism was operative in wear of nc-WC coating. As for Ni/nc-WC coating, individual carbide pullout following the elimination of Ni(Co) matrix was the predominant wear mechanism.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/11211
- DOI
- 10.1007/S11666-014-0171-5
- ISSN
- 1059-9630
- Article Type
- Article
- Citation
- JOURNAL OF THERMAL SPRAY TECHNOLOGY, vol. 23, no. 8, page. 1456 - 1469, 2014-12
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