Improvement in tribological properties of HVOF sprayed WC–Co coatings using electroless Ni–P coated feedstock powders
SCIE
SCOPUS
- Title
- Improvement in tribological properties of HVOF sprayed WC–Co coatings using electroless Ni–P coated feedstock powders
- Authors
- Jafari, M; Enayati, MH; Salehi, M; Nahvi, SM; Park, CG
- Date Issued
- 2013-11-25
- Publisher
- Surface and Coatings Technology
- Abstract
- The aim of this research is to investigate the sliding friction and wear behavior of a novel WC-Co thermal spray coating deposited from electroless Ni-P coated WC-12Co feedstock powders. The Ni-P coated powders were sprayed on ST37 steel substrate to form a coating, denoted as Ni-P modified WC-12Co coating, using high velocity oxygen fuel (HVOF) process. The X-ray diffractometry (XRD) and high resolution field emission scanning electron microscopy (HR FESEM) were used to analyze microstructural properties of Ni-P coated WC-12Co powders and the resultant coating. The sliding friction and wear behavior of Ni-P modified coating was investigated using a ball-on-disk technique under an applied load of 30 N. The Ni-P modified WC-12Co coating showed extremely lower decarburization level, higher hardness and fracture toughness as compared to the conventional WC-12Co and WC-17Co coatings. The wear rate of Ni-P modified coating was found to be similar to 32 x 10(-4) mg/m indicating similar to 68 and 72% improvement in wear resistance, with respect to the conventional WC-12Co and WC-17Co coatings. Moreover, the Ni-P modified coating exhibited the lowest average friction coefficient of similar to 0.4 with minor fluctuations. The dominating wear mechanism of Ni-P modified coating was individual WC particles pull-out following extrusion of Ni (Co) binder phase. (C) 2013 Elsevier B.V. All rights reserved.
- Keywords
- WC-Co; HVOF; Friction; Wear behavior; ABRASIVE WEAR BEHAVIOR; HIGH-VELOCITY OXYFUEL; CARBIDE GRAIN-SIZE; CERMET COATINGS; MECHANICAL-PROPERTIES; WC-12CO COATINGS; DECARBURIZATION; NANOCOMPOSITE; HARDNESS; MICROSTRUCTURES
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/14981
- DOI
- 10.1016/J.SURFCOAT.2013.07.059
- ISSN
- 0257-8972
- Article Type
- Article
- Citation
- Surface and Coatings Technology, vol. 235, page. 310 - 317, 2013-11-25
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- There are no files associated with this item.
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