Microstructure-property relations in WC-Co coatings sprayed from combinatorial Ni-plated and nanostructured powders
SCIE
SCOPUS
- Title
- Microstructure-property relations in WC-Co coatings sprayed from combinatorial Ni-plated and nanostructured powders
- Authors
- Han, J.-C.; Jafari, M.; Park, C.-G.; SEOL, JAE BOK
- Date Issued
- 2017-07
- Publisher
- ELSEVIER SCIENCE INC
- Abstract
- In this study, we addressed the effects of Ni-plating and nanostructuring of WC-Co powders on the microstructure-property relations and WC decarburization of WC-Co composite coatings. By high velocity oxygen fuel (HVOF) spraying, the coating materials were produced from four different powders, referred to as microstructured WC-Co (mc-WC), nanostructured WC-Co (nc-WC), Ni-plated microstructured WC-Co (Ni/mc-WC) and Ni-plated nanostructured WC-Co (Ni/nc-WC). We found that the coatings, deposited from Ni-free powders, undergo a high level of decarburization, thereby yielding W2C phase formation in brittle amorphous W-rich Co matrix that could be preferential site for crack propagation. On the contrary, the Ni-plating treatment could reduce the amount of decarburization of the coatings, resulting in the uniform distribution of WC phase in the W-depleted Co matrix. Consequently, we revealed the underlying mechanisms responsible for WC decarburization in the coatings, and further suggested that the coating deposited from Ni-plated and nanostructured powders exhibits a superior combination of hardness and fracture toughness as compared to other coatings. ? 2017
- Keywords
- Composite coatings; Decarburization; Fracture toughness; HVOF thermal spraying; Mechanical properties; Microstructure; Nanostructured materials; Nickel; Nickel plating; Powders; Sprayed coatings; Tungsten alloys; Coating material; High Velocity OxygenFuel (HVOF) spraying; Microstructure-property relation; Nano-structuring; Nanostructured powders; Phase formations; Uniform distribution; WC-Co coating; Tungsten carbide
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/92071
- DOI
- 10.1016/j.matchar.2017.05.005
- ISSN
- 1044-5803
- Article Type
- Article
- Citation
- MATERIALS CHARACTERIZATION, vol. 129, page. 207 - 216, 2017-07
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