High temperature oxidation behavior of micro/nanostructured WC-Co coatings deposited from Ni-coated powders using high velocity oxygen fuel spraying
SCIE
SCOPUS
- Title
- High temperature oxidation behavior of micro/nanostructured WC-Co coatings deposited from Ni-coated powders using high velocity oxygen fuel spraying
- Authors
- Jafari, M; Enayati, MH; Salehi, M; Nahvi, SM; Han, JC; Park, CG
- Date Issued
- 2016-09-25
- Publisher
- ELSEVIER
- Abstract
- High temperature oxidation of WC-based cermet coatings deposited from electroless Ni-coated micro- and nano-structured WC-Co powders (Ni/mc-WC and Ni/nc-WC) was studied. High velocity oxygen fuel (HVOF) spraying was employed for coating deposition, and thermo-gravimetry analysis (TGA) was carried out to examine the oxidation kinetics at 600-800 degrees C. For comparison, the same experiments were performed on conventional micro/nanostructured WC-Co coatings (mc-WC and nc-WC). Oxidation resistance of Ni/mc-WC and Ni/nc-WC coatings at 800 degrees C was improved by 88.5% and 893% compared to me-WC and nc-WC coatings, respectively. Linear kinetics with activation energies of 90.4 and 78.9 kJ/mol were obtained for me-WC and nc-WC, respectively, while oxidation kinetics of Ni/mc-WC and Ni/nc-WC coatings obeyed the parabolic law with greater activation energies of 212 and 197.5 kymol. (C) 2016 Elsevier B.V. All rights reserved.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/37640
- DOI
- 10.1016/J.SURFCOAT.2016.06.044
- ISSN
- 0257-8972
- Article Type
- Article
- Citation
- Surface and Coatings Technology, vol. 302, page. 426 - 437, 2016-09-25
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