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Comparison of wear performance of thermal sprayed cermet (WC-Co) coatings from suspension and feedstock powders.

Ali, O.; Ahmed, R.; Alawadhi, H.; Shameer, M.; Faisal, N.H.; Al-Anazi, N.M.; Goosen, M.F.A.

Authors

O. Ali

R. Ahmed

H. Alawadhi

M. Shameer

N.M. Al-Anazi

M.F.A. Goosen



Abstract

WC-Co coatings were deposited using conventional High Velocity Oxy-Fuel Jet-Kote (HVOF-JK) and Suspension HVOF (S-HVOF) methods. Microstructural and mechanical properties along with the wear resistance of coatings were investigated. Reciprocating sliding wear tests were conducted against sintered Si3N4 counter-body with a normal load of 25N and total sliding distance of 500m following ASTM G133-2 standard. Coatings were characterised by Scanning Electron Microscope (SEM), X-Ray Diffraction (XRD) and nano-Indentation techniques. HVOF-JK coating showed good retention of WC whereas S-HVOF coating showed the presence of W, W2C and amorphous/nanocrystalline phases. Nano-indentation of HVOF-JK and S-HVOF showed that the relative hardness of the HVOF-JK coating was higher but their elastic modulus was lower. The lower total wear rate was exhibited by the HVOF-JK coating. This difference in wear performance is attributed to the difference in hardness of the coatings and decarburisation of WC particles.

Start Date Jun 7, 2017
Publication Date Apr 30, 2018
Publisher DVS Media
Pages 681-686
ISBN 9781510858220
Institution Citation ALI, O., AHMED, R., ALAWADHI, H., SHAMEER, M., FAISAL, N., AL-ANAZI, N. and GOOSEN, M. 2017. Comparison of wear performance of thermal sprayed cermet (WC-Co) coatings from suspension and feedstock powders. In Proceedings of the 2017 International thermal spray conference and exposition (ITSC 2017), 7-9 June 2017, Düsseldorf, Germany. Düsseldorf: DVS Media, pages 681-686.
Keywords Nanocomposite; Sliding wear; Suspension spray; Tribology

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