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.
Doctor Nadimul Faisal N.H.Faisal@rgu.ac.uk
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|
|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|
ALI 2017 Comparison of wear performance