Abstract No.:

 Scheduled at:
Friday, June 09, 2017, Hall 27 11:40 AM
Suspension Spraying III

Comparison of sliding wear performance of thermally sprayed WC-Co coatings

Rehan Ahmed / Heriot-Watt University, Great Britain
Omar Ali* / Heriot-Watt University, Great Britain
Hussain Alawadhi/ University of Sharjah, UAE
Mohamed Shameer/ University of Sharjh, UAE
NadimulHaq Faisal/ Robert Gordon University, UK
Nayef Al-Anazi/ Saudi ARAMCO, Saudi Arabia
Matheus Goosen/ Alfaisal University, Saudi Arabia

Sliding wear resistance of High Velocity Oxy-Fuel (HVOF) coatings was investigated. WC-Co coatings were deposited using conventional Jet Kote (HVOF-JK), JP500 (HVOF-JP) and Suspension HVOF (S-HVOF) methods. Reciprocating sliding wear tests were conducted in accordance with ASTM G133-2 against sintered Si3N4 counter-body, at a normal load of 25N and total sliding distance of 500m. Microstructural and mechanical properties of 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 coatings showed the presence of W, W2C and amorphous/nanocrystalline phases. Nano-indentation results of HVOF-JK and S-HVOF showed that the hardness of HVOF-JK coating was higher, however its relative elasticity was lower. The lowest total wear rate was exhibited by the HVOF-JP coating, followed by HVOF-JK and S-HVOF, respectively. This difference in wear performance is attributed to the difference in hardness of the coatings and decarburisation of WC. Results are discussed in terms of structure property relationships and wear mechanisms.

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