Microstructural evaluation of suspension thermally sprayed WC-Co nanocomposite coatings.
Ahmed, Rehan; Faisa, Nadimul Haque; Ali, O.; Al-Anazi, Nayef M.; Al-Mutairi, S.; Mamour, S.; Polychroniadis, E.K.; Goosen, Mattheus F.A.
Nadimul Haque Faisa
Nayef M. Al-Anazi
Mattheus F.A. Goosen
Ahmet Yavuz Oral
Microstructural and sliding wear evaluations of nanostructured coatings deposited by Suspension High Velocity Oxy-Fuel (S-HVOF) spraying were conducted in as-sprayed and HIPed (Hot Isostatically Pressed) conditions. S-HVOF coatings were nanostructured via ball milling of the WC-12Co start powder, and deposited via an aqueous based suspension using modified HVOF (TopGun) spraying. Microstructural evaluations of these hardmetal coatings included TEM (Transmission Electron Microscopy), X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). Sliding wear tests were conducted using a ball-on-flat test rig. Results indicated that nanostructured features inherited from the start powder in S-HVOF spraying were retained in the resulting coatings. The decarburisation of WC due to a higher surface area to volume ratio was also observed in the S-HVOF coatings. Nanostructured and amorphous phases caused by the high cooling rates during thermal spraying crystallized into complex eta-phases after the HIPing treatment. Sliding wear performance indicated that the coating wear was lower for the HIPed coatings.
|Start Date||Oct 16, 2014|
|Publication Date||May 5, 2015|
|Publisher||Springer (part of Springer Nature)|
|Series Title||Springer proceedings in physics|
|Institution Citation||AHMED, R., FAISAL, N.H., ALI, O., AL-ANAZI, N.M., AL-MUTAIRI, S., MAMOUR, S., POLYCHRONIADIS, E.K. and GOOSEN, M.F.A. 2015. Microstructural evaluation of suspension thermally sprayed WC-Co nanocomposite coatings. In Polychroniadis, E.K., Oral, A.Y. and Ozer, M. (eds.) Proceedings of the 2nd International multidisciplinary microscopy and microanalysis congress 2014 (InterM), 16-19 October 2014, Oludeniz, Turkey. Springer proceedings in physics, 164. Cham: Springer [online], pages 31-38. Available from: https://doi.org/10.1007/978-3-319-16919-4_5|
|Keywords||Nanostructured coating; WCCo coating; Suspension spraying; Wear; Tribology|
AHMED 2015 Microstructural evaluation of suspension thermally