TY - GEN
T1 - Microstructural evaluation of suspension thermally sprayed WC-Co nanocomposite coatings
AU - Ahmed, R.
AU - Faisal, N. H.
AU - Ali, O.
AU - Al-Anazi, Nayef M.
AU - Al-Mutairi, S.
AU - Mamour, S.
AU - Polychroniadis, E. K.
AU - Goosen, M. F A
PY - 2015
Y1 - 2015
N2 - 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 highcooling 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.
AB - 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 highcooling 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.
UR - http://www.scopus.com/inward/record.url?scp=84945572352&partnerID=8YFLogxK
U2 - 10.1007/978-3-319-16919-4_5
DO - 10.1007/978-3-319-16919-4_5
M3 - Conference contribution
AN - SCOPUS:84945572352
SN - 9783319169187
VL - 164
T3 - Springer Proceedings in Physics
SP - 31
EP - 38
BT - 2nd International Multidisciplinary Microscopy and Microanalysis Congress
PB - Springer
T2 - 2nd International Multidisciplinary Microscopy and Microanalysis Congress and Exhibition
Y2 - 16 October 2014 through 19 October 2014
ER -