Microstructure and Hardness Properties of high velocity oxygen fuel (HVOF) Sprayed WCCo-SiC Coatings

Serkan ISLAK, Cihan ÖZORAK, Özkan KÜÇÜK, Mehmet AKKAŞ, Cihangir Tevfik SEZGİN
1.706 1.243


In this study, WCCo-SiC based coatings were produced on the surface of AISI 1050 steel using high velocity oxygen fuel (HVOF) thermal spraying technique. Ni-based powder was used to connect to together WCCo and SiC powders. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize the microstructures of WCCo-SiC based coatings. The surface hardness of substrate and coating were measured using a Vickers hardness tester. The XRD results showed that the WCCo-SiC coatings were mainly composed of WC, W2C, SiC, Cr5B3, γ-Ni and Co phases. It was reported that the microstructure and microhardness of coatings generally changed depending on the amount of SiC and WCCo.

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Buytoz, S., Ulutan, M., Islak, S., Kurt, B. and Çelik, O.N. (2013) Microstructural and Wear Characteristics of High Velocity Oxygen Fuel (HVOF) Sprayed NiCrBSi–SiC Composite Coating on SAE 1030 Steel, Arabian Journal for Science and Engineering, vol 38(6), 1481-1491.

Davis J.R. (2004) Handbook of thermal spray technology, Thermal Spray Society Training Committee, ASM International, Materials Park (OH).

Dongmo, E., Wenzelburger, M. and Gadow, R. (2008) Analysis and optimization of the HVOF process by combined experimental and numerical approaches. Surf. Coat. Technol. vol. 202, 4470–4478.

Herman, H., Sampath, S. and McCune, R. (2000) Thermal spray: current status and future trends. Mat. Res. Soc. Bull. vol. 25(7), 17–25.

Islak, S., Eski, O., Buytoz, S. and Stokes, J. (2012) Microstructure and microhardness characterization of Cr3C2-SiC Coatings Produced Using the Plasma Transferred Arc Method, MP-Materials Testing-Materials and Components Technology and Application, vol. 54 (11-12), 793-799.

Islak, S. and Buytoz, S. (2013) Microstructure properties of HVOF-sprayed NiCrBSi/WCCo-based composite coatings on AISI 1040 steel, Optoelectronics and Advanced Materials – Rapid Communications, Vol. 7(11-12), 900 – 903.

Jafari, M., Enayati, M.H., Salehi, M., Nahvi, S.M. and Park, C.G. (2013) Comparison between oxidation kinetics of HVOF sprayed WC–12Co and WC–10Co–4Cr coatings, Int. J. Refract. Met. Hard. Mater. vol. 41, 78-84.

Lou, B., Chen, Z., Bai, W. and Dong, G. (2006) Structure and erosion resistance of Ni60A/SiC coatting by laser cladding, Transactions of Nonferrous Metals Society of China, vol. 16, 643-646.

Ma, N., Guo, L., Cheng, Z., Wu, H., Ye, F. and Zhang, K. (2014) Improvement on mechanical properties and wear resistance of HVOF sprayed WC-12Co coatings by optimizing feedstock structure, Applied Surface Science, vol. 320, 364-371.

Mann, B.S. and Arya, V. (2003) HVOF coating and surface treatment for enhancing droplet erosion resistance of steam turbine blades. Wear, vol. 254, 652–667.

Mann, B.S., Arya, V. and Joshi, P. (2005) Advanced high-velocity oxygenfuel coating and candidate materials for protecting LP steam turbine blades against droplet erosion. J. Mater. Eng. Perform. vol. 14, 487–494.

Moskowitz, L. and Trelewicz, K. (1997) HVOF coatings for heavy-wear, high-impact applications. J. Therm. Spray Technol. vol. 6, 294–299.

Pawlowski L. (2008) The Science and Engineering of Thermal Spray Coatings. 2nd ed., Wiley, Chichester.

Ramesh, M.R., Prakash, S., Nath, S.K., Sapra, P. K., Venkataraman, B. (2010) Solid particle erosion of HVOF sprayed WC-Co/NiCrFeSiB coatings, Wear, vol. 269(3-4), 197-205.

Rastegar, F. and Richardson, D.E. (1997) Alternative to chrome: HVOF cermet coatings for high horse power Diesel engines. Surf. Coat. Technol. vol. 90, 156–163.

Scrivani, A., Ianelli, S., Rossi, A., Groppetti, R., Casadei, F., Rizzi, G. (2001) A contribution to the surface analysis and characterisation of HVOF coatings for petrochemical application, Wear, vol. 250, 107–113.

Stewart, D.A., Shipway, P.H., McCartney, D.G. (2000) Microstructural evolution in thermally sprayed WC–Co coatings: comparison between nanocomposite and conventional starting powders, Acta Materialia, vol. 48, 1593–1604.

Venter, A.M., Oladijo, O.P., Luzin, V., Cornish, L.A. and Sacks, N. (2013) Performance characterization of metallic substrates coated by HVOF WC–Co, Thin Solid Films, vol. 549, 330-339.

Wood, R.J.K. (2010) Tribology of thermal sprayed WC–Co coatings. Int. J. Refract. Met. Hard. Mater. vol. 28, 82–94.