Influence of Reinforcing nano-Al₂O₃ Particles on Microstructure and Hardness Properties of HVOF Sprayed 80Ni20Cr Coatings

Abstract:

80Ni20Cr coatings produced by high-velocity oxygen fuel (HVOF) thermal spray technique are novel and widely used to improve the corrosion and wear resistance of metal and steel components in many applications, especially in coal-fired power plants. The present study investigated the effects of nano-Al₂O₃ at 0.5 wt.% on the microstructure of HVOF-sprayed 80Ni20Cr coating deposited on AISI 304L steels corresponding to its coating hardness. The coating was successfully sprayed with a thickness of 150 – 180 µm. The microstructure and phase formed by the coating were analyzed by a field emission electron microscope (FE-SEM) and an X-ray diffractometer (XRD). Synchrotron X-ray fluorescence spectroscopy (SRXRF) was used to confirm the Cr solid solution in the Ni-based coating. The presence of the nano-Al₂O₃ phase in the 80Ni20Cr coating was characterized by electron backscattered diffraction (EBSD). The nano-Al₂O₃ particles were homogenously distributed in the coating layers. The incorporation of nano-Al₂O₃ into 80Ni20Cr enhanced coating characteristics by decreasing surface roughness by 23% and increasing coating hardness by around 4%.

• Periodical: Materials Science Forum (Volume 1125)
• Pages: 11-17
• DOI: https://doi.org/10.4028/p-h0ZWtE
• Online since: September 2024
• Authors: Suwijak Pokwitidkul, Saowaluk Chaleawlert-Umpon, Penpisuth Thongyoug, Krongthong Kamonsuangkasem, Suttipong Wannapaiboon, Jennarong Tungtrongpairoj*
• Keywords: HVOF Thermal Spray, Nano-Al₂O₃, Nanocomposite, Stainless Steel

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