Effect of nano yttria-stabilized zirconia on properties of Ni-20Cr composite coatings

Abstract

In the present work, 5 wt.% and 10 wt.% yttria-stabilized zirconia (YSZ) nanoparticles were reinforced in Ni-20Cr powder and deposited on boiler tube steel using a high-velocity oxy-fuel spraying process. The effect of YSZ reinforcement on microhardness, surface roughness and porosity was investigated. The hardness was the highest for nanocomposite coating reinforced with 10 wt.% YSZ and hardness was found to increase with a decrease in porosity. The coating microstructure and elements were characterized using field emission scanning electron microscopy (FE-SEM) with an energy dispersive spectroscope (EDS). The constituents of the coating were identified using X-ray diffractometer. It was found that the composite coating with 10 wt.% YSZ reinforced nanocomposite coating has the highest microhardness, in the range of 1008-1055 hv. During the coating process, nano YSZ particles were dispersed in the gaps between the micrometric Ni-20Cr particles, providing a better coating matrix than conventional Ni-20Cr. The Ni-20Cr with 10 wt.% of YSZ nanoparticles showed better results in terms of mechanical and microstructural properties during the investigation.

Corrosion cracking in Mg alloys based bioimplants

“…Various coating methods are employed to protect the surface of different biomedical materials [94][95][96][97]. Spray pyrolisis deposition [98], Electroplating [99], electrodeposition [100], hot dipping [98][99][100][101][102][103][104], physical vapor deposition (PVD) & chemical vapor deposition (CVD) [105][106][107][108][109][110][111][112][113][114][115][116][117], electrochemical vapor deposition (EVD) [118], cold spray [119], thermal spraying [120][121][122][123][124][125], sputtering [126], claddings [64][65][66][67][68][69][70][71][72][73][74]…”

High temperature corrosion behaviour of ZrO2 reinforced Cr2O3 composite coatings in molten salt environment

“…Among the techniques, thermal spray techniques have shown the successful results in depositing uniform and dense protective layer (Mahesh and Prakash, 2008). Thermal spray coating processes, which are widely used in the manufacture of thermal barrier coating systems, are a flexible and relatively simple method of producing coatings that have the potential to provide long-term economic life and high efficiency by significantly improving the physical, mechanical and usability properties of the components to which they are applied (Zou et al , 2016; Muthu et al , 2019; Parkash and Sidhu, 2003; Singh et al , 2017; Patarini et al , 1979; Puri et al , 2004; Singh et al , 2022).…”

Latest developments in the protection of steels from corrosion and erosion

“…Abradable coatings are essentially sealing materials and are deposited by thermal spray techniques [7]. In the research work [8], 5 and 10 wt.% yttria-stabilized zirconia (YSZ) nanoparticles were reinforced in Ni-20Cr powder and deposited on boiler tube steel using a high-velocity oxy-fuel spraying process. Colmonoy-6+WC powders were deposited with the help of the laser cladding method on the bare SS304 and SS410 steel surfaces by the authors [9].…”