Influence of codeposited Al2O3 and h/BN on tribological properties of Ni-Al2O3-h/BN composite coatings
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Ni-Al2O3-h/BN composite coatings were prepared by dispersing different contents of Al2O3 nanoparticles and h/BN nanosheetsin the plating bath. The prepared composite coatings were then characterized for surface morphology, surface roughness,elemental composition, Vickers microhardness, X-ray diffraction, and wear and coefficient of friction test by using moderninstruments. Compared to the nickel coating, composite coatings have revealed an increase in Vickers microhardness,improved surface roughness, and tribological properties. Increasing the h/BN content into the deposit improved the coefficientof friction, whereas increase in Al2O3 content improved wear rate. Among the different samples, the composite coatingprepared by dispersing 10 g/L of each Al2O3 nanoparticles and h/BN nanosheets improved both wear and coefficient of frictionunder dry condition. In addition, the coefficient of friction was also investigated under different loadings during the wear test. The result showed that the lowest coefficient of friction was observed at 5 N load.
Abstract
Ni-Al2O3-h/BN composite coatings were prepared by dispersing different contents of Al2O3 nanoparticles and h/BN nanosheetsin the plating bath. The prepared composite coatings were then characterized for surface morphology, surface roughness,elemental composition, Vickers microhardness, X-ray diffraction, and wear and coefficient of friction test by using moderninstruments. Compared to the nickel coating, composite coatings have revealed an increase in Vickers microhardness,improved surface roughness, and tribological properties. Increasing the h/BN content into the deposit improved the coefficientof friction, whereas increase in Al2O3 content improved wear rate. Among the different samples, the composite coatingprepared by dispersing 10 g/L of each Al2O3 nanoparticles and h/BN nanosheets improved both wear and coefficient of frictionunder dry condition. In addition, the coefficient of friction was also investigated under different loadings during the wear test. The result showed that the lowest coefficient of friction was observed at 5 N load.
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