Assessment of Tribological behavior of nickel-nano Si3N4 composite coatings fabricated by pulsed electroplating process

Sajjadnejad M, Karimi Abadeh H, Omidvar H, Hosseinpour S (2020)


Publication Type: Journal article, Original article

Publication year: 2020

Journal

Book Volume: 8

Pages Range: 025009

URI: https://iopscience.iop.org/article/10.1088/2051-672X/ab7ae5

DOI: 10.1088/2051-672X/ab7ae5

Abstract

Pure nickel and nano-composite nickel-silicon nitride (Si3N4) coatings were fabricated using pulsed
current electrodeposition technique.Acontrol sample for each coatingwas created and the effect of
current density, duty cycle, and pulse frequency on the tribological properties of the electrodeposited
coatings was investigated by altering these parameters.X-ray diffraction, scanning electronmicroscopy
and pin-on-disk testswere performed to assess the properties of the fabricated coatings.X-ray diffraction
results indicated that both pure and nano-composite coatings possess preferential growth of (111)
crystallite planes,which results in the formation of binary symmetrical shaped grains.However,
incorporating particles into the coating hindered the growth on other planes, specially (200) growth
plane. Incorporation of Si3N4 particles into the coating reduced crystallite size and increased grain
refinement; both ofwhich resulted in the increased microhardness of the deposited coatings through
dispersion strengtheningmechanism.Complementary atomic forcemicroscopy investigations
indicated that the roughness of all nano-composite sampleswas higher than that for the pure nickel
coating. After incorporation of Si3N4 particles the wear behavior of all coatingswas improved as a result
of the improved hardness.Measured wear rates indicate that increasing the current density, during
electrodeposition, is themost influencing parameter in reducing thewear coefficient. Furthermore,
implementing particles changes thewearmechanismfromhigh plastic deformation, gouging, and
delamination to ploughing. Although nano-composite coatings exhibitwider grooves on the surface
compared to those on pure nickel coatings, they tend to adhere better to the substrate.The friction
coefficient for all nano-composite coatingsweremarginally higher than that for pure nickel coating, to
our understanding, as a result of inadequate load carrying effect of silicon nitride particles.

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How to cite

APA:

Sajjadnejad, M., Karimi Abadeh, H., Omidvar, H., & Hosseinpour, S. (2020). Assessment of Tribological behavior of nickel-nano Si3N4 composite coatings fabricated by pulsed electroplating process. Surface Topography: Metrology and Properties, 8, 025009. https://dx.doi.org/10.1088/2051-672X/ab7ae5

MLA:

Sajjadnejad, Mohammad, et al. "Assessment of Tribological behavior of nickel-nano Si3N4 composite coatings fabricated by pulsed electroplating process." Surface Topography: Metrology and Properties 8 (2020): 025009.

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