Microstructure, friction, and wear properties of Ni‐Al₂O₃‐MoS₂ composite coatings

Abstract

Ni‐Al2O3‐MoS2 composite coatings were prepared on the surface of aluminum alloy substrates by an integrative method of electrophoresis and electrodeposition from the electrolytic solution with different MoS2 concentrations. The surface morphology and compositions of the coatings were studied by scanning electron microscopy equipped with an energy dispersive spectroscope. The microindentation hardness and tribological properties of the coatings were tested using a Vickers hardness tester and friction performance tester in dry sliding condition, respectively. Results showed that the cross‐sections of the coatings exhibited smooth morphology and uniform distribution of the compositions. Al2O3 and MoS2 particles were uniformly dispersed in the Ni matrix. The coatings were sufficiently adhered on the aluminum alloy substrates. The addition of MoS2 particles can significantly improve the wear resistance of the coatings. When the MoS2 concentration is 1.0 g/L, the Ni‐Al2O3‐MoS2 coatings exhibit superior mechanical properties.

Deposition characteristics, microstructure and wear behaviour of Co–WC composite coatings

“…High incorporation (18.78 wt-%) and uniform distribution of WC particles as well as the smooth and compact morphology of the as-prepared coatings are the primary factors responsible for the wear resistance of the composite coating. The second-phase particles homogeneously dispersed in the coating perform a supporting and bearing role between the friction pairs [31]. Furthermore, some WC particles were separated from the cobalt matrix during the friction and wear test, which changed the friction mode between the friction pairs from sliding to rolling.…”

Tribological Behavior of Co-WC Composite Coatings

“…As the WC concentration increases to 35g/L, the phenomenon of low friction coefficient and wear loss could be attributed to the high WC load and compact microstructure of the Co-WC composite coatings. In addition, WC particles uniformly embedded in the Co matrix perform a supporting and bearing role between the friction pairs [15], which avoids the direct contact between the friction surfaces, thereby improving the wear resistance of the Co-WC composite coating. However, if this concentration exceeds the optimal value, many WC particles agglomerate and then incorporate into the cobalt matrix, and these WC agglomerates weaken the bond strength between grains of Co matrix, resulting in a relatively poor wear behavior.…”

Enhanced interfacial and tribological properties of fabric liner by constructing a MXene/HNTs/PAMAM hierarchical coating

“…The introduction of nanoparticles through PAMAM, polyhedral oligomeric silsesquioxane (POSS) and so on, to design "flexible-rigid" multiscale enhancement structures, achieved synergetic enhancement effect in tribological properties. [21][22][23] It was reported that hyperbranched polyglycerol (HPG) was grafted on carbon fiber surface through anionic ring-opening polymerization to enhance interfacial adhesion. The interfacial and interlaminar shear strength of fiber/epoxy composites modified with HPG enhanced by 90.69% and 49.83%, respectively.…”

“…At present, dendritic polymers were employed to design and construct the interphase for polishing up interfacial compatibility of composites, which had aroused widespread interests. The introduction of nanoparticles through PAMAM, polyhedral oligomeric silsesquioxane (POSS) and so on, to design “flexible‐rigid” multiscale enhancement structures, achieved synergetic enhancement effect in tribological properties 21–23 . It was reported that hyperbranched polyglycerol (HPG) was grafted on carbon fiber surface through anionic ring‐opening polymerization to enhance interfacial adhesion.…”