Self-lubricating Ni-P-MoS2 composite coatings

Sun

Int J Applied Ceramic Tech

et al. 2017

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.

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Composition Of the Ni-al 2 O 3 -Mos 2 Composite Coatingsmentioning

confidence: 98%

Section: Composition Of the Ni-al 2 O 3 -Mos 2 Composite Coatingsmentioning

confidence: 99%

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

Sun

Int J Applied Ceramic Tech

et al. 2017

“…Meng et al indicated that the stabilized friction coefficient of the electroless nickel coating decreased with the increasing reciprocating frequency and applied load [24]. He et al deposited a self-lubricating Ni-P-MoS 2 composite coating on a mild steel substrate by electrodeposition, and it showed less wear and oxidation than the pure Ni-P coating [25]. Recently, graphene-based coatings have presented a great prospect of application to improve the friction and wear performance of the mating pair under low and moderate loads, but the friction performance did not reach the expected performance under high loads [26][27][28].Nano-powders of Cu and Sn alloy have been commonly used as lubricating oil additives to improve tribological properties for the advantages of low shear strength and good thermal conductivity.…”

mentioning

confidence: 99%

Wear Behavior of CuSn Coated Piston Ring Sliding against Nodular Cast Iron Cylinder Liner under Heavy-Duty Conditions

et al. 2019

Metals

In order to investigate the friction and wear behavior between the nodular cast iron cylinder liner (Fe) and CuSn coated piston ring under heavy-duty conditions, piston rings with chromium(Cr) coating and CuSn-Cr coating were tested using the piston ring reciprocating liner test rig at the simulated working conditions of 56 MPa, 200 r/min, 190 • C. Compared with the Cr/Fe pair, the CuSn coating consumption of the CuSn-Cr/Fe pair made friction coefficient and cylinder wear loss decrease by 2.8% and 51.5%, respectively. Different size Sn patches worn from the CuSn coated piston ring were embedded into the cylinder liner surface based on the surface topography. This process was shown to reduce the surface roughness of a cylinder liner and form flatter plateau structures. Chemical elements analysis indicated that plateau structures on the cylinder liner surface matched with CuSn-Cr coated ring are helpful to promote the tribo-chemical reaction and generate the reactive products to protect the mutually contacted asperities.Although surface texturing on the cylinder liner or piston ring is an effective method to improve the wear behavior [7-9], various coatings prepared on the piston rings are also important means to improve heavy-duty friction and wear performance [10]. The CrN coating made by the physical vapor deposition or magnetron sputtering method has shown good high temperature resistance to adhesion [11][12][13][14]. In order to improve the thermal stability, oil compatibility, and internal stress of ceramic coatings, nanocomposite coatings (like TiN, TiAlN, TiSiN and TiSiCN) were developed to minimize the frictional losses and wear of piston rings in an automotive engine [15,16]. Shen et al. compared chromium-based ceramic composite (CKS) and nickel-chromium-molybdenum (NCM) coated rings sliding against cast iron liner and demonstrated that the anti-scuffing behavior of NCM is better than that of the CKS with the failure time as a criterion [17]. Wan et al. indicated that the presence of amorphous graphite-like carbon not only combated the scuffing damage and running instability effectively for conventional chromium-based coatings, but also improved the reliability and robustness of the piston rings [18]. Based on the increasing scuffing resistance experiments, diamond-like carbon (DLC) coated piston ring can protect the cast iron liner from scuffing up to 600 N normal load [19]. Its lower friction coefficient and wear loss were attributed to the formation of a mixed tribolayer [19][20][21]. But the existence of residual stress in the preparation process of DLC coating would cause the coating to crack. If stress concentration exerted on the contact interface was too high, it would lead to the coating wear or peeling [22].Compared with hard coatings, soft coatings have also attracted widespread attention for weakening the friction surface damage. Hamilton et al. investigated the relationship between macroscopic wear and the temperature of the MoS 2 coating [23]. Meng et al. indicated that the stabilized fricti...

Progress in Electrochemical and Electrophoretic Deposition of Nickel with Carbonaceous Allotropes: A Review

Awasthi

Pandey

et al. 2019

Adv Materials Inter

Ni has applications in batteries, microchips, aerospace, medical equipment, power generation, and automotive industries but corrosion, erosion, and wear can destruct the surface and make it inept for the applications mentioned above. Carbonaceous reinforcements of carbon nanotubes (CNT), graphene, diamond, diamond‐like carbon, and fullerene have supplemented the performance of Ni coatings. Electrochemical (ED) and electrophoretic deposition (EPD) are widely used techniques to deposit coating. This review encompasses an overview of research progress in the domain of ED and EPD of Ni with carbonaceous reinforcements along with the influencing parameters, mechanism of deposition, description of types, and potential applications of carbonaceous reinforcements. The ample depiction on mechanical, tribological, and electrochemical properties reveals an amended hardness (610 Hv), elastic modulus (240 GPa), wear resistance (wear rate ≈2 × 10−5 mm3 N m−1) and corrosion resistance (Icorr = 0.398 µA cm−2) of Ni‐carbonaceous deposit coatings. Nonetheless, the interconnection of experimental evaluations along with the theoretical studies using first‐principles density functional theory, ab initio, and computational simulations can also deliver a new insight to structural stability, electronic properties, and interfacial mechanism of Ni‐carbonaceous coatings. Thus, this review in detail presents the correlative narration of experimental and theoretical studies of Ni‐carbonaceous depositions that provide multifunctional and prominent research direction on multifunctional coatings.