scholarly journals Surface Energy and Tribology of Electrodeposited Ni and Ni–Graphene Coatings on Steel

Lubricants ◽  
2019 ◽  
Vol 7 (10) ◽  
pp. 87 ◽  
Author(s):  
Arpith Siddaiah ◽  
Pankaj Kumar ◽  
Artie Henderson ◽  
Manoranjan Misra ◽  
Pradeep L. Menezes
Keyword(s):  
Surface Energy ◽  
Tribological Properties ◽  
Wear Behavior ◽  
Polar Component ◽  
Dispersive Component ◽  
Mechanical And Tribological Properties ◽  
Low Surface Energy ◽  
Electrochemical Coatings ◽  
Solid Liquid Interface ◽  
Solid Liquid

Composite electrochemical coatings (CECs) are some of the most widely investigated coatings due to its versatility in tailoring physio-mechanical and tribological properties. The effectiveness of the CECs for tribological applications is dependent on the solid–liquid interfaces. The active and passive nature of the contact boundaries for a CEC with a solid/liquid interface is defined by the surface energy of these boundaries. Unless the effect of surface energy on the tribological properties of the CEC are understood, it is not possible to get a holistic picture on properties, such as corrosion and tribocorrosion. The present study investigates the surface energy of optimized nickel (Ni) and Ni–graphene (Ni–Gr) coatings and their effect on the dynamic friction and wear behavior. It was found that the addition of Gr to the Ni coating in small quantities could decrease the polar component of surface energy significantly than the dispersive component. The presence of Gr in the coating was able to reduce the wear while providing low friction. The Ni–Gr coating exhibited low surface energy that includes weak adhesive forces, which can prevent embedding of the wear particles during sliding.

Wear Behavior of Mg Alloy Procduced by Equal Channel Angular Extrusion

2013 ◽  
Vol 734-737 ◽  
pp. 2369-2372
Author(s):  
Lei Lei Gao ◽  
Jin Zhong Zhang
Keyword(s):  
Wear Resistance ◽  
Friction Coefficient ◽  
Tribological Properties ◽  
Equal Channel Angular Extrusion ◽  
Wear Behavior ◽  
Experimental Results ◽  
Mg Alloy ◽  
Mechanical And Tribological Properties ◽  
Angular Extrusion

A commercial Mg alloy was prepared through equal channel angular extrusion (ECAE) process. The effect of ECAE on mechanical and tribological properties of the alloy was investigated. Experimental results showed that the hardness and strength of the alloy with ECAE were higher than that of the alloy without ECAE and increased with the increase pass number. The friction coefficient and wear resistance of the alloy after ECAE were significantly improved.

Tribological Properties of WC-12Co Coating on AZ91 Magnesium Alloy Fabricated by High Velocity Oxy-Fuel Spray

2014 ◽  
Vol 33 (1) ◽  
pp. 41-48 ◽  
Author(s):  
F. Yıldız
Keyword(s):  
Magnesium Alloy ◽  
Tribological Properties ◽  
High Velocity ◽  
Wear Behavior ◽  
Fuel Spray ◽  
Az91 Magnesium Alloy ◽  
Mechanical And Tribological Properties ◽  
Hardness Tester ◽  
Pin On Disc ◽  
Az91 Magnesium

AbstractIn this study, conventional WC-12Co cermet coatings were deposited on AZ91 magnesium alloy using High Velocity Oxy-Fuel spray method. The effects of different coating thicknesses (60 and 120 µm) and wear loads (20 and 30 N) on tribological properties of AZ91 magnesium alloy coated with WC-12Co were investigated. Structural, mechanical and tribological properties of WC-12Co coatings were analyzed by means of X-ray diffractometer, scanning electron microscope, micro-hardness tester and pin-on-disc tribotester. It was observed that WC-12Co coating is an effective method for improving the wear behavior of AZ91 magnesium alloy.

TEMPERATURE-DEPENDENT EFFECT OF BORIC ACID ADDITIVE ON SURFACE ROUGHNESS AND WEAR RATE

2017 ◽  
Vol 24 (Supp01) ◽  
pp. 1850005
Author(s):  
ŞERAFETTIN EKİNCİ
Keyword(s):  
Surface Roughness ◽  
Friction Coefficient ◽  
Wear Rate ◽  
Boric Acid ◽  
Tribological Properties ◽  
Internal Combustion Engines ◽  
Wear Behavior ◽  
Important Place ◽  
Mechanical And Tribological Properties ◽  
Wear And Friction

Wear and friction hold an important place in engineering. Currently, scientific societies are struggling to control wear by means of studies on lubricants. Boric acid constitutes an important alternative with its good tribological properties similar to MO2S and graphite alongside with low environmental impacts. Boric acid can be used as a solid lubricant itself whereas it can be added or blended into mineral oils in order to yield better mechanical and tribological properties such as low shear stress due to the lamellar structure and low friction, wear and surface roughness rates. In this study, distinguishing from the literature, boric acid addition effect considering the temperature was investigated for the conventional ranges of internal combustion engines. Surface roughness, wear and friction coefficient values were used in order to determine tribological properties of boric acid as an environmentally friendly additive and mineral oil mixture in the present study. Wear experiments were conducted with a ball on disc experimental setup immersed in an oil reservoir at room temperature, 50[Formula: see text]C and 80[Formula: see text]C. The evolution of both the friction coefficient and wear behavior was determined under 10[Formula: see text]N load, at 2[Formula: see text]m/s sliding velocity and a total sliding distance of 9000[Formula: see text]m. Surface roughness was determined using atomic-force microscopy (AFM). Wear rate was calculated utilizing scanning electron microscope (SEM) visuals and data. The test results showed that wear resistance increased as the temperature increased, and friction coefficient decreased due to the presence of boric acid additive.

scholarly journals Universal and tunable liquid–liquid separation by nanoparticle-embedded gating membranes based on a self-defined interfacial parameter

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Xiangyu Li ◽  
Jingjing Liu ◽  
Ruixiang Qu ◽  
Weifeng Zhang ◽  
Yanan Liu ◽  
...  
Keyword(s):  
Surface Energy ◽  
High Performance ◽  
Separation Efficiency ◽  
Liquid Mixtures ◽  
Immiscible Liquid ◽  
Organic Liquids ◽  
In Situ Extraction ◽  
Low Surface Energy ◽  
Liquid Repellency ◽  
Solid Liquid

AbstractSuperwetting porous membranes with tunable liquid repellency are highly desirable in broad domains including scientific research, chemical industry, and environmental protection. Such membranes should allow for controllable droplet bouncing or spreading, which is difficult to achieve for low surface energy organic liquids (OLs). Here we develop an interfacial physical parameter to regulate the OL wettability of nanoparticle-embedded membranes by structuring synergistic layers with reconfigurable surface energy components. Under the tunable solid-liquid interaction in the aggregation-induced process, the membranes demonstrate positive/negative liquid gating regularity for polar protic liquids, polar aprotic liquids, and nonpolar liquids. Such a membrane can be employed as self-adaptive gating for various immiscible liquid mixtures with superior separation efficiency and permeation flux, even afford successive achievement of high-performance in situ extraction-back extraction coupling. This study should provide distinctive insights into intrinsic wetting behaviors and have pioneered a rational strategy to design high-performance separation materials for diverse applications.

Drying Mechanics of Gels

1986 ◽  
Vol 73 ◽  
Author(s):  
George W. Scherer
Keyword(s):  
Surface Energy ◽  
Viscous Flow ◽  
Specific Energy ◽  
Interfacial Energy ◽  
Driving Force ◽  
Contraction Rate ◽  
Vapor Interface ◽  
Energy Dissipated ◽  
Solid Liquid Interface ◽  
Solid Liquid

ABSTRACTA model is presented for the stresses and strains that develop in a gel during drying. The driving force for shrinkage is assumed to be the interfacial energy, and the gel is considered to be viscoelastic. The liquid seeks to flow into the dry region of a gel in order to replace the solid-vapor interface with a solid-liquid interface having lower specific energy. This creates a “redistribution pressure” that causes the wet region to contract. The free contraction rate can be calculated by equating the decrease in surface energy with the energy dissipated in viscous flow as the gel contracts. The permeability of the gel to the liquid in the pores is especially important in the early stages of drying, and may control the contraction rate. The model allows quantitative predictions of contraction rate and stress during drying. In this paper, the model is applied to a plate drying from both sides.

EFFECT OF SURFACE PROPERTIES ON THE WETTABILITY OF IRON CONTAINING AMORPHOUS CARBON FILMS

2002 ◽  
Vol 16 (06n07) ◽  
pp. 1031-1037 ◽  
Author(s):  
J. S. CHEN ◽  
S. P. LAU ◽  
Z. SUN ◽  
G. Y. CHEN ◽  
Y. J. LI ◽  
...  
Keyword(s):  
Contact Angle ◽  
Surface Energy ◽  
Amorphous Carbon ◽  
Photoelectron Spectroscopy ◽  
Contact Angle Measurement ◽  
Carbon Films ◽  
Angle Measurement ◽  
Vacuum Arc ◽  
Polar Component ◽  
Dispersive Component

Ta-C and iron containing amorphous carbon (a-C:Fe) films were deposited by filtered cathodic vacuum arc technique. The influences of Fe contents on the wettability of the films were investigated in terms of surface energy. The surface energy of a-C:Fe films was determined by the contact angle measurement. Atomic force microscopy (AFM), Raman spectroscopy and X-ray induced photoelectron spectroscopy (XPS) were employed to analyze the origin of the variation of surface energy with various Fe content. It is found that the contact angle for water increases significantly after incorporating Fe into the films and the films become hydrophobic. The roughness of these films has a little effect on the contact angle. The surface energy is reduced after incorporating Fe into the a-C film which is due to the reduction of both dispersive and polar component. The reduction in dispersive component is ascribed to the decrease of atomic density of the a-C:Fe films due to the increase in sp2 bonded carbon. The absorption of oxygen on the surface play an important role in the reduction of polar component for the a-C:Fe films. It is proposed that such network as (Ca-O-Fe)-O-(Fe-O-Ca) may be formed and responsible for the reduction of polar component.

Microstructure, Mechanical and Tribological Properties of the Tialn Coatings after Nb and C Dual Ion Implantation

2014 ◽  
Vol 789 ◽  
pp. 455-460 ◽  
Author(s):  
Bin Deng ◽  
Jun Fei Pei ◽  
Ye Tao
Keyword(s):  
Ion Implantation ◽  
Tribological Properties ◽  
Photoelectron Spectroscopy ◽  
Wear Behavior ◽  
Ion Source ◽  
Nanoindentation Test ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mechanical And Tribological Properties ◽  
Magnetic Filter

Ion implantation is an effective method to enhance hardness and wear resistance of the TiAlN coatings. In this paper, Nb and C ions are co-implanted into TiAlN coatings deposited by Magnetic Filter Arc Ion Plating (MFAIP), using a Metal Vacuum Vapor Arc (MEVVA) ion source implantor with doses of 1×1017and 5×1017ions/cm2. The microstructure, chemical composition, mechanical and tribological properties of Nb+C-implanted TiAlN coatings have been investigated by glancing incidence X-ray diffraction, X-ray photoelectron spectroscopy, nanoindentation test and SRV friction & wear tester, respectively. The results showed that the NbN and TiC phases could be detected both from the XRD and XPS profiles of as-prepared films. Nb and C ion implantation could improve the hardness, plastic deformation resistance and wear behavior of TiAlN coatings due to the energetic Nb and C ion bombardment and the formation of NbN and TiC phases.

Effect of tungsten carbide on mechanical and tribological properties of jute/sisal/E-glass fabrics reinforced natural rubber/epoxy composites

2017 ◽  
Vol 48 (4) ◽  
pp. 713-737 ◽  
Author(s):  
D Athith ◽  
MR Sanjay ◽  
TG Yashas Gowda ◽  
P Madhu ◽  
GR Arpitha ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Natural Rubber ◽  
Tungsten Carbide ◽  
Tribological Properties ◽  
Natural Fiber ◽  
Hybrid Composites ◽  
Wear Behavior ◽  
Natural Fibers ◽  
Mechanical And Tribological Properties ◽  
Wear Analysis

Natural fiber polymer composites have been largely used in applications like aerospace, automotive, marine, and other civil structures, where mechanical and tribological properties are of prime consideration. The performance of hybrid composites can be improved by using different natural fibers and adding particulate fillers to them. In this study, mechanical and tribological properties of jute/sisal/E-glass fabrics reinforcing matrix such as natural rubber and epoxy filled with different proportion of tungsten carbide (WC) powder were studied. Mechanical properties like tensile strength, flexural strength, impact strength, and also tribological behavior like two-body abrasive wear of composite were studied. Taguchi technique was employed for wear analysis. Results revealed that there is a significant change in the mechanical properties and enhancement of wear behavior was noticed due to the incorporation of filler (WC) particles.

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