Tribological Wear Behaviour Research Articles

Tribological wear properties of Yttrium Stabilized Tetragonal Zirconia Coatings on Ti6Al7Nb using Air Plasma Spraying

Ti6Al4V has been extensively used as the most bio-compatible material in the recent decades until it was found about its cytotoxicity due to the presence of vanadium, due to which it is replaced with Niobium which is non-toxic in nature. In this study, 8YSZ coatings with NiCrAlY is used as the Bond Coat (BC) is deposited on the Ti6Al7Nb using air plasma spraying. The surface morphology, elemental composition, phase structure and micro hardness were investigated using FESEM, EDS, XRD respectively. Taguchi methodology is used to study the tribological wear behavior. L16 Orthogonal array is chosen with the process parameters such as distance, velocity, load and coating thickness. Pin-on-disc equipment is used to study the wear analysis. Hardness of the increased from uncoated to the coated whereas there is no significant change in the hardness among the coated specimens. From the experiment conducted, it is concluded that load and coating thickness are the most influential factors in assessing the coefficient of friction and distance, coating thickness are influential factors in assessing weight loss.

Tribological performance of Yttrium stabilized zirconia coatings on Ti6Al7Nb alloy in Hanks Balanced Salt

Titanium alloy (Ti-6Al-7Nb) is the new trend among the bio-compatible alloys due to its non-cytotoxicity. In this work.Ti-6Al-7Nb is coated with 8YSZ powder coating using plasma spraying with NiCrAlY as the bond coat. The surface morphology, elemental composition, phase structure and micro hardness were investigated using FESEM, SEM, EDS, XRD respectively. To study the tribological wear behavior Taguchi methodology is employed. Pin-on-disc equipment is used conduct the experiment in Hanks' Balanced Salt Solution (HBSS) used as the lubricant in accord with ASTM G99 at room temperature. L16 Orthogonal array is chosen with the process parameters such as distance travelled (500, 1000, 1500 and 2000 m), velocity (0.3, 0.6, 0.9 and 1.2 m/sec), load (5, 10, 15 and 20 N) and coating thickness (100, 200, 300 and 400 µm). It is to be noted that there is no significant change in the hardness among the coated specimens but hardness increased from uncoated to the coated specimens. From the experiment it is concluded that distance is the most influential factor in assessing the coefficient of friction and coating thickness is the most influential factor influencing factor in assessing the weight loss.

Fracture Toughness and Tribological Wear Behaviour of Micro Alloyed Pearlitic- Ferritic Ductile Cast Iron

Fracture Toughness and Tribological Wear Behaviour of Micro Alloyed Pearlitic- Ferritic Ductile Cast Iron

Mechanical and Tribological Wear Behavior of Epoxy Hybrid Composites

Mechanical and Tribological behavior of epoxy resin matrix composite reinforced with Molybdenum disulphide (MoS2), Boron Carbide (B4C), and Fly ash (FA) particles was prepared by using hand layup method. The mechanical properties such as compression strength, hardness, Impact strength and tensile strengths were found out as per ASTM standards. Tribological properties of composite were found out using pin on disc wear ester and the results were compared analyzed by Taguchi design of experiment. When the percentage of B4C and FA is increased, the density, hardness, compression strength is found to be increased and the tensile strength gets reduced. The result also reveals that the addition of 10% MoS2 with 5% B4C and 15% FA reduces the wear rate.

Utilization of Fly Ash Cenosphere as Reinforcement for Abrasive Wear Behaviour of LM6 Al Alloy Metal Matrix Composites

In this paper, an attempt has been made for the use of waste fly ash cenosphere for tribological wear behaviour. LM6/cenosphere composites were fabricated by stir casting method. An experimental study has been conducted on pin-on-disc wear testing machine to determine the abrasive wear behaviour of cenosphere particulate-reinforced metal matrix composite. Studies were done by varying the load (5, 10, 15, and 20 N) on 5%, and 7.5, 10, and 12.5% weight percentages of reinforcement at a velocity of 1.0472 m/s. The results revealed that the wear resistance of the 10 wt% reinforced composites is superior to that of other reinforced and unreinforced composites. The worn surface morphology of the eroded surfaces wear was examined using scanning electron microscopy (SEM). The SEM analysis reveals the presence of both abrasive wear and delamination wear mechanism.

Tribological Wear Behaviour of Electrical Contacts Made from AgNi10 Composite

AbstractThe effect of tribological wear of contacts made from an AgNi10 alloy on microstructure and electrical properties was investigated. The contacts were tested in duty cycles loaded with alternating current of 10A intensity. With this value of the current, intensive arcing of contacts occurred. The contacts were tested in the range of 125 to 500 thousand cycles. The contacting surfaces were reported to suffer a high degree of wear, but electrical resistance of the contact system remained stable.

On surface modification of austenitic stainless steel using microwave processed Ni/Cr3C2 composite cladding

ABSTRACTIn the present work Ni-based + 20% Cr3C2 composite clads were developed on SS-304 austenitic stainless steel through microwave hybrid heating technique. Experimental trials were conducted inside a domestic microwave applicator at 2.45 GHz and 900 W. The developed microwave composite clads were characterised through SEM/EDS, XRD and Vicker’s micro-hardness tests. Further tribological wear behavior of the so developed clad was investigated using pin-on-disc type tribometer under dry sliding wear conditions. Microstructural analysis revealed the uniform dispersion of Cr3C2 particles inside the Ni matrix in the form of cellular-like structure. The presence of FeNi3, NiSi, Cr3Ni2 and chromium carbide (Cr3C2) was confirmed from the XRD analysis, which contributes to the increase in micro-hardness of the composite clad. The average value of micro-hardness of the developed clads was found to be 450 ± 55 HV. The microwave-processed clad exhibits three times more wear resistance than SS-304 substrate.

A Review on Tribological Wear behaviour of Reinforced Glass Fiber, Carbon Fiber and MoS2 on PTFE

A Review on Tribological Wear behaviour of Reinforced Glass Fiber, Carbon Fiber and MoS2 on PTFE

Influence of Mn Content on Tribological Wear Behaviour of ZA-27 Alloy

The impact of Mn content on tribological wear behaviour of ZA-27 alloy which is used in an Industrial engineering and tribological applications has been studied. Wear test were conducted under the operational conditions of varying in Nr. pressures and sliding speeds using pin-on-disc wear testing machine. To peruse the wear mechanisms of worn out surface of samples were investigate by SEM images. Result shows 1.5 m/s sliding speed and 0.2498 MPa is observed as critical sliding speed and critical Nr. pressure. Also, minimum vol. wear rate and frictional force for 0.5% Mn content ZA-27 alloy. Laminative wear mechanism for 0.2% Mn, three body wear mechanism for 0.5% Mn and abrasive wear mechanism for 1% Mn is observed.

Role of Nanofillers on Mechanical and Dry sliding Wear Behavior of Basalt- Epoxy Nanocomposites

Basalt fiber reinforced polymer composites are nowadays creating attention in both industrial and academic world. New developments are still under way to explore the application of these composites by tailoring their properties. The objectives of this research article is to evaluate the effect of the incorporation of Nano titanium dioxide (TiO2) alone and in combination with nano clay on the mechanical and tribological wear behaviour of Basalt fabric– Epoxy (BE) composites. A vacuum-assisted resin infusion technique (VARI) was employed to obtain a series of BE composites. The mechanical properties, including tensile strength, tensile modulus, elongation at break, and surface hardness, were investigated in accordance with ASTM standards. From the experimental investigation, it was found that the tensile strength and dimensional stability of the B–E composite increased with increasing fillers. The effect of different loads (10 to 30 N) and sliding distances from 2000 to 8000 m on the performance of the wear resistance of the composites were measured. Slight increase in coefficient of friction for nano Clay-BE composite, reduction of coefficient of friction was noticed for the nano TiO2 and TiO2/Clay filler filled composites. The wear loss of the composites decreased with addition of fillers and increased with increasing sliding distance. Failure mechanisms of the worn surfaces of the filled and unfilled composites were examined with SEM.

Tribological investigations on virgin and accelerated aged PE-UHMW

The aim of this study is to gain a better understanding regarding the tribological wear behaviour of ultra-high molecular weight polyethylene (PE-UHMW) under certain life cycles. In order to make this quantification, virgin and accelerated aged samples were prepared and tested with a uni-directional sliding method, where the wear behaviour was observed under progressive conditions. The aging method was conducted in accordance with ASTM F2003-00. During the tribological tests, the friction coefficient was observed to have a value more than double for the aged specimens compared to the virgin ones. Although in terms of wear rate, the differences between the aged and the virgin specimens were slightly higher, the progressive testing conditions allowed to reveal the formation of different wear mechanisms at different wear cycles. Additionally, information on the polymer morphology such as degree of crystallinity, and an evaluation on the polymer degradation was done using Differential Scanning Calorimetry (DSC) and Fourier Transform Infrared Spectroscopy (FTIR). The results obtained with these methods were correlated with the friction coefficient and the wear rate, explaining the development of wear in such conditions.

Mechanical and Abrasive Wear Studies on Biobased Jatropha Oil Cake Incorporated Glass–Epoxy Composites

AbstractAn investigation was made to evaluate the effect of the incorporation of jatropha oil cake (JOC) alone and in combination with silicon carbide (SiC) on the mechanical and tribological wear behaviour of glass fabric–epoxy (GE) composites. A vacuum‐assisted resin transfer moulding (VARTM) technique was employed to obtain a series of GE composites containing different fillers viz., silicon carbide, jatropha oil cake and a mixture of SiC and JOC. The effect of different loads (22 and 32 N) and abrading distances from 135 to 540 m on the performance of the wear resistance of the composites were measured. The mechanical properties such as tensile behaviour and hardness of the composites were evaluated. A linear relationship was found between the wear volume loss and the abrading distances. The JOC filled GE composite exhibited a lower specific wear rate by 6 and 10% at 540 m abrading distance for a load of 22 and 32 N, respectively, as compared to that of unfilled GE composites. The worn surface features of unfilled and filled GE composites were examined using scanning electron microscopy (SEM).

Abrasive wear behavior of thermally sprayed diamond reinforced composite coating deposited with both oxy-acetylene and HVOF techniques

Diamond and diamond-based coatings have long been studied for their exceptional properties. Although a great deal of research has been carried out in this field, little is known about their tribological wear behavior. In the present work, diamond reinforced composite (DRC) coatings of varying diamond content was deposited on mild steel substrates using both oxy-acetylene (OA) and high velocity oxy fuel (HVOF) thermal spraying techniques. The high stress abrasive wear behavior of these coatings is studied by performing two body abrasion tests for varying experimental parameters. It is observed that the HVOF-sprayed coatings suffered abrasion at a relatively low wear rate. The reasons for variations observed in the wear rate as a function of displacement during abrasion and grit size could be attributed to the deterioration of abrasive particles and the particle size effect respectively. While the disparity in the wear rates with respect to composition of the coatings was primarily controlled by the diamond content in the coating. The abrasive wear mechanism was found to be the same in both the coatings except that the coating deposited by HVOF spray technique, offered better abrasion resistance and therefore abraded at a slower rate. This is possibly due to lower porosity in the coating and higher bond strength between reinforced diamond particulates and the bronze matrix in HVOF-sprayed specimens.

Tribological wear behavior of diamond reinforced composite coating

In the present study, diamond reinforced composite (DRC) coating has been applied on mild steel substrate using thermal spray coating technique. The composite powder consists of diamond, tungsten carbide, and bronze, which was mixed in a ball mill prior deposition by thermal spray. The microstructure and the distribution of diamond and tungsten carbide particle in the bronze matrix were studied. The DRC-coated mild steel substrates were assessed in terms of their high stress abrasive wear and compared with that of uncoated mild steel substrates. It was observed that when sliding against steel, the DRC-coated sample initially gains weight, but then loses the transferred counter surface material. In case of abrasive wear, the wear rate was greatly reduced due to the coating; wherein the wear rate decreased with increase in diamond content.

Fundamental properties and tribological wear behaviour of sputtered CrCrN coatings on light metals

CrN hard coatings were deposited by sputtering onto pure titanium alloy TiA 16V4 in order to improve the wear protection and the oxidation resistance of the substrate materials. To obtain dense coatings with high hardness and good adhesion to the substrate, the bias voltages (r.f., d.c.) were varied systematically and different thin intermediate layers (chromium, NiCr) were deposited prior to sputtering of the CrN coatings. Furthermore, the influence of thermoshock treatment (fast cooling from 700 C to 10 C in water) on the film properties was analysed. The wear behaviour of the coatings was evaluated using a plate on cylinder model wear test apparatus.