scholarly journals Tribological Performance of Nylon Composites with Nanoadditives for Self-Lubrication Purposes

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2253
Author(s):  
Isabel Clavería ◽  
Sofía Gimeno ◽  
Ignacio Miguel ◽  
Gemma Mendoza ◽  
Aleida Lostalé ◽  
...  
Keyword(s):  
Systematic Study ◽  
Tribological Performance ◽  
Metallic Particle ◽  
Wear Behaviour ◽  
Edx Analysis ◽  
Pin On Disc

A systematic study comparing the wear behaviour of composites with nylon matrix (PA66, PA46, PA12) and different nanoadditives and reinforcing additives (graphite, graphene, MoS2 and ZrO2) has been carried out in order to achieve a proper self-lubricant material for bearing cages. The wear characterisation was done using pin-on-disc tests, SEM and EDX analysis. The results show that better outcomes are obtained for composites based on PA12. The addition of ZrO2 offers negative values of wear due to the metallic particle transference from the counterface to the polymeric pin.

scholarly journals Investigation of graphite effect on the mechanical and tribological properties of Al 7075-SiC-graphite hybrid metal matrix composites

2020 ◽  
Vol 37 (1−2) ◽  
Author(s):  
SRIDHAR ATLA ◽  
Prasanna Lakshmi Kaujala
Keyword(s):  
Silicon Carbide ◽  
Powder Metallurgy ◽  
Tribological Properties ◽  
Metal Matrix ◽  
Ceramic Composites ◽  
Wear Behaviour ◽  
Wear Loss ◽  
Mechanical And Tribological Properties ◽  
Al 7075 ◽  
Pin On Disc

The aluminium metal matrix composite reinforced with ceramic material of Silicon carbide (SiC) has good mechanical properties. However, aluminium based ceramic composites require improvements in their lubrication and tribological properties. In this study an attempt is made in the development of a new material through powder metallurgy technique by the addition of Graphite, which acts as a solid lubricant. This work investigated the influence of graphite on the wear behaviour of Al 7075/SiC /X wt.% graphite(X=0, 5 and 10) hybrid composite. The investigation reveals the effectiveness of incorporation of graphite in the composite for gaining wear reduction. The Al 7075 (aluminium alloy 7075) reinforced with SiC –graphite were investigated. The composites were fabricated using powder metallurgy route. The microstructures, material combination, wear and friction properties were analysed by scanning electron microscopy, XRD, and pin-on-disc wear tester. The newly developed aluminium composite has significant improvements in tribological properties with a combination of 5% Silicon carbide (SiC) and 5% Graphite. The test reveals that sliding distance of 1000 m and sliding speed of 1.5 m/s with applied load of 5 N result in minimum wear loss of 0.01062g and coefficient of friction as 0.1278.

scholarly journals Influence of micro- and nanofiller contents on friction and wear behavior of epoxy composites

2017 ◽  
Vol 24 (4) ◽  
pp. 485-494 ◽  
Author(s):  
Iskender Ozsoy ◽  
Adullah Mimaroglu ◽  
Huseyin Unal
Keyword(s):  
Fly Ash ◽  
Friction And Wear ◽  
Filler Content ◽  
Wear Behavior ◽  
Tribological Performance ◽  
Epoxy Composites ◽  
Atmospheric Conditions ◽  
Wear Rates ◽  
Pin On Disc ◽  
Worn Surface

AbstractIn this study, the influence of micro- and nanofiller contents on the tribological performance of epoxy composites was studied. The fillers are micro-Al2O3, micro-TiO2, and micro-fly ash and nano-Al2O3, nano-TiO2, and nanoclay fillers. The microfillers were added to the epoxy by 10%, 20%, and 30% by weight. The nanofillers were added to the epoxy by 2.5%, 5%, and 10%. Friction and wear tests were conducted using the pin-on-disc arrangement. Tribo elements consisted of polymer pin and DIN 1.2344 steel counterface disc. A load value of 15 N, a sliding speed of 0.4 m/s, a sliding distance of 2000 m, and dry atmospheric conditions were applied to test conditions. The results show that the friction coefficients and the specific wear rates of the nanofilled composites increase as the filler content increases. For microfiller-filled epoxy composites, these values decrease as filler content increases. The tribological performance of epoxy composites is enhanced by the addition of microfillers, and the higher enhancement is reached with the addition of 30% fly ash filler. Finally, the pin and disc worn surface images show the presence of adhesive and some abrasive wear mechanisms.

Dry Sliding Friction and Wear Behaviour of Reinforced Hybrid Composites of Uniaxial Glass Fiber with Silicon Carbide, Aluminium Oxide and Graphite

2016 ◽  
Vol 852 ◽  
pp. 411-415
Author(s):  
T. Narendiranath Babu ◽  
Prasham Jain ◽  
Bipin Kumar Sharma
Keyword(s):  
Silicon Carbide ◽  
Glass Fiber ◽  
Glass Fibre ◽  
Hybrid Composite ◽  
Friction And Wear ◽  
Hybrid Composites ◽  
Aluminium Oxide ◽  
Wear Behaviour ◽  
Dry Sliding ◽  
Pin On Disc

In recent years, both industrial and academic world are focussing their attention towards the development of sustainable composites, reinforced with fibres. In particular, among the fibres that can be used as reinforcement, the uniaxial glass fiber ones represent the most interesting for their properties. The aim of this work is to illustrate the results of friction and wear behaviour of uniaxial glass fibers with silicon carbide, aluminium oxide and graphite as the fillers. Moreover, its main manufacturing technologies have been described. The major component of these hybrid composite is uniaxial glass fibre with Epoxy LY556 (Resin). Hardener HY951 is used for hardening and support. Resin + Hardener are mixed in the ratio 10:1 and the mixture made up is called Matrix. Test materials of glass Fibre with varying compositions of 15% Al2O3 + SiC and glass fibre with varying compositions of 15% Graphite + SiC have been prepared by applying the matrix on glass cloth which is wrapped around the mandrel. The samples were tested in a pin-on-disc machine to determine the friction and wear losses. Further, the samples were tested on a pin-on-disc machine and frictional characteristics were monitored by varying speed and loads. Thus, the friction and wear characteristics have also been found out for the two specimens. From the experimental test results, it is observed that Al2O3 +Sic exihibits lower wear loss than SiC + Graphite under dry sliding conditions. Based on the observations, this hybrid composite are recommended to the manufacturing of the aircraft structures.

Influence of Porosity and Alloy addition on the Wear behaviour of a Sinter-Forged C45 Steel using Taguchi Method

2020 ◽  
Author(s):  
NAVEEN EASWARAN ◽  
Shanmugam Ramasamy ◽  
Roshan Nagarajan ◽  
Ramanan Nandagopal ◽  
Sripada Ragavendra Keshava Narasimha
Keyword(s):  
Wear Resistance ◽  
Mass Loss ◽  
Wear Test ◽  
Theoretical Density ◽  
Wear Behaviour ◽  
Dry Sliding Wear ◽  
Input Parameters ◽  
Alloy Addition ◽  
Pin On Disc ◽  
Alloy Steels

Elemental powders of Atomized Iron (Fe), Carbon (C) and Molybdenum (Mo) were weighed and mixed in a pot mill to yield the composition of C45, C45-1%Mo and C45-2%Mo Steels, then compacted and sintered. The Sintered preforms had a density- 75% of the Theoretical Density. Then the Sintered preforms were subjected to densification to get two densities- 80% and 85% of the theoretical density through Forging. The sintered and densified preforms of alloy steels were subsequently machined to get the required wear test specimens.The experiments were conducted on a Pin-on-disc Tribometer, conforming to ASTM G99 standards, on a rotating EN32 disc. Using Minitab 16 software, the Dry Sliding wear experiments were planned using L27 Orthogonal Array.The % Theoretical Density of the Specimens (1-%Porosity), % Mo Addition, Load and Sliding Velocity were taken as input parameters, mass loss was the output parameter. It was observed that the increasing density of alloy steels adversely affects the wear resistance of the alloy steels and mass loss is increased. It was found that the addition of Mo significantly improves the wear resistance of the alloy steels irrespective of the densities .Empirical correlations for mass loss with respect to input parameters had been developed.

Analysis of tribological behavior of medical-grade UHMW polyethylene under dry and lubricated conditions with human body fluids using Taguchi and GRA techniques

2020 ◽  
pp. 089270572094190
Author(s):  
Omar Hussain ◽  
Babar Ahmad ◽  
Shahid Saleem
Keyword(s):  
Synovial Fluid ◽  
Human Body ◽  
Tribological Behavior ◽  
Normal Load ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Tribological Performance ◽  
Body Fluids ◽  
Optimization Techniques ◽  
Pin On Disc

The present work focuses on evaluating the tribological behavior of ultrahigh molecular weight polyethylene (UHMWPE) with 316L stainless steel and Ti6Al4V under dry and lubricated sliding conditions using human body fluids (synovial fluid and human serum). Eighteen trials of experiments were performed using a reciprocating sliding tribometer (pin-on-disc) at 37°C based on Taguchi’s L18 (21 × 32) array. The in-vitro experimental results revealed that UHMWPE offers better tribological performance under synovial fluid lubrication conditions irrespective of the counterface material. The optimization of the response variables (coefficient-of-friction (COF) and specific wear rate (WR)) was performed using optimization techniques (Taguchi and Grey relational analysis). It was revealed that Ti6Al4V counterface material under synovial fluid lubrication and normal load of 52 N exhibits the optimal tribological performance with UHWMPE. The contribution of process parameters on the COF and WR was evaluated using analysis of variance. It was established that load is the most significant parameter, affecting COF and WR.

scholarly journals The influence of contact stress on the wear of cross-linked polyethylene

2018 ◽  
Vol 232 (10) ◽  
pp. 1008-1016 ◽  
Author(s):  
Göksu Kandemir ◽  
Simon Smith ◽  
Thomas J Joyce
Keyword(s):  
Contact Stress ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Wear Particle ◽  
Contact Stresses ◽  
Wear Behaviour ◽  
Cobalt Chromium ◽  
Hip Replacements ◽  
Alternative Material ◽  
Pin On Disc

Generation of wear debris and wear particle-induced osteolysis are the main limitations of metal-on-polyethylene artificial joints. Cross-linked polyethylene has been recently used, particularly in hip replacements, as an alternative material to conventional ultrahigh molecular weight polyethylene due to its superior wear resistance. This study focused on the wear behaviour of cross-linked polyethylene under different contact stresses in order to make interpretations of its long-term in-vivo performance. A 50-station SuperCTPOD (pin-on-disc) machine was used to investigate the influence of contact stress on the wear of cross-linked polyethylene pins which were articulated against cobalt chromium discs. It was found that the wear rate of cross-linked polyethylene was lower at higher contact stresses.

Tribological Behaviour of Ceramic Coatings Formed on Titanium Alloy through Miro-Arc Oxidation Technique

2007 ◽  
Vol 353-358 ◽  
pp. 898-901 ◽  
Author(s):  
Xue Tong Sun ◽  
Cheng Xin Lin
Keyword(s):  
Ceramic Coatings ◽  
Wear Behaviour ◽  
Ti Alloy ◽  
Tribological Behaviour ◽  
Coating Structure ◽  
Wear Rates ◽  
Test Range ◽  
Pin On Disc ◽  
Micro Arc Oxidation ◽  
Wear Tests

In the present work, the wear behaviour of coatings produced on Ti-6Al-4V alloy by micro-arc oxidation method was studied. The wear tests were performed using a pin-on-disc wear machine under dry sliding conditions. It is found that the MAO coating can efficiently improve the wear-resistant performance of Ti alloy in the test range of this paper. The coated samples demonstrated wear rates up to 5-12 times lower than that of the uncoated substrates tested. The wear behaviours are deeply characterized by the variations of coating structure and composition.

ON THE EFFECT OF WOVEN GLASS FABRIC ORIENTATIONS ON WEAR AND FRICTION PROPERTIES OF POLYESTER COMPOSITE

2007 ◽  
Vol 14 (03) ◽  
pp. 489-497 ◽  
Author(s):  
B. F. YOUSIF ◽  
N. S. M. EL-TAYEB
Keyword(s):  
Wear Resistance ◽  
Friction And Wear ◽  
Tribological Performance ◽  
Glass Fabric ◽  
Low Velocity ◽  
Wear And Friction ◽  
Polyester Composite ◽  
Pin On Disc ◽  
Friction And Wear Characteristics ◽  
Worn Surfaces

In this work, tribological investigations on the neat polyester (NP) and woven (600 g/m2)-glass fabric reinforced polyester (WGRP) composite were carried out. Friction and wear characteristics of the WGRP composite were measured in three principal orientations, i.e., sliding directions relative to the woven glass fabric (WGF) orientations in the composites. These are longitudinal (L), transverse (T), and parallel (P) orientations. The experiments were conducted using a pin-on-disc (POD) machine under dry sliding conditions against a smooth stainless steel counterface. Results of friction coefficient and wear resistance of the composites were presented as function of normal loads (30–100 N) and sliding distances (0.5–7 km) at different sliding velocities, 1.7, 2.8, and 3.9 m/s. Scanning electron microscopy (SEM) was used to study the mechanisms of worn surfaces. Experimental results revealed that woven glass fabric improved the tribological performance of neat polyester in all three tested orientations. In L-orientation, at a low velocity of 1.7 m/s, WGRP exhibited significant improvements to wear resistance of the polyester composite compared to other orientations. Meanwhile, at high velocities (2.8 and 3.9 m/s), T-orientation gave higher wear resistance. SEM microphotographs showed different damage features on the worn surfaces, i.e., deformation, cracks, debonding of fiber, and microcracks.

scholarly journals Wear Behaviour of SAE 4340 Steel in Comparison with Single Test Specimen

2020 ◽  
Vol 12 (3) ◽  
pp. 219-228
Author(s):  
Nadendla SRINIVASABABU
Keyword(s):  
Wear Behavior ◽  
Wear Test ◽  
Steel Specimen ◽  
Wear Behaviour ◽  
Progressive Damage ◽  
Test Machine ◽  
Loading Test ◽  
Test Speed ◽  
4340 Steel ◽  
Pin On Disc

This study addresses the progressive damage of a surface/specimen/component caused by another substance in relative motion. This could cause the change in geometry, dimensions of the part which loses the practical functionality. So, an attempt was made to study the wear behavior of SAE 4340 steel using a pin-on-disc wear test machine at different loading, test speed, and time. Two cases viz. (1) single steel specimen, (2) multiple specimens were considered for the wear test and the obtained wear (μm), and frictional force (N) was compared.

Tribological Performance of Polymer Composite Coatings Modified With La2O3 and MoS2 Nanoparticles

2019 ◽  
Vol 141 (11) ◽  
Author(s):  
Dongya Zhang ◽  
Zhongwei Li ◽  
Feng Gao ◽  
Xian Wei ◽  
Yuquan Ni
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Composite Coating ◽  
Polymer Composite ◽  
Polyvinylidene Fluoride ◽  
Composite Coatings ◽  
Tribological Performance ◽  
Pin On Disc ◽  
Mos2 Nanoparticles ◽  
Babbitt Alloy

Abstract In this study, composite coatings of polyvinylidene fluoride (PVDF) and epoxy resin deposited with La2O3 and MoS2 nanoparticles on the surface of a Babbitt alloy have been studied in order to improve its tribological performance. A pin-on-disc tribometer was used to evaluate the tribological properties of the Babbitt alloys with and without the composite coatings. The results showed that compared with the polymer-La2O3 composite coating, the polymer-MoS2 composite coating was more effective in reducing the friction coefficient and the wear rate of the Babbitt substrate under both dry and boundary lubrication conditions compared with the polymer-La2O3 composite coating. However, the wear rate of the Babbitt alloy with the polymer-La2O3 composite coating was lower than that of the alloy with the polymer-MoS2 composite coating. The wear scratches were analyzed using a scanning electron microscope (SEM). The worn surface of the polymer-La2O3 coating was much smoother and more continuous than that of the polymer-MoS2 coating, meanwhile transfer films were respectively detected on the pin surfaces. The addition of nanoparticles can reduce the wear rate and friction coefficient of polymer composite coating by forming a transfer film. Hence, the polymer composite coating can protect the Babbitt substrate.

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