ABRASIVE WEAR ANALYSIS ON GRAPHENE OXIDE-BASED HYBRID NANOPOLYMER COMPOSITES

2019 ◽  
Vol 26 (03) ◽  
pp. 1850156
Author(s):  
GEETHA RAJAMANI ◽  
JAWAHAR PAULRAJ
Keyword(s):  
Graphene Oxide ◽  
Abrasive Wear ◽  
Mechanical Tests ◽  
Hybrid Nanocomposites ◽  
Wear Testing ◽  
Flexural Property ◽  
Injection Molding Process ◽  
Molding Process ◽  
Pin On Disc ◽  
The Coefficient Of Friction

Nylon ([Formula: see text]), Glass-filled nylon (GFN) composites and hybrid graphene oxide blended GFN (GO-GFN) nanocomposites plates were prepared by blending and subsequent injection molding process. Mechanical tests were conducted to study the tensile property, flexural property and hardness of nylon, GFN and GO-GFN system. The fabricated plates were subjected to abrasive wear testing in Pin-on-disc tribometer. The pin used is aluminium oxide (Al2O3) ceramic tool. The coefficient of friction, frictional force and loading variations were observed and studied to analyze the susceptibility of nylon, GFN and GO-GFN nanopolymer composites for abrasive wear conditions. This experimental study confirmed the enhancement in the abrasive wear resistance behavior of GO-GFN hybrid nanocomposites.

Preparation and properties of novel sulfonic graphene oxide–epoxy resin nanocomposites by resin transfer molding process

2016 ◽  
Vol 51 (9) ◽  
pp. 1197-1208 ◽  
Author(s):  
Wei Li ◽  
Hongyu Li ◽  
Xinguo Yang ◽  
Wei Feng ◽  
Hongyun Huang
Keyword(s):  
Graphene Oxide ◽  
Impact Strength ◽  
Epoxy Resin ◽  
Curing Temperature ◽  
Flexural Property ◽  
Oxide Content ◽  
Molding Process ◽  
One Pot ◽  
Epoxy Resin Nanocomposites ◽  
The Impact

This paper reported a facile one-pot strategy for fabrication of sulfonic graphene oxide–epoxy resin nanocomposites. The rheological and thermal properties were employed to characterize the viscosity and the curing temperature of epoxy resin. Fourier transform infrared spectra for sulfonic graphene oxide and nanocomposites indicated that the sulfonic graphene oxide contains chemical cross-linking responsible for better interactions with the epoxy resin. The state of dispersion was evaluated at different scales by still picture camera and scanning electron microscopy (SEM). Tensile property tests indicated that the tensile strength and elasticity modulus of sulfonic graphene oxide–epoxy resin nanocomposites decreased slowly with increasing of sulfonic graphene oxide content. The critical flexural property and impact strength of epoxy resin filled with sulfonic graphene oxide nanocomposites were measured. The content, size, and dispersion state of sulfonic graphene oxide were examined. It was found that the content of sulfonic graphene oxide has greater impact on both flexural property and impact strength of nanocomposites compared with other conditions. For instance, the impact strength increased by 113.0% and the flexural strength and modulus increased by 39.3% and 55.7% using 1 wt.% sulfonic graphene oxide as compared to neat epoxy resin.

Effect of Heat Treatment on the Structure, Wear and Corrosion of AISI L6 Tool Steel

2021 ◽  
Vol 406 ◽  
pp. 448-456
Author(s):  
Oualid Ghelloudj ◽  
Amel Gharbi ◽  
Djamel Zelmati ◽  
Khedidja Bouhamla ◽  
Chems Eddine Ramoul ◽  
...  
Keyword(s):  
Tool Steel ◽  
Tribological Behavior ◽  
Wear Testing ◽  
Wear And Corrosion ◽  
Hardening Treatment ◽  
Pin On Disc ◽  
The Coefficient Of Friction ◽  
Hardened Tool Steel ◽  
Hardness Increase ◽  
Steel Hardening

This work is a contribution in analyzing structure, tribological behavior and corrosion of AISI L6 hardened tool steel. Structural characterization and tribological behavior of steel were investigated using Optical Microscopy (OM), Scanning electron microscopy (SEM), wear testing by friction on a pin-on-disc Tribometer and corrosion by potentiodynamic polarization. Comparing to the as-received steel, hardening has generated a fine martensitic microstructure causing a 1.5 times hardness increase. Hardening has contributed to improvement of wear resistance as the coefficient of friction has decreased from 0.86 to 0.67μ. An increase in corrosion resistance was observed after hardening treatment.

scholarly journals Tribology properties of hybrid graphene oxide materials as lubricant additives

2018 ◽  
Vol 226 ◽  
pp. 03019
Author(s):  
Anastasia A. Novikova ◽  
Victoria E. Burlakova ◽  
Valery N. Varavka ◽  
Tatyana G. Statsenko ◽  
Grigory B. Kharitonov ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Coefficient Of Friction ◽  
Hybrid Material ◽  
Copper Oxide Nanoparticles ◽  
Frictional Contacts ◽  
Pin On Disc ◽  
The Coefficient Of Friction ◽  
Isopropanol Solution ◽  
Uv Visible ◽  
Synthesized Materials

Graphene oxide was synthesized by the modified Hammers method. With managed hydrolysis in isopropanol solution obtained hybrid material “graphene oxide - copper oxide nanoparticles”. The phase composition of the hybrid material was studied by X-ray phase analysis and UV-visible spectroscopy. By ultrasonic processing dispersions of synthesized materials in glycerol were produced. The concentration of lubricating additives in the lube oil was 0.05 wt. %. The tribological properties of dispersions were investigated using a pin-on-disc friction machine. Tests showed that in the presence of graphene oxide, the friction coefficient was ~0.02, while with the addition of a hybrid material, the coefficient of friction was ~0.035. This is due to various mechanisms of lubrication. Reduction of the coefficient of friction in the presence of graphene oxide is associated with the formation of tribocarbon on the porosity of frictional contacts. While the addition of a hybrid material containing the CuO nanoparticles leads to the formation of a third body.

Wear analysis on EN8, EN9 and EN24

2017 ◽  
Vol 14 (3) ◽  
pp. 188-192
Author(s):  
Suraj R. ◽  
Jithish K.S.
Keyword(s):  
Wear Testing ◽  
Wear Behaviour ◽  
Wear Properties ◽  
Content Type ◽  
Wear Analysis ◽  
Use Wear ◽  
Specific Dimension ◽  
Pin On Disc ◽  
The Coefficient Of Friction ◽  
Time Required

Purpose This paper aims to present a comparative study of the wear properties of ferrous welded materials like EN8, EN9 and mild steel (MS). Design/methodology/approach The material is cut into specific dimension after hardfacing and is studied for the wear properties of the material. The wear testing is done on a pin-on-disc apparatus. The microhardness of the material is studied using the Vickers microhardness measuring apparatus. Findings The wear properties of ferrous welded materials like EN8, EN9 and MS are studied. It is found the MS has the least wear when compared to EN8 and EN9. The microhardness of MS is higher than EN8 and EN9, thus making it more wear-resistant than EN8 and EN9. The coefficient of friction in the dry sliding condition is found to be constant throughout the experiment. Research limitations/implications Major restriction is the amount of time required for use-wear analysis and replication experiments that are necessary to produce reliable results. These limitations mean that the analysis of total assemblages with the intention of producing specific results, especially of worked materials, is not feasible. Practical implications Generally, the complexity and rigour of the analysis depend primarily on the engineering needs and secondarily on the wear situation. It has been the author’s experience that simple and basic wear analyses, conducted in the proper manner, are often adequate in many engineering situations. Integral and fundamental to the wear analysis approach is the treatment of wear and wear behaviour as a system property. As a consequence, wear analysis is not limited to the evaluation of the effects of materials on wear behaviour. Wear analysis often enables the identification of nonmaterial solutions or nonmaterial elements in a solution to wear problems. For example, changes in or recommendations for contact geometry, roughness, tolerance and so on are often the results of a wear analysis. Originality/value The value of the work lies in the utility of the results obtained to researchers and users of the EN8, EN9 and EN24 material for their components.

Comparative Investigations on the Mechanical and Tribological Properties of Glass Fibre Reinforced Thermoplastic and Blended Graphene-Oxide Hybrid Thermoplastic Nanocomposites

2014 ◽  
Vol 591 ◽  
pp. 85-88 ◽  
Author(s):  
R. Geetha ◽  
Paulraj Jawahar
Keyword(s):  
Graphene Oxide ◽  
Coefficient Of Friction ◽  
Tribological Properties ◽  
Film Formation ◽  
Processing Temperature ◽  
Mechanical And Tribological Properties ◽  
Base Materials ◽  
Pin On Disc ◽  
The Coefficient Of Friction ◽  
Glass Fibre Reinforced

Glass filled nylon composites (GFN) and hybrid graphene oxide reinforced glass filled Nylon nanocomposites (GO-GFN) are prepared by blending the required base materials in injection molding machine at processing temperature of 275°C. The specimens prepared are subjected to various mechanical property tests to reveal their hardness, tensile strength and flexural strength. The wear discs of GFN and GO-GFN composites as per ASTM standard are injection molded to analyze the tribological properties using pin on disc tribometer. The pin used is EN 8 Tool steel. The Coefficient of friction for the GFN composites for the wear load of 10 N is 0.28. Addition of 0.003 wt% GO to the GFN system has decreased the coefficient of friction significantly to the value of 0.12. The decrease in C.O.F was correlated with the adhesion film formation in the pin surface. This work confirms the improvement in wear resistance of GO-GFN system which is attributed by the presence of graphene oxide only.

Abrasive Wear Performance of Aluminium Modified Epoxy-Glass Fiber Composites

2015 ◽  
Vol 03 (03n04) ◽  
pp. 1550005 ◽  
Author(s):  
Vikram G. Kamble ◽  
Punyapriya Mishra ◽  
Hassan A. Al Dabbas ◽  
H. S. Panda ◽  
Johnathan Bruce Fernandez
Keyword(s):  
Abrasive Wear ◽  
Glass Fiber ◽  
Wear Behavior ◽  
Fiber Composite ◽  
Matrix Material ◽  
Testing Machine ◽  
Wear Testing ◽  
Aluminum Particles ◽  
Pin On Disc ◽  
Modified Epoxy

For a long time, Aluminum filled epoxies molds have been used in rapid tooling process. These molds are very economical when applied in manufacturing of low volume of plastic parts. To improve the thermal conductivity of the material, the metallic filler material is added to it and the glass fiber improves the wear resistance of the material. These two important parameters establish the life of composites. The present work reports on abrasive wear behavior of Aluminum modified epoxy and glass fiber composite with 5 wt.% and 10 wt.% of aluminum particles. Through pin on disc wear testing machine, we studied the wear behaviors of composites, and all these samples were fabricated by using hand layup process. Epoxy resin was used as matrix material which was reinforced with Glass fiber and Aluminum as filler. The composite with 5 wt.% and 10 wt.% of Al was cast with dimensions 100 × 100 × 6 mm. The specimens were machined to a size of 6 × 6 × 4 mm for abrasive testing. Abrasive tests were carried out for different grit paper sizes, i.e., 150, 320, 600 at different sliding distance, i.e., 20, 40, 60 m at different loads of 5, 10 and 15 N and at constant speed. The weight loss due to wear was calculated along with coefficient of friction. Hardness was found using Rockwell hardness machine. The SEM morphology of the worn out surface wear was analyzed to understand the wear mechanism. Results showed that the addition of Aluminum particles was beneficial for low abrasive conditions.

scholarly journals The effect of temperature and chemical solutions on the Compressive strength of particulate hybrid composites

2014 ◽  
Vol 11 (4) ◽  
pp. 1467-1474
Author(s):  
Baghdad Science Journal
Keyword(s):  
Composite Materials ◽  
Hybrid Composite ◽  
Hybrid Composites ◽  
Mechanical Tests ◽  
Effect Of Temperature ◽  
Injection Molding Process ◽  
Alumina Powder ◽  
Molding Process ◽  
Different Temperatures ◽  
Chemical Solutions

In this work a hybrid composite materials were prepared containing matrix of polymer (polyethylene PE) reinforced by different reinforcing materials (Alumina powder + Carbon black powder CB + Silica powder). The hybrid composite materials prepared are: • H1 = PE + Al2O3 + CB • H2 = PE + CB + SiO2 • H3 = PE + Al2O3 + CB + SiO2 All samples related to electrical tests were prepared by injection molding process. Mechanical tests include compression with different temperatures and different chemical solutions at different immersion times The mechanical experimentations results were in favour of the samples (H3) with an obvious weakness of the samples (H1) and a decrease of these properties with a rise in temperature and the increasing of the immersion times in the chemical solutions.

scholarly journals Mechanical and Abrasive Wear Behavior of Metal Sulphide Lubricant Filled Epoxy Composites

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
M. Sudheer ◽  
N. Karthik Madhyastha ◽  
M. Kewin Amanna ◽  
B. Jonthan ◽  
K. Mayur Jayaprakash
Keyword(s):  
Mechanical Properties ◽  
Abrasive Wear ◽  
Detrimental Effect ◽  
Wear Behavior ◽  
Wear Testing ◽  
Wear Loss ◽  
Fiber Damage ◽  
Pin On Disc ◽  
Abrasive Wear Behavior ◽  
Worn Surface

The present work reveals the effect of the addition of commercial MoS2 (10 wt%) particles on mechanical and two-body abrasive wear behavior of epoxy with/without glass fiber mat reinforcement. The composites were fabricated using casting and simple hand lay-up techniques followed by compression molding. The mechanical properties such as density, hardness, tensile, and flexural properties were determined as per ASTM standards. The abrasive wear testing was carried out using pin-on-disc wear tester for different loads and abrading distances at constant speed of 1 m/s. A significant reduction in wear loss and specific wear rate was noticed after the incorporation of MoS2 filler allowing less wear of matrix during abrasion which in turn facilitated lower fiber damage. However the incorporation of MoS2 particles had a detrimental effect on most of the mechanical properties of the composites. The worn surface features were investigated through scanning electron microscopy (SEM) in order to investigate the wear mechanisms.

scholarly journals Initial Assessment of Abrasive Wear Resistance of Austempered Cast Iron with Vermicular Graphite

2014 ◽  
Vol 59 (3) ◽  
pp. 1073-1076 ◽  
Author(s):  
M. S. Soiński ◽  
A. Jakubus
Keyword(s):  
Wear Resistance ◽  
Cast Iron ◽  
Abrasive Wear ◽  
Abrasive Wear Resistance ◽  
Initial Assessment ◽  
Cast Material ◽  
Pin On Disc ◽  
The Coefficient Of Friction ◽  
Austempering Temperature ◽  
Disc Configuration

Abstract The work compares the abrasive wear resistance of cast iron containing vermicular graphite, measured in the as-cast state and after austempering carried out at 290°C, 340°C, or 390°C. Theexaminations were performed by means of the T-01M tribological tester using the pin-on-disc configuration. Specimens used for examinations were taken from the end tabs of the tensile specimens, these being cut out of the test walls of the double-leg keel block test castings. Examinations proved that the austempering process increases the abrasive wear resistance of vermicular cast iron by several times as compared with the as-cast material. A tendency for a slight decrease in abrasive wear with an increase in austempering temperature can be stated. The coefficient of friction took a little higher values for cast iron after thermal treatment than for the as-cast material. The work was completed with roughness examination by means of electron scanning microscopy.

scholarly journals Effect of Cooling Agent on Temperature Profile During Molding Injection: Case Study for Polylactic Composites

2021 ◽  
Vol 58 (1) ◽  
pp. 228-236
Author(s):  
Raluca Isopescu ◽  
Paula Postelnicescu
Keyword(s):  
Natural Convection ◽  
Temperature Profile ◽  
Cooling Water ◽  
Mechanical Tests ◽  
Injection Molding Process ◽  
Molding Process ◽  
Cooling Channels ◽  
Cooling Agent ◽  
Time Required ◽  
Cooling Air

The paper presents a theoretical study for the cooling of polymer samples in an injection molding process. The study is applied for neat polylactic acid (PLA), PlA-talc and PLA-starch composite samples representing specimens for mechanical tests reported in literature. A one dimensional model was developed for the heat transport through the thickness of the sample from the polymer to the cooling agent: air in natural convection and water flowing through cooling channels. The heat of solidification of molten polymer was also considered. The model was solved in the frame of Matlab software. The results obtained consist in the evaluation of the final time required to reaches a temperature of about 60�C in the core of the specimen and the evaluation of the temperature profile along the cooling process. When using cooling air in natural convection the temperature profile shows insignificant space variation, but the duration of cooling is about 6 min. The use of cooling water proved to be more efficient in terms of cooling time is about 15-25s, while the temperature gradient in the thickness of the specimen is quite significant at any moment of time.

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