scholarly journals Optimization of Tribological Properties of Nonasbestos Brake Pad Material by Using Steel Wool

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
R. Vijay ◽  
M. Jees Janesh ◽  
M. A. Saibalaji ◽  
V. Thiyagarajan
Keyword(s):  
Sem Analysis ◽  
Wear Behaviour ◽  
Brake Pad ◽  
Tribological Behaviour ◽  
Steel Wool ◽  
Metallic Material ◽  
Structural Reinforcement ◽  
Pin On Disc ◽  
Low Wear ◽  
Frictional Composites

The gradual phasing out of typical brake pad material led to the spark of extensive research in development of alternatives. Henceforth we have performed a tribological study to improve the performance characteristics of the friction product (brake pad) by using steel wool, a metallic material which has an excellent structural reinforcement property and high thermal stability which are indeed required to improve the performance of the brake pad. Under the study, five frictional composites were developed and optimized using the same ingredients in an appropriate proportion except steel wool (0%, 4%, 8%, 12%, and 16%) which is compensated by synthetic barite, and the synthesized compositions are designated as Na01 to Na05. The developed pads are tested for tribological behaviour under conventional environment in a standard pin on disc tribometer. It is observed that increase in steel wool concentration resulted in high coefficient of friction and low wear rate of pad as resulted in Na05 composition. SEM analysis of the wear surface has proved to be useful in understanding the wear behaviour of the composites.

Wear Behaviour of HVOF and HVAF Sprayed Wc-Cermet Coatings

1998 ◽  
Author(s):  
L. Jacobs ◽  
M. Hyland ◽  
Μ. De Bonte
Keyword(s):  
Wear Rate ◽  
Adhesive Wear ◽  
Abrasive Particle ◽  
Wear Behaviour ◽  
Tribological Behaviour ◽  
Wear Rates ◽  
Pull Out ◽  
Pin On Disc ◽  
Low Wear ◽  
Sprayed Coatings

Abstract The tribological behaviour of WC-Co-Cr coatings deposited by HVOF and HVAF and WC-Co coating deposited by HVAF was investigated in pin-on-disc tests. Wear rates were determined and wear tracks on the coatings and counterbodies were investigated in SEM. The HVAF sprayed coatings showed greater wear resistance compared to the HVOF coatings. The main wear mechanism in the WC-Co coatings was adhesive wear. The cobalt matrix is lubricious, resulting in very low wear rates and low debris generation. The main wear mechanisms in the WC-Co-Cr coatings were adhesive and abrasive wear. Adhesive wear results in pull-outs that are trapped in the contact zone and act as a third-body abrasive. Particle pull-out of the coating significantly increases the wear rate of the coated specimen. The HVAF/WC-Co-Cr coatings proved to have a better resistance to particle pull-out which reflected in a considerably lower wear rate than the HVOFIWC-Co-Cr coatings.

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.

Wear Characteristics of Sintered Cermets

2012 ◽  
Vol 31 (1) ◽  
Author(s):  
Róbert Bidulský ◽  
Jana Bidulská ◽  
Freddy Arenas ◽  
Marco Actis Grande
Keyword(s):  
Wear Behaviour ◽  
Processing Conditions ◽  
Tribological Behaviour ◽  
Wear Performance ◽  
Normal Contact ◽  
Contact Loads ◽  
Microstructural Evaluation ◽  
Pin On Disc ◽  
Abrasive Wear Behaviour ◽  
Performance Results

AbstractThe present paper deals with the tribological behaviour of the boride and carbide hardmetals evaluated by performing comparative dry sliding pin-on-disc experiments using normal contact loads. Analyses of the wear performance results, microstructural evaluation and processing conditions effect indicate that microstructure inhomogenities play an important role in abrasive wear behaviour of cermets. In term of grain size and chemical composition, the addition of VC also play an important role in increasing the wear resistance.

Effect of ZnO Particles on Microstructure, Microhardness and Wear Behaviour of AA7068 Metal Matrix Composites Synthesized by Powder Metallurgy

2020 ◽  
Vol 979 ◽  
pp. 68-73 ◽  
Author(s):  
K. John Joshua ◽  
S.J. Vijay ◽  
P. Ramkumar ◽  
S. Mohanasundaram
Keyword(s):  
Powder Metallurgy ◽  
Vickers Microhardness ◽  
Matrix Material ◽  
Sem Analysis ◽  
Wear Behaviour ◽  
Matrix Composites ◽  
Zno Particles ◽  
The Matrix ◽  
Pin On Disc ◽  
Worn Surface

AA7068/ZnO composites were synthesized by powder metallurgy technique with different weight percentages of ZnO (5%, 10%, and 15%) along with as sintered AA7068. A low pressure of 318 MPa was applied for compaction and sintered at a temperature of 560°C for one hour. Microstructural behavior was studied using optical microscopy. Vickers microhardness test was conducted to find out the microhardness. Using pin-on-disc wear-tester experiments were conducted with a velocity of 1.2 m/s over a sliding distance of 2.5 km of load 5 N. Scanning Electron Microscopy (SEM) analysis was carried out to investigate the worn surface. Experimental results showed that the Vickers microhardness number have been increased to 66 by addition of 15% ZnO, which was double that of the matrix material. Wear experiments revealed improved wear resistance by the addition of ZnO particles. SEM analysis exposed that abrasion, delamination and oxidation were the predominant wear mechanisms for the matrix material and AA7068-5% ZnO composite and adhesion and oxidation for composites reinforced with 10% and 15% ZnO particles.

Dry Sliding Wear of Stainless Steel Coating Obtained by Plasma on Aluminium Substrate

2011 ◽  
Vol 227 ◽  
pp. 173-176
Author(s):  
Nafissa Khanafi-Benghalem ◽  
Kamel Benghalem ◽  
Kamel Loucif ◽  
Soufyane Aounnallah ◽  
Abdelouahab Redjechta
Keyword(s):  
Stainless Steel ◽  
Complex Geometry ◽  
Wear Behaviour ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
Tribological Behaviour ◽  
Experimental Conditions ◽  
Steel Coating ◽  
Pin On Disc ◽  
Stainless Steel Coatings

It is sometimes imperative to modify the characteristics of materials surface reserved for the applications requiring the particular tribological properties in order to confer them certain specific properties such as the improvement of hardness, the corrosion resistance and the wear resistance. The use of aluminium and its alloys in mechanics is limited for their certain properties related to the surface whose principal one is very bad frictions behaviour, associated with a tendency of seizing and a strong sensitivity to the effect of wear. The deposit plasma is a technique which can cure these bad behaviours. It is particularly adapted to treat superficially parts of complex geometry and of rather significant number. Our work consists to study the wear behaviour of stainless steel coatings obtained by plasma on aluminium alloy substrates. The wear tests were carried out using a pin-on-disc apparatus under dry sliding conditions. Pin specimens were 100Cr6 stainless steel, while disc specimens were 316L stainless steel coating. A study will be undertaken on the tribological behaviour of the layers and the mechanisms of wear which control them for various experimental conditions (speeds and normal force) is defined, at four sliding speeds (44, 56.5,75.4, 94.3 m/s) and force of 20N.

Tribo-Thermal Based Evaluation of Non Asbestos Disc Brake Pad Formulation

2015 ◽  
Vol 766-767 ◽  
pp. 432-437
Author(s):  
V. Thiyagarajan ◽  
R. Vijay ◽  
K. Sivakumar ◽  
R.l. Harigovindhan
Keyword(s):  
Thermal Stability ◽  
Thermo Gravimetric Analysis ◽  
Disc Brake ◽  
Gravimetric Analysis ◽  
Brake Pad ◽  
Thermo Gravimetric ◽  
Metallic Material ◽  
Brake Pads ◽  
Structural Reinforcement ◽  
Alumina Fibre

Performance of Non Asbestos brake pad requires the optimization of numerous criteria. Alumina fibre is a metallic material which is light weight, excellent wear resistance, thermal stability and structural reinforcement properties. Hence the present work deals with the development of three friction composites in the form of standard disc brake pads using same ingredients in same proportion except alumina fiber containing 7%wt, 11%wt & 14% wt which is compensated by synthetic barites (filler) containing 16%wt, 12%wt & 9% wt and designated as NA01, NA02 and NA03 respectively. Various physical, thermal and mechanical characterizations are carried out as per IS2742 Part 3 standards in which the loss of ignition decreased while the specific gravity, compressive strength and hardness increased with the fiber increase. Then the tribological properties (Fade and Recovery) are tested using Chase Test following IS2742 Part 4 standards. The fade μ and recovery μ % were significantly influenced by the amount of fibre combinations. It was proved that, increase in amount of alumina fibre % had significant effect on fade μ %.Thermo Gravimetric Analysis (TGA) proves that higher fiber content has more thermal stability leading to good fade resistance. Over all NA03 formulation is proved as superlative performer.

Wear Behaviour of Cryogenic Treated Recycled Carbon Fibers Filled Epoxy Composite

2015 ◽  
Vol 761 ◽  
pp. 489-493 ◽  
Author(s):  
Mei Lin Law ◽  
Qumrul Ahsan ◽  
Hairul Effendy Ab Maulod ◽  
Noraiham Mohamad ◽  
Sivaraos
Keyword(s):  
Epoxy Resin ◽  
Polymer Composites ◽  
Carbon Fibers ◽  
Cryogenic Treatment ◽  
Epoxy Composites ◽  
Wear Behaviour ◽  
Tribological Behaviour ◽  
Casting Technique ◽  
Pin On Disc ◽  
The Coefficient Of Friction

Mechanically ground recycled carbon fibers (rCFs) reinforced polymer composites were investigated in this paper. The rCFs were collected from the woven prepreg waste. The as-received (rCFs-AR) and cyclic cryogenic treated (rCFs-T) carbon fibers were incorporated separately in the epoxy matrix composite. The objective of this study is to study the wear behaviour of the epoxy composites with respect to the as-received and treated rCFs. Prior to the composite fabrication, the surface morphologies of rCFs-AR and rCFs-T were examined with the scanning electron microscope (SEM). It is found that the cryogenic treatment is effective in removing the epoxy resin from the carbon fiber due to the mismatches in the thermal expansion at the interface of rCFs and epoxy. The rCFs-AR and rCFs-T were homogeneously distributed in epoxy resin through ultrasonication. The void-free samples were then fabricated using vacuum casting technique. Micro Pin-on-disc Tribotester (CM-9109) was used to test the tribological behaviour of the polymer composites. The coefficient of friction (CoF) and wear rate of epoxy composites revealed that the reinforcement effect of rCFs-T is better than that of the rCFs-AR as the incorporation of rCFs-T decreases the CoF and improves the wear resistance of epoxy composites in comparison with rCFs-AR. The tribological results clearly showed that the rCFs was a valuable product worth to be reused as reinforcement in the new composite, as the incorporation of treated rCFs was effective in improving the tribological properties of the epoxy composites.

scholarly journals Multi objective optimization of wear behaviour of Aluminum MMCs using Grey-Taguchi method

2020 ◽  
Vol 7 ◽  
pp. 16
Author(s):  
Poovalingam Muthu
Keyword(s):  
Wear Rate ◽  
Coefficient Of Friction ◽  
Weight Ratio ◽  
Stir Casting ◽  
Sem Analysis ◽  
Wear Behaviour ◽  
Dry Sliding Wear ◽  
Specific Strength ◽  
Pin On Disc ◽  
Grey Relational

In recent years, metal matrix composite (MMCs) have been receiving worldwide attention on account of their superior strength-to-weight ratio and stiffness. Among the several classes of composite materials, Aluminium matrix ceramic reinforcement composites have attracted increasing attention due to their unique properties such as better specific strength, specific stiffness, wear resistance, excellent corrosion resistance, high elastic modulus and light weight. The aim of the present investigation is to optimize the dry sliding wear parameters of Aluminum LM25 matrix reinforced with silicon carbide (SiC) (5 wt.%) and Copper (Cu) (3 wt.%) using Taguchi based grey relational analysis. In this work, the composite is prepared using stir casting method. The specimens are prepared according to ASTM standard. Using pin-on-disc apparatus, wear tests are conducted as per Taguchi's L9 orthogonal array and optimum wear parameters are identified with an objective to minimise the wear rate and coefficient of friction based on the grey relational grade. The effect of parameters on the wear rate and coefficient of friction was determined using Analysis of variance (ANOVA). Finally, the experimental results were verified using confirmation tests and the SEM analysis was carried out to study the wear mechanism.

Study and comparison of wear behaviour of Ni-Al2O3 coatings deposited by hot and cold spray

2021 ◽  
Author(s):  
Deepak Dhand ◽  
Jasmaninder Singh Grewal ◽  
Parlad Kumar
Keyword(s):  
Cold Spray ◽  
Normal Load ◽  
Sem Analysis ◽  
Wear Testing ◽  
Wear Behaviour ◽  
Boiler Steel ◽  
Spray Coatings ◽  
Pin On Disc ◽  
Constant Normal Load ◽  
Sprayed Coatings

Abstract The sliding wear of hot and cold spray nickel-alumina coatings on SA 213-T 91 boiler steel has been evaluated and compared. The investigation was conducted with pin-on-disc apparatus. The wear testing was done by varying normal loads of 30, 40, and 50N at a constant sliding velocity of 1 ms-1. Then another set of experimentation was done at different sliding velocities of 0.5, 1, and 2 ms-1 at a constant normal load of 30 N. This experimentation was designed to study the effect of varying normal loads and sliding velocities on the wear performance of coatings developed with hot and cold spray techniques. The variation of friction coefficient and wear rate with variation in normal loads and sliding velocities were plotted and analyzed. The evaluation of wear mechanisms and characteristics of Ni-Al2O3 coatings is done with the help of weight change measurements and FE-SEM analysis. The wear resistance of hot spray coatings was found better at high normal loads and sliding velocities in comparison to cold sprayed coatings.

Effect of Reinforcement and Tribological Behaviour of AA 7068 Hybrid Composites Manufactured through Powder Metallurgy Techniques

2017 ◽  
Vol 867 ◽  
pp. 19-28 ◽  
Author(s):  
J. Lakshmipathy ◽  
Subburaj Rajesh Kannan ◽  
K. Manisekar ◽  
S. Vinoth Kumar
Keyword(s):  
Sintering Temperature ◽  
Hybrid Composites ◽  
High Strength ◽  
Phase Changes ◽  
Wear Loss ◽  
X Ray Diffraction ◽  
Tribological Behaviour ◽  
Different Temperatures ◽  
Pin On Disc ◽  
Sliding Distance

In this article, an attempt was made to study the mechanical behaviour of AA7068 - 6 vol. % of MoS2 - X vol. % of WC (X = 0, 5, 10 and 15) hybrid aluminium composites produced by blend–press–sinter methodology. Compacted Powders (700MPa) were sintered at different temperatures (450 0c, 500 0c and 550 0c ) in order to find the influence of sintering temperature on mechanical properties and tribological behavior of AA7068 hybrid composites.The sintered samples have been characterized by x-ray diffraction (XRD) method for identification of phases and also to investigate the phase changes. The change in density, hardness and porosity values of composites were reported. The composite with 15 vol. % of tungsten carbide and 6 vol. % of MoS2 showed the highest hardness and density at the sintering temperature range of 550 0c. Pin-on-disc type apparatus was used for determining the wear loss occurring at different conditions. The hybridization of the two reinforcements enhanced the wear resistance of the composites, especially under high applied load, sliding distance and sliding speeds. Due to this, the hybrid aluminium composites can be considered as an outstanding material where high strength and wear-resistant components are of major importance, predominantly in the aerospace and automotive engineering sectors. The morphology of the wear debris and the worn out surfaces were analyzed to understand the wear mechanisms.

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