Tribological Performance of a Non Asbestos Organic Brake Pad Using Various Organic and Mineral Fibers

2012 ◽  
Vol 585 ◽  
pp. 559-563
Author(s):  
M.A. Sai Balaji ◽  
K. Kalaichelvan
Keyword(s):  
Wear Behavior ◽  
Testing Machine ◽  
Brake Disc ◽  
Brake Pads ◽  
Degradation Temperature ◽  
Industrial Standards ◽  
Worn Surface ◽  
Acrylic Fibers ◽  
Automotive Brake

Non-Asbestos organic composite friction materials are increasingly used in automotive brake disc pad applications. The present paper deals with the role of various organic fibers Kevlar, Acrylic fibers and the Rock fiber namely the Lapinus fiber on the fade and recovery behavior of friction composites. Three different friction composites were developed with same formulation varying only the percentage of Kevlar, Acrylic and lapinus fibers within the formulation. The formulations containing 13.5% of these fibers were developed as brake pads and designated as NA01, NA02 and NA03 respectively. The chemical and Mechanical properties are tested as per Indian Industrial standards.. The composites are then tested for the tribo-performance using Chase Testing Machine following SAE J661a standards. The fade µ, recovery µ and wear are significantly influenced by the amount and type of fiber combinations. Also the TGA reveals the degradation temperature of these fibers. Composite NA 03 containing Kevlar and lapinus combination is found to have good tribo performance. Worn surface analysis by SEM has proved to be useful in understanding the wear behavior of the composites.

scholarly journals The Role of Graphitic Carbon Nitride in the Formulation of Copper-Free Friction Composites Designed for Automotive Brake Pads

Metals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 123
Author(s):  
Vlastimil Matějka ◽  
Mara Leonardi ◽  
Petr Praus ◽  
Giovanni Straffelini ◽  
Stefano Gialanella
Keyword(s):  
Carbon Nitride ◽  
Room Temperature ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Main Role ◽  
Brake Pads ◽  
Pin On Disc ◽  
Brake Lining ◽  
Automotive Brake

In this study, graphitic carbon nitride (g-C3N4, labelled as gCN) was tested in the formulation of copper-free (Cu-free) friction mixtures, which are potentially interesting for brake pad manufacturing. Three formulations of friction composites were prepared starting from a common Cu-free master batch: (i) without graphite, (ii) with graphite and (iii) with gCN. The mixtures were pressed in the form of pins by hot-press moulding. The friction-wear performance of the prepared pins was investigated using a pin-on-disc (PoD) test at room temperature (RT), high temperature (HT) (400 °C) and, again, at room temperature (H-RT). The values of the friction coefficient (µ) for the composites with gCN (or graphite) were as follows: (i) RT test, µRT = 0.52 (0.47); (ii) HT test, µHT = 0.37 (0.37); (iii) RT after the HT tests, µH-RT = 0.49 (0.39). With respect to wear resistance, the samples with graphite performed better than the samples without this solid lubricant. To the best of our knowledge, this is the first report regarding the evaluation of the role of gCN in friction composites designed for automotive brake lining applications. The results indicate the main role of gCN as a soft abrasive.

Study on Friction and Wear Behavior of GCr15/1045 Steel under Nano-Particle Additive Conditions

2011 ◽  
Vol 189-193 ◽  
pp. 38-41
Author(s):  
Wen Jian Wang ◽  
Hong Zhuo ◽  
Jun Guo ◽  
Qi Yue Liu
Keyword(s):  
Friction And Wear ◽  
Wear Behavior ◽  
The Self ◽  
Nano Particles ◽  
Nano Particle ◽  
Friction And Wear Behavior ◽  
Repairing Effect ◽  
1045 Steel ◽  
Worn Surface

The aim of this study was to investigate the friction and wear behavior of GCr15/1045 steel under different nano-particle additive conditions using a reciprocating horizontal tribometer. The results indicate that the nano-particle additives could decrease friction coefficient of CGr15/1045 steel and reduce the wear of material compared with the dry condition. Nano-particles play an important role of polishing the micro-gibbosity of contact surfaces during the friction process. The nano-particles of Ca10(PO4)6, TiO2 and TiN can form the self-repairing film on the worn surface of 1045 steel. The analysis indicates that the self-repairing effect of nano-particle of TiN is best and the self-repairing effect of nano-particle of TiO2 is worst.

INFLUENCE OF MOLYBDENUM DISULFIDE PARTICLE SIZE ON FRICTION AND WEAR CHARACTERISTICS OF NON-ASBESTOS-BASED COPPER-FREE BRAKE FRICTION COMPOSITES

2019 ◽  
Vol 27 (01) ◽  
pp. 1950085 ◽  
Author(s):  
R. VIJAY ◽  
D. LENIN SINGARAVELU ◽  
PETER FILIP
Keyword(s):  
Thermal Stability ◽  
Particle Size ◽  
Molybdenum Disulfide ◽  
Heat Dissipation ◽  
Wear Behavior ◽  
Brake Pads ◽  
Thermogravimetric Analyzer ◽  
Industrial Standards ◽  
Friction And Wear Characteristics ◽  
Composite Samples

Molybdenum disulfide is a successful solid lubricant because of its cleavage of the basal plane at the time of sliding, which helps to retain the lubrication nature in order to reduce wear and to maintain frictional stability. Thus the present study deals with the development of copper-free brake pads using molybdenum disulfide that possesses different grades based on the particle size, namely, technical (coarse), fine and superfine. The brake pads were developed using conventional manufacturing processes and characterized for its physical, chemical, thermal and mechanical properties as per industrial standards. Thermal stability was measured for the varying ingredients and the developed composites using thermogravimetric analyzer instrument. The tribological studies were done using Chase testing following IS2742 Part-4 standards. The results showed that coarse-sized (technical grade) molybdenum disulfide-based brake pads possess better thermal stability with good fade and recovery characteristics in turn leading to less wear when compared with the other two composites. This is because of its better heat dissipation and superior lubricating nature. Scanning electron microscopy and energy dispersive analysis were helpful in studying the wear behavior of the Chase-tested brake friction composite samples.

scholarly journals Experimental Evaluation of Brake Pad Material Propensity to Stick-Slip and Groan Noise Emission

Lubricants ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 107 ◽  
Author(s):  
Alessandro Lazzari ◽  
Davide Tonazzi ◽  
Giovanni Conidi ◽  
Cristian Malmassari ◽  
Andrea Cerutti ◽  
...  
Keyword(s):  
Low Frequency ◽  
Dynamic Responses ◽  
Brake Disc ◽  
Frequency Noise ◽  
Brake Pad ◽  
Noise Emission ◽  
Stick Slip ◽  
Brake Pads ◽  
Noise Vibration ◽  
Worn Surface

Frictional and dynamic responses of brake pad materials, when sliding on brake disc counterfaces, are at the origin of noise, vibration and harshness (NVH) issues such as brake noise emissions. In more detail, groan is a low frequency noise emission often associated to the stick-slip frictional response of the brake system. The instability of such contact is the result of the coupling between the system dynamics and the frictional response of the materials in contact. In this work, an experimental approach is proposed for measuring the frictional response and the propensity to generate stick-slip of different lining materials, coming from commercial brake pads, when sliding on a worn surface of a brake disc, under the same controlled boundary conditions. The proposed methodology allowed for comparing the propensity of the tested pad materials to stick-slip vibrations, which is in agreement with feedback from automotive industry on groan emission.

Influence of natural barytes purity levels on the tribological characteristics of non-asbestos brake pads

2019 ◽  
Vol 72 (3) ◽  
pp. 349-358 ◽  
Author(s):  
Vijay R. ◽  
Manoharan S. ◽  
Lenin Singaravelu D.
Keyword(s):  
Tribological Performance ◽  
Impurity Level ◽  
Mechanical And Thermal Properties ◽  
Industrial Practice ◽  
Content Type ◽  
Brake Pads ◽  
Purity Level ◽  
Brake Dynamometer ◽  
Industrial Standards ◽  
Worn Surface

Purpose This paper aims to deal with the effect of natural barytes purity levels on the tribological performance of brake pads. Design/methodology/approach In this study, brake pads were developed by varying three different natural barytes without varying other ingredients. The brake pads were developed as per the standard industrial practice. The physical, mechanical and thermal properties of the developed brake pads were tested as per the industrial standards. The tribological properties were analyzed using a full-scale inertia brake dynamometer. Worn surface analysis was done using scanning electron microscope coupled with elemental mapping. Findings The experimental results indicate that the brake pads filled with natural barytes 95% purity had good physical, chemical and mechanical properties with stable friction and less wear rate due to reduced impurity level preventing frictional undulations. Originality/value This paper explains the effect of the purity level of natural barytes in brake pads formulation to enhance the tribological performance by altering tribofilms and preventing friction undulations.

Investigation on tribological and corrosion characteristics of oxide-coated steel and mild steel fiber-based brake friction composites

2019 ◽  
Vol 71 (3) ◽  
pp. 341-347 ◽  
Author(s):  
Manoharan S. ◽  
Vijay R. ◽  
Lenin Singaravelu D. ◽  
Mohamed Kchaou
Keyword(s):  
Corrosion Resistance ◽  
Mild Steel ◽  
Oxide Coating ◽  
Steel Fibers ◽  
Coated Steel ◽  
Content Type ◽  
Brake Pads ◽  
Normal Water ◽  
Industrial Standards ◽  
Worn Surface

PurposeThe purpose of this work is to investigate the effect of oxide-coated steel in comparison with mild steel fibers on the tribological and corrosion performances of friction composites.Design/methodology/approachIn this study, the friction composites were developed in the form of standard brake pads by using oxide-coated steel and compared with mild steel fibers-based one without varying the other ingredients. The brake pads were developed as per the industrial procedure. The physical, mechanical, thermal properties of the developed brake pads were analyzed as per the industrial standards. The tribological properties were analyzed using the Chase test. The worn surface analysis was done using scanning electron microscope. Corrosion behavior was also analyzed in both salt and normal water conditions.FindingsThe experimental results indicate that the oxide-coated steel-based friction composites brake pads possess good physical, chemical, thermal, corrosion resistance and mechanical properties with stable fade and recovery characteristics because of its oxide coating and flake morphology.Originality/valueThis paper explains the influence of oxide-coated steel in friction composites for enhancing the tribological performance and corrosion resistance by its oxide coating and flake morphology which could potentially replace mild steel fibers-based problems in friction composites.

Wear behavior of rice straw powder in automotive brake pads

2021 ◽  
Vol 63 (5) ◽  
pp. 458-461
Author(s):  
İbrahim Mutlu ◽  
Ahmet Keskin
Keyword(s):  
Rice Straw ◽  
Wear Behavior ◽  
Friction Material ◽  
Silica Content ◽  
Brake Pad ◽  
Brake Pads ◽  
The Matrix ◽  
Novel Material ◽  
Detrimental Impact ◽  
Automotive Brake

Abstract This paper investigates the use of rice straw powder in a brake pad as a substitute for asbestos which is a carcinogenic with detrimental effects on health. Rice straw powder was used as a novel material in a brake pad. Rice straw powder has a silica content which gives the pad a c eramic-like action. Rice straws were ground after drying in order to produce the powder. Five laboratory varieties were produced, altering the rice straw powder ingredients from 5, 10, 15, 20 and 25 wt.-%, respectively added to other abrasive materials, binder, friction modifiers, solid lubricant, and filler material utilizing conventional techniques. In this study, the friction surface temperature, the wear amount, and the change of the friction coefficient were determined. Additionally, the microstructure specifications of the brake pads were determined using scanning electron microscopy. Experimental results showed that a 15 wt.-% fraction of rice straw powder yielded better wear and thermo-mechanical features as compared with other combinations. The micro-structure shows a uniform distribution of the rice straw powder in the matrix. Hence, rice straw powder can be a possible candidate friction material for producing non-asbestos new brake pad without any detrimental impact.

The effect of reduced contact area on the occurrence of disc brake squeals for an automotive brake pad

2000 ◽  
Vol 214 (5) ◽  
pp. 561-568 ◽  
Author(s):  
F Bergman ◽  
M Eriksson ◽  
S Jacobson
Keyword(s):  
Contact Area ◽  
Friction Material ◽  
Contact Length ◽  
Brake Disc ◽  
Brake Pad ◽  
Surface Geometry ◽  
Brake Pads ◽  
Trailing Edges ◽  
Squeal Noise ◽  
Automotive Brake

Three sets of brake pads were subjected to a series of squeal tests. The pad area in contact with the brake disc was successively reduced down to 50 per cent of the original by removal of friction material either at the leading and trailing edges, at the outer and inner edges or spotwise removal of interior area by drilling. The pad surface geometry strongly affected the occurrence of brake squeals, with a significant reduction for all three pads with 50 per cent contact area. However, the average squeal noise level seems to be controlled by the pad contact length in the sliding direction.

Tribological and dynamical analysis of a brake pad with multiple blocks for a high-speed train

2019 ◽  
Vol 234 (11) ◽  
pp. 1771-1788
Author(s):  
YK Wu ◽  
JL Mo ◽  
B Tang ◽  
JW Xu ◽  
B Huang ◽  
...  
Keyword(s):  
High Speed ◽  
Wear Behavior ◽  
Dynamical Analysis ◽  
Brake Disc ◽  
Brake Pad ◽  
High Speed Train ◽  
Brake Squeal ◽  
Element Analysis ◽  
Single Block ◽  
Middle Ring

In this research, the tribological and dynamical characteristics of a brake pad with multiple blocks are investigated using experimental and numerical methods. A dynamometer with a multiblock brake pad configuration on a brake disc is developed and a series of drag-type tests are conducted to study the brake squeal and wear behavior of a high-speed train brake system. Finite element analysis is performed to derive physical explanations for the observed experimental phenomena. The experimental and numerical results show that the rotational speed and braking force have important influences on the brake squeal; the trends of the multiblock and single-block systems are different. In the multiblock brake pad, the different blocks exhibit significantly different magnitudes of contact stresses and vibration accelerations. The blocks located in the inner and outer rings have higher vibration acceleration amplitudes and stronger vibration energies than the blocks located in the middle ring.

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