Influence of WS2/SnS2 on the tribological performance of copper-free brake pads

2019 ◽  
Vol 71 (3) ◽  
pp. 398-405 ◽  
Author(s):  
Justin Antonyraj I. ◽  
Vijay R. ◽  
Lenin Singaravelu D.
Keyword(s):  
Thermal Stability ◽  
Profile Analysis ◽  
Film Formation ◽  
Three Dimensional ◽  
Solid Lubricants ◽  
Tribological Performance ◽  
Mechanical And Thermal Properties ◽  
Content Type ◽  
Brake Pads ◽  
Lubrication Film

Purpose The purpose of this study is to investigate the influence of solid lubricants (tungsten disulfide [WS2]/ Tin disulfide [SnS2]) on the tribological performance of brake pads. Design/methodology/approach In this study, the brake pads were developed by varying the solid lubricants (WS2/SnS2) without varying the other ingredients. The brake pads were developed as per the industrial procedure. Thermal stability was found for varying ingredients and developed pads. The physical, mechanical and 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 microscopy, elemental mapping and three-dimensional profile analysis. Findings The experimental results indicate that the WS2-based brake pads possess good physical, chemical and mechanical properties with stable friction and less wear rate due to its good lubrication film formation and thermal stability natures of WS2. Originality/value This paper explains the effect of solid lubricants in brake pads for enhancing the tribological performance by the shearing of crystal structure, thermal stability and tribo film properties of the lubricants.

Influence of premixed dual metal sulfides on the tribological performance of copper-free brake friction materials

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Vijay R. ◽  
Manoharan S. ◽  
Nagarajan S. ◽  
Lenin Singaravelu D.
Keyword(s):  
Thermal Stability ◽  
Peer Review ◽  
Tribological Performance ◽  
Metal Sulfides ◽  
Mechanical And Thermal Properties ◽  
Friction Materials ◽  
Content Type ◽  
Good Thermal Stability ◽  
Brake Pads ◽  
Dual Metal

Purpose The purpose of this study is to deals with the effect of premixed dual metal sulfides (tin disulfide + iron disulfide) as a replacement for antimony trisulfide on the tribological performance of brake friction materials. Design/methodology/approach In this study, brake friction materials were developed by using premixed dual metal sulfides as a replacement for antimony trisulfide in the formulation. The brake friction materials were developed in the form of standard brake pads as per the industrial practice. Thermal stability was measured for varying ingredients and developed brake pads using thermogravimetric analysis. The physical, mechanical and thermal properties of the developed brake pads were tested as per the industrial standards. The tribological properties were analyzed using the Chase test as per SAE J661. Worn surface analysis was done using a scanning electron microscope. Findings The experimental results indicate that the brake pads filled with premixed dual metal sulfides had good thermal stability, physical, chemical and mechanical properties with stable friction and less wear rate due to better lubrication preventing friction undulations. Originality/value This paper explains the influence of premixed dual metal sulfides as a replacement for antimony trisulfide in brake pads formulation to enhance the tribological performance by preventing friction undulations. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-04-2020-0144/

Comparative study of different solid lubricants towards friction stability in a non-asbestos disc brake pad

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Baskara Sethupathi P. ◽  
Chandradass J.
Keyword(s):  
Wear Resistance ◽  
Testing Machine ◽  
Synergetic Effect ◽  
Solid Lubricants ◽  
Metal Sulfides ◽  
Disc Brake ◽  
Mechanical And Thermal Properties ◽  
Brake Pad ◽  
Content Type ◽  
Brake Pads

Purpose This study aims to compare the influence of different solid lubricants on the friction stability of a non-asbestos disc brake pad. Design/methodology/approach Three brake pads were developed using three lubricants, namely, non-asbestos brake pad with sulfide mix (NASM), non-asbestos brake pad with bismuth sulfide (NABS) and non-asbestos brake pad with molybdenum disulfide (NAMO). Sulfide mix was indigenously developed by physically mixing friction modifiers, alkaline earth chemicals and various metallic sulfides homogeneously dispersed in graphite medium. The physical, chemical, mechanical and thermal properties of brake pads were characterized as per industrial standards. The tribological performances were studied using the Chase testing machine as SAE-J661-2012. The worn surface of the pads was studied using scanning electron microscope to analyze the dominating wear mechanism. Findings NASM was excellent in fade as well as wear resistance. NABS was better from a wear point of view, but fade resistance was moderate despite its higher cost. NAMO fared average in fade and wear despite its excellent dry lubricating properties. NASM was excellent in terms of fade as well as wear resistance. Originality/value Among the selected metal sulfides, the indigenously developed sulfide mix was better than the other two sulfides, which indicates that the synergetic effect of metal sulfides was always preferable to the individual sulfides.

Multi-metal sulfide pre-blend combination on the tribological performance of the brake friction material

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Sathickbasha K. ◽  
Selvakumar A.S. ◽  
Surya Rajan Balachandran ◽  
Hariharasakthisudhan P.
Keyword(s):  
Peer Review ◽  
Test Procedure ◽  
Metal Sulfide ◽  
Solid Lubricants ◽  
Tribological Performance ◽  
Maximum Temperature ◽  
Brake Pad ◽  
Wear Performance ◽  
Content Type ◽  
Brake Pads

Purpose The purpose of this study is the influence of various combinations of metal sulfides on the tribological performance of brake pads. Design/methodology/approach Three brake pads were prepared using the possible combination of any two of the solid lubricants from Bismuth trisulfide (Bi2S3); Tin disulfide (SnS2) and Antimony trisulfide (Sb2S3) are chosen and blended with molybdenum disulfide and graphite. The tribological performance was compared with the brake pad containing aftermarket sulfide mixture. The tribological performance parameters such as performance coefficient of friction, fade percent, recovery percent, wear thickness loss, time is taken to reach the maximum temperature and fluctuation of friction were investigated using Chase tribometer adopting IS 2742 Part-4 (1994) test procedure. Findings The friction stability of the brake pad with 4Wt% of MoS2, Bi2S3 and SnS2 was observed to be better, but it showed poor wear performance and aggressive towards the rotor, whereas the brake pad contained 4Wt% of MoS2, Bi2S3 and Sb2S3 exhibited improved wear performance. Originality/value This paper explains the influence of the combination of multiple metal sulfide in the tribological performance of the copper-free brake friction composite. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-07-2020-0249/

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.

Influence of iron–aluminum alloy on the tribological performance of non-asbestos brake friction materials – a solution for copper replacement

2019 ◽  
Vol 72 (1) ◽  
pp. 66-78 ◽  
Author(s):  
Saikrishnan G. ◽  
Jayakumari L.S. ◽  
Vijay R. ◽  
Lenin Singaravelu D.
Keyword(s):  
Aluminum Alloy ◽  
Tribological Performance ◽  
Mechanical And Thermal Properties ◽  
Initial Speed ◽  
Content Type ◽  
Aluminum Powders ◽  
Brake Pads ◽  
Iron Aluminum ◽  
Brake Dynamometer ◽  
Industrial Standards

Purpose The purpose of this study is to investigate the influence of commercially available iron–aluminum alloy compared to copper, iron and aluminum powders on the tribological performances of friction composites. The main objective is to replace copper from the friction composite formulations. Design/methodology/approach In this study, friction composites were fabricated as of standard brake pads using commercially available iron–aluminum alloy and compared to copper powder, iron powder and aluminum powder-based without varying the other ingredients. The brake pads were developed as per the industrial procedure. The physical, mechanical and thermal properties of the developed brake pads were analyzed as per industrial standards. Tribological properties were analyzed using the chase test. Initial speed and deceleration tests in a real-time braking scenario were performed using a full-scale inertia brake dynamometer. Worn surface analysis was done using a scanning electron microscope. Findings The results indicate that iron–aluminum alloy (mechanomade)-based friction composites possess good physical, chemical, thermal and mechanical properties with stable fade and recovery characteristics due to its composition and flake morphology. During initial speed and deceleration braking conditions, iron–aluminum alloy also showed good tribological behavior. Originality/value This paper explains the influence of commercially available iron–aluminum alloy in friction composites in enhancing tribological performance by its composition and flake morphology, which could potentially replace copper in friction composites by solving subsequent problems.

Synthesis and characterization of alicyclic two-component waterborne polyurethane

2018 ◽  
Vol 47 (4) ◽  
pp. 315-322 ◽  
Author(s):  
Jizhi Zhang ◽  
Xiankai Jiang
Keyword(s):  
Thermal Stability ◽  
Water Resistance ◽  
Aqueous Dispersion ◽  
Waterborne Polyurethane ◽  
Molar Ratio ◽  
Mechanical And Thermal Properties ◽  
Content Type ◽  
Two Component ◽  
Practical Implications

Purpose The purpose of this paper is to synthesize and characterize a series of alicyclic two-component waterborne polyurethane (2K-WPU) which is composed of non-ionic polyisocyanate aqueous dispersion and hydroxyl aqueous dispersion. Design/methodology/approach The appearances of aqueous dispersions and 2K-WPU films were observed by photographs. The micromorphology of alicyclic polyisocyanate aqueous dispersion was examined by scanning electron microscopy (SEM). The molecule structures of WPU were studied by Fourier transform infrared (FTIR). The effect of NCO:OH molar ratio of two components and trimethylolpropane (TMP) content on the thermal stability, mechanical and water resistance properties of 2K-WPU films was studied. Findings It was found by SEM that alicyclic polyisocyanate particles in aqueous dispersion showed a kind of spherical particle appearance, in which hydrophobic polyisocyanate was encapsulated by hydrophilic ether linkages segment. FTIR showed that WPU was polymerized through mixture of polyisocyanate component and hydroxyl component and increasing NCO:OH molar ratio of two components from 1.1:1 to 1.5:1 had increased the content of urea, urethane and allophanate of 2K-WPU films. Increasing NCO:OH molar ratio had improved the mechanical and thermal properties of the 2K-WPU film, but the water resistance of the 2K-WPU film increased first and then weakened. Increasing TMP contents from 1 to 0.75 mol for 1:5 system had improved the mechanical, thermal and water resistance properties of the 2K-WPU film. Practical implications The investigation established a method to prepare alicyclic 2K-WPU which is composed of non-ionic polyisocyanate aqueous dispersion and hydroxyl aqueous dispersion. The prepared 2K-WPU film could be applied in the field of waterborne surface coating, e.g. textile, wood and synthetic leather surfaces (Hasan et al., 2017; Akindoyo et al., 2016). Originality/value The paper established a method to synthesize alicyclic two-component 2K-WPU. The effect of NCO:OH molar ratio and TMP content on the thermal stability, mechanical and water resistance properties of 2K-WPU films were studied.

scholarly journals Influence of Solid Lubricants on the Tribological Performance of Photocurable Resins for Vat Photopolymerization

Lubricants ◽  
2020 ◽  
Vol 8 (12) ◽  
pp. 104
Author(s):  
Janez Slapnik ◽  
Tanja Stiller ◽  
Thomas Wilhelm ◽  
Andreas Hausberger
Keyword(s):  
Power Transmission ◽  
Charpy Impact ◽  
Solid Lubricants ◽  
Tensile Tests ◽  
Mechanical Analysis ◽  
Tribological Performance ◽  
Urethane Acrylate ◽  
Mechanical And Thermal Properties ◽  
Digital Light Processing ◽  
3D Printed

New developments in additive manufacturing (AM) are enabling the use of 3D printed parts in increasingly demanding applications, such as in mechanical power transmission systems, where excellent build quality and tribological performance are required. The tribological properties of thermoplastic-based AM technologies are well knowninject, whereas the performance of photopolymer-based AM technologies is very rarely explored. This study aims to provide new insight into the tribological performance of 3D printed parts produced using vat photopolymerization (VPP). Photocurable resins based on aliphatic urethane acrylate oligomers were modified with different solid lubricants (polytetrafluoroethylene (PTFE), graphite and molybdenum disulfide (MoS2)) and 3D printed using Digital Light Processing (DLP). The mechanical and thermal properties were studied using the tensile tests, Charpy impact tests, Shore D, and dynamic mechanical analysis (DMA). The tribological performance was studied using a Pin-on-Disk tribometer. Among the lubricants, PTFE had the highest impact on the coefficient of friction (µ) and the specific wear rate (ws). The hybrid lubricant system (PTFE/MoS2) resulted in excellent tribological performance, where the µ was reduced by up to 52% and ws by up to 92%.

scholarly journals Tribological Performance and Thermal Stability of Nanorubber-Modified Polybenzoxazine Composites for Non-Asbestos Friction Materials

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2435
Author(s):  
Chanchira Jubsilp ◽  
Jakkrit Jantaramaha ◽  
Phattarin Mora ◽  
Sarawut Rimdusit
Keyword(s):  
Thermal Stability ◽  
Tribological Performance ◽  
Mechanical And Thermal Properties ◽  
Butadiene Rubber ◽  
Friction Modifiers ◽  
Friction Materials ◽  
Wear Rates ◽  
Degradation Temperature ◽  
Viscoelastic Behaviors ◽  
Thermal Stability Of

Asbestos-free friction composite based on ultrafine full-vulcanized acrylonitrile butadiene rubber particles (UFNBRPs)-modified polybenzoxazine was successfully developed. The UFNBRPs-modified polybenzoxazine friction composite was characterized for chemical, tribological, and mechanical properties as well as thermal stability. The UFNBRPs not only act as a filler to reduce noise in the friction composites due to their suitable viscoelastic behaviors but also play a key role in friction modifiers to enhance friction coefficient and wear resistance in the polybenzoxazine composites. The chemical bonding formation between UFNBRPs and polybenzoxazine can significantly improve friction, mechanical, and thermal properties of the friction composite. The outstanding tribological performance of the friction composite under 100–350 °C, i.e., friction coefficients and wear rates in a range of 0.36–0.43 and 0.13 × 10−4–0.29 × 10−4 mm3/Nm, respectively, was achieved. The high flexural strength and modulus of the friction composite, i.e., 61 MPa and 6.4 GPa, respectively, were obtained. The friction composite also showed high thermal stability, such as 410 °C for degradation temperature and 215 °C for glass transition temperature. The results indicated that the obtained UFNBRPs-modified polybenzoxazine friction composite meets the industrial standard of brake linings and pads for automobiles; therefore, the UFNBRPs-modified polybenzoxazine friction composite can effectively be used as a replacement for asbestos-based friction materials.

Tribological behavior of hybrid PTFE/Kevlar fabric composites with different weave densities

2016 ◽  
Vol 68 (2) ◽  
pp. 278-286 ◽  
Author(s):  
HuLin Li ◽  
Zhongwei Yin ◽  
Dan Jiang ◽  
YongJin Li
Keyword(s):  
Tribological Behavior ◽  
Three Dimensional ◽  
Bearing Steel ◽  
Tribological Performance ◽  
Elemental Content ◽  
Wear Volume ◽  
Dry Sliding ◽  
Content Type ◽  
Transfer Films ◽  
Fabric Composites

Purpose – The purpose of this paper is to achieve attractive fabric composites with excellent tribological performance and investigate the wear mechanisms of these fabric composites sliding against bearing steel pins under dry sliding process. Design/methodology/approach – Five different weave density composites were prepared, and the tribological behaviors of these composites were studied at different testing conditions. Scanning electron microscopy, laser microscopy (three-dimensional profile measurements) and energy-dispersive X-ray spectrometry were used to analyze the worn surface morphology, wear volume and elemental content of the transfer films, respectively. Findings – The composite weave density serves an important influence on tribological behavior. Generally, the wear rate of each composite increased with increasing weave density, and the friction coefficient of each composite decreased with increasing weave density. Originality/value – Nanoparticle-filled hybrid polytetrafluoroethylene/Kevlar fabric composites with proper weave density have exhibited superior tribological properties in dry sliding conditions. The results that obtained in this paper may offer a reference for others who intend to achieve attractive fabric composites with excellent tribological performance.

Synergistic effect of Steel Slag-Molybdenum disulfide particles on fade-recovery performances of non-asbestos organic friction material

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Sundarrajan D. ◽  
Pitchipoo Pandian ◽  
Manoharan Sembian
Keyword(s):  
Synergistic Effect ◽  
Peer Review ◽  
Molybdenum Disulfide ◽  
Steel Slag ◽  
Friction Material ◽  
Mechanical And Thermal Properties ◽  
Friction Materials ◽  
Content Type ◽  
Brake Pads ◽  
Industrial Standards

Purpose This paper aims to deal with the synergistic effect of steel slag-molybdenum disulfide particles on fade-recovery performances of non-asbestos organic friction material. Design/methodology/approach The brake friction materials were developed by using steel slag and molybdenum disulfide particles as individual and combination in the formulation. The brake friction materials were developed in the form of standard brake pads as per the 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 the Chase test as per IS2742-Part-4. Worn surface analysis was done using a scanning electron microscope. Findings The experimental results indicate that the brake pads filled with a combination of steel slag and molybdenum disulfide showed stable friction and less wear rate due to the synergetic nature of abrasive and lubricant. Originality/value This paper explains the influence of steel slag and molybdenum disulfide particles as individual and combined in brake pads formulation to enhance the tribological performance by producing stabilized friction with undulations. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-06-2020-0216/

Sign in / Sign up

Export Citation Format

Share Document