Influence of calcium sulfate whiskers on the tribological characteristics of automotive brake friction materials

Jeganmohan, Sudhanraj; Christy, T. V.; Solomon, Darius Gnanaraj; Sugözü, Banu

doi:10.1016/j.jestch.2019.06.007

Cited by 23 publications

(18 citation statements)

References 28 publications

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“…The contact plateaus on the structure surface display different grey scales because of the difference in the plateau heights. The horizontal scratches on the surface, as shown in Figure 4, indicate abrasion as a vital wear mechanism (Sudhan Raj et al , 2020). The compaction of the bismuth oxide with the wear debris forms more amounts of contact plateaus.…”

Section: Resultsmentioning

confidence: 99%

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

Sethupathi

Chandradass

2021

ILT

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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.

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Section: Resultsmentioning

confidence: 99%

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

Sethupathi

Chandradass

2021

ILT

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“…Calcium sulphate (CaSO 4 ) whiskers can be also used as fillers due to their highly ordered crystal structure, endowing CaSO 4 with high thermal stability.Less wear was detected using CaSO 4 whiskers as a functional filler and a composite, with 10% CaSO 4 whiskers displaying the most stable COF, even at high sliding speeds [105].…”

Section: Inorganic Fillermentioning

confidence: 95%

Ecological Transition in the Field of Brake Pad Manufacturing: An Overview of the Potential Green Constituents

Confiengo

Faga

2022

Sustainability

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Nowadays, the drive for green products has undergone a rapid increase following the global ecoawareness and the severe regulations aimed at preventing the environment from further damage. The use of ecosafe constituents in materials for harsh applications, such as brake pad systems, can be a possible solution for reducing health hazards arising from particle release during braking. Based on this, the present study provides a bibliographic review of green alternative constituents for friction material formulation, focusing the attention on their influence on the tribological properties of the final composites. The traditional materials still used in commercial brake pads are shortly described, with the aim to provide an overview of the current situation. In the final part of the review, following the trend of circular economy, works dealing with the use of waste as an ingredient of friction materials are also reported. The whole literature screening points out that much work is still required to obtain completely green friction materials. Indeed, few works dealing with the phenolic resin replacement, proposing inorganic ecosafe materials such as geopolymers, are present. On the contrary, the use of natural fibers is widely investigated: palm kernel, flax, agave and aloe can be identified as promising constituents based on the literature results and the generated patents.

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“…The high content of manganese plays a substitution role to form alloy cementite. Alloy cementite is beneficial to the formation and refinement of pearlite, and it can improve strength and hardness, and reduce plasticity [28]. By optimizing the ratio of ingredients and adjusting the chemical composition, the performance of brake disc can be improved.…”

Section: Alloy Processmentioning

confidence: 99%

“…Figure 13 shows the wear of the four materials under SEM, where (a) represents C0, (b) represents C1, (c) represents C2, and (d) represents C3. It can be seen that the addition of calcium sulfate whisker improves the wear of the material surface and increases the wear resistance of the material surface [28]. Therefore, the study of reducing or increasing friction of inorganic particles as a filler in composites has great significance to the development of composites.…”

Section: Composite Materials Technologymentioning

confidence: 99%

Comprehensive Analysis on the Performance and Material of Automobile Brake Discs

Yang

Wang

et al. 2020

Metals

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This article reviews the current status of automotive brake disc research and the prospects for future research. At present, the research of brake disc performance mainly includes thermal conductivity, thermal fatigue resistance, wear resistance, and brake noise. It is found that a new alloy composite, heat treatment process, ceramic composite, new structure, and new materials are emerging. At the same time, it was found that ceramic and resin were used as the matrix, fiber materials were used as reinforcements to prepare brake discs, the addition of new fillers and the study of special reinforcement materials have become new hotspots in the study of brake discs. In the future development, carbon-fiber ceramic brake discs may become the main research focus of brake discs.

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Influence of calcium sulfate whiskers on the tribological characteristics of automotive brake friction materials

Cited by 23 publications

References 28 publications

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

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

Ecological Transition in the Field of Brake Pad Manufacturing: An Overview of the Potential Green Constituents

Comprehensive Analysis on the Performance and Material of Automobile Brake Discs

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