Impact of post-curing duration on mechanical, thermal and tribological behavior of an organic friction material

Journal of Composite Materials

et al. 2020

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The arrangement of the constituents of organic-composite friction materials is a key factor of their microstructure and thermal and mechanical properties which can influence braking performance. Among these constituents, fibres can present complex morphologies and different arrangements depending on their type and the process of manufacturing. Besides, synergistic effects acting between these constituents and the resulting properties are still not well investigated. This work relates to rock- wool used for brake friction materials, and for which the process can lead to various arrangements. The focus is on synergies between these fibre arrangements and the other material constituents, in ways that reveals the link between the resulting microstructural characteristics and properties of organic composite materials. To achieve these objectives, two simplified formulations are elaborated with two distinct arrangements of rock wool fibres. The friction materials are investigated in terms of microstructure, thermo-physical and mechanical properties. It is found that fibre arrangements affect carbonaceous particle distribution, porosity, and fibre-matrix adhesion. On one side, homogeneous distribution and regular size of fibre bundles results in a better connectedness of conductive particles and thus enhances thermal conductivity. On the other side, a regular fibre bundles repartition lead to a more homogeneous distribution of strain localizations and a softer mechanical response.

Section: Link Between Microstructure and Thermo Physical And Mechanicmentioning

confidence: 95%

Section: Methodology: Materials Simplificationmentioning

confidence: 99%

Synergistic effects of fibre arrangements on the microstructure and properties of organic composite materials

Makni

Cristol

Journal of Composite Materials

et al. 2020

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“…Their formulation had a reduced number of constituents, derived from an industrial one. 17,18 This simplified formulation contained six constituents whose matrix was in phenolic resin binding mineral fibers and mineral and organic particles, as it was mentioned in Table 1.…”

Section: Experimental Work Investigated Materialsmentioning

confidence: 99%

Impact of hot molding temperature and duration on braking behavior of friction material

Hentati

Proceedings of the Institution of Mechanical Engineers, Part J:

Cristol

et al. 2019

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The manufacturing process of brake materials used for braking applications consists of a succession of steps among which the hot molding has a major impact on properties and performance of materials. In this paper, impact of hot molding temperature and duration on mechanical and thermal properties of friction materials developed with simplified formulation was investigated. Two different hot molding conditions were studied: condition 1 (low temperature associated to long duration) and condition 2 (high temperature associated to short duration). Braking behavior, thermo-mechanical phenomena and wear and friction mechanisms were also investigated. Results indicated that hot molding conditions did not significantly affect mechanical properties and tribological behavior, but they had impact on thermal properties (material molded according to condition 1, material A presented a higher thermal conductivity) and on wear mechanisms involved in the contact. In addition, results revealed that the studied hot molding conditions impacted thermal localization recorded during braking that was denser for the disc rubbed against material B (material molded according to condition 2).

“…This variability of the formulation complicates the understanding of tribological behavior and the role of each component [8]. Indeed, because of the influence of ingredients on the friction and wear mechanisms [9,10], it is crucial to understand the link between the development of friction materials and braking performance [11]. To overcome the complexity of industrial formulations which is an obstacle to the analysis of the role of the components in the braking, the study is carried out with simplified formulations composed of a reduced number of constituents.…”

Section: Introductionmentioning

confidence: 99%

Impact of brass contents on thermal, friction and wear properties of brake linings composites

Sellami

Kuş

et al. 2018

Mechanics & Industry

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Automotive brake lining materials are composite materials of very complex formulation, highly heterogeneous. They help to carry out the desired combination of braking performance properties. Obviously, it requires that the friction material exhibits good complementarities and adequate combination of physico-chemical, thermal properties that act synergistically to provide the braking performance which should be adjusted by the addition of metallic fillers. The aim of this work is to study the role of one of the copper alloy particles, namely brass, on friction and wear. For this purpose, the experimental approach is based on the development of a simplified formulation. Three derived composites were developed in the laboratory by the addition 1.5 wt.%, 3 wt.% and 4.5 wt.% of brass. It is shown that addition of copper alloy particles increased thermal properties. Wear test results show that brass contributes to friction and wear mechanisms from a quantity introduced in the formulation equal to 4.5 wt.%. In fact, given its large size, it acts as primary plates serving as supports for the formation and expansion of plates necessary to enhance the stability of friction coefficient. Conversely, when adding an amount less than 4.5%, brass particles are generally all removed from the matrix implying a higher source flow of third-body wear.