Impact of high energy ball milling on the nanostructure of magnetite–graphite and magnetite–graphite–molybdenum disulphide blends

Österle, Werner; Orts-Gil, Guillermo; Groß, Th.; Deutsch, Clemens; Hinrichs, Ruth; Vasconcellos, M.A.Z.; Zoz, H.; Yiğit, Deniz; Sun, Xiao‐Guang

doi:10.1016/j.matchar.2013.09.007

Cited by 18 publications

(7 citation statements)

References 33 publications

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“…Similar RSresults were obtained previously after ball milling of magnetitegraphite blends [30], and at the surface of brake discs [31]. The higher G/D peak intensity ratio of the present study compared to the previous ones may be attributed to the presence of graphite nanoparticles revealed by high resolution imaging of stacks of graphene planes in the tribofilms produced by the hybrid nanocomposites, which also contained 8 vol% of well-crystallized graphite [4].…”

Section: Potential Of Rs For Wear Scar Characterizationsupporting

confidence: 90%

Exploring the potential of Raman spectroscopy for the identification of silicone oil residue and wear scar characterization for the assessment of tribofilm functionality

Österle

Giovannozzi

Gradt

et al. 2015

Tribology International

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Section: Potential Of Rs For Wear Scar Characterizationsupporting

confidence: 90%

Exploring the potential of Raman spectroscopy for the identification of silicone oil residue and wear scar characterization for the assessment of tribofilm functionality

Österle

Giovannozzi

Gradt

et al. 2015

Tribology International

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“…Theoretically, all ingredients of the pad formulation or their chemical reaction products should be homogeneously mixed on the nanometer scale, provided the original ingredients are prone to nanostructure formation by mechanical processes like severe shear deformation or impact during particle collisions. The latter can be checked by ball milling experiments, as proved by several papers [70,[79][80][81]. A special mechanism of nanostructure formation is tribooxidation of the cast iron disc providing the major constituent of the third body.…”

Section: Tga Ms Semmentioning

confidence: 94%

The Role of Solid Lubricants for Brake Friction Materials

Österle

Дмитриев

2016

Lubricants

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This review article comprises of three parts. Firstly, reports of brake manufacturers on the beneficial impact of solid lubricants for pad formulations are surveyed. Secondly, since tribofilms were identified to play a crucial role in friction stabilization and wear reduction, the knowledge about tribofilm structures formed during automotive braking was reviewed comprehensively. Finally, a model for simulating the sliding behavior of tribofilms is suggested and a review on modelling efforts with different model structures related to real tribofilms will be presented. Although the variety of friction composites involved in commercial brake systems is very broad, striking similarities were observed in respect to tribofilm nanostructures. Thus, a generalization of the tribofilm nanostructure is suggested and prerequisites for smooth sliding performance and minimal wear rates have been identified. A minimum of 13 vol % of soft inclusions embedded in an iron oxide based tribofilm is crucial for obtaining the desired properties. As long as the solid lubricants or their reaction products are softer than magnetite, the main constituent of the tribofilm, the model predicts smooth sliding and minimum wear.

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“…During the preparation of EGC, some phenolic resin particles and aramid pulp may enter into certain EG layers; the phenolic resin will flow along EG and gradually coat the other materials in the processes of hot pressing and curing, forming a relatively stable network structure compared to that of NGC. In the test process, the stripped NG flakes and gray iron interact on the contact surface, promoting the oxidation and cracking of the graphite layer along the iron interface in general [29,30]. The iron oxides enter the graphite interlayer and participate in the formation of the friction layer.…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

Comparative tribological behavior of friction composites containing natural graphite and expanded graphite

Jin

Zhou

et al. 2019

Friction

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In this study, expanded graphite and natural graphite were introduced into resin-based friction materials, and the tribological behavior of the composites was investigated. The tribo-performance of the two friction composites was evaluated using a constant speed friction tester. The results showed that the expanded graphite composite (EGC) displayed better lubricity in both the fading and the recovery processes. The wear rate of the EGC decreased by 22.43% more than that of the natural graphite composite (NGC). In the fading process, and the EGC enhanced the stability of the coefficient of friction. The recovery maintenance rate of the NGC was 4.66% higher than that of the EGC. It can be concluded that expanded graphite plays an important role in the formation of a stable contact plateau and can effectively reduce the wear.

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Impact of high energy ball milling on the nanostructure of magnetite–graphite and magnetite–graphite–molybdenum disulphide blends

Cited by 18 publications

References 33 publications

Exploring the potential of Raman spectroscopy for the identification of silicone oil residue and wear scar characterization for the assessment of tribofilm functionality

Exploring the potential of Raman spectroscopy for the identification of silicone oil residue and wear scar characterization for the assessment of tribofilm functionality

The Role of Solid Lubricants for Brake Friction Materials

Comparative tribological behavior of friction composites containing natural graphite and expanded graphite

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