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University of Barcelona

University of Barcelona




The University of Barcelona (UB) is Spain’s leading research university, publishing more research than any other Spanish institution with the exception of the Spanish National Research Council (CSIC).

The UB has 106 departments and more than 5,000 full-time researchers, technicians and research assistants, most of whom work in the UB’s 243 research groups as recognized and supported by the Generalitat de Catalunya. In 2010 the UB was awarded 175 national research grants and 17 European grants and participated in over 500 joint research projects with the business sector, generating an overall research income of 70 million euros.

The work of these groups is overseen by the UB’s research centres and institutes which collaborate with the leading research institutions and networks in Spain and abroad. The UB is also home to three large research foundations: the Barcelona Science Park Foundation (PCB), which includes the Institute of Biomedical Research (IRBB); the August Pi i Sunyer Biomedical Research Institute (IDIBAPS); and the Bellvitge Institute for Biomedical Research (IDIBELL).




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16 July 2021


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Ms. Gabriela Macías, Rimsa Metal Technology S.A, SPAIN

Dr. Carlos Lorenzana, Rimsa Metal Technology S.A, SPAIN

Prof. Dr. Javier Fernandez, University of Barcelona, SPAIN

Metal sulphides are additives that are used in brake pad formulations because they help to stabilize the coefficient of friction, reduce wear and improve NVH. Previous rimsa studies have shown that the oxidation mechanism of metal sulphides is one of the key properties that explain their contribution to performance and wear. Depending on the metal sulphide, the oxidation mechanism is different and so is the tribochemistry. Hence, the transfer layer formed will strongly depend on the metal sulphide used.

This work is focused on establishing a connection among the metal sulphide oxidation, the transfer layer formed and the performance. The friction behavior was determined through two tests, J2522 and J2707, using a NAO formula where only the metal sulphide was varied. While the transfer layer characterization was carried out through pad SEM-EDS cross-section analysis, after each test.

The differences in thermal profile of J2522 and J2707 illustrate the correlation between performance and wear and different oxidation mechanisms depending on the metal sulphide used. SEM characterization of pad surface also shows that the transfer layer morphology varies depending on the metal sulphide used in the formulation. Hence, the results of this research indicate that the morphology of the transfer layer and the friction behaviour strongly depend on the oxidation mechanism of the metal sulphide.

EuroBrake 2021




Determination of the Influence of Metal Sulphides on the Tribofilm and the Friction Behavior, EB2021-FBR-003, EuroBrake 2021

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