Functional fillers enhance the frictional performances of automotive brake friction materials (BFM). The influence of Calcium sulfate whiskers (CaSO4) in BFM's and its effect as a functional filler on the tribological performances were investigated. Four compositions containing all essential ingredients of BFMs were developed, varying the amount of CaSO4 whiskers (5%, 10% and 15%) and one composition without CaSO4 whiskers. The tribological studies were carried out on an inertia brake dynamometer as per JASO C 406 standard. Addition of CaSO4 whiskers was found to improve the mechanical properties of BFM composites. The inclusion of CaSO4 whiskers enhanced the frictional performance during fade. Surface analysis of the worn pads was carried out to understand the wear mechanism using scanning electron microscope. The friction materials with the inclusion of calcium sulfate whiskers experienced lesser wear. The composite with 10 wt% of CaSO4 whiskers exhibited the most stable friction coefficient even at high sliding speeds. © 2019 Karabuk University

Darius Gnanaraj S

Department of Design and Automation

School of Mechanical Engineering

Vellore Campus

Sudhan Raj J

Christy T.V

Sugozu B.

Fulltext

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Engineering Science and Technology, an International Journal

Binder provides structural integrity by holding all ingredients in the composition of a brake friction material. The modified binders have played a major role in improving the frictional performance and thermal resistance of the friction material. The present research work evaluates the influence of secondary binders (Nitrile Butadiene rubber (NBR) and Styrene Butadiene rubber (SBR)) on the tribological performance of the friction material using a full-scale inertia brake dynamometer as per JASO C406 standard. Three brake pads were developed by varying the type and composition of secondary rubber binder (5%NBR, 5%SBR and 2.5%NBR + 2.5%SBR) with rest of the ingredients kept unaltered. It was found that the quantity of SBR rubber powder present as secondary binder improved dry and wet recovery. Friction coefficient (μ) exhibited better stability during the fade with the inclusion of both the rubber powders. The friction material with the inclusion of both the NBR and SBR rubber powders exhibited overall better performance than compared to the inclusion of only one secondary binder rubber in the composition. The worn-out surface of the developed friction materials and the counter discs were characterised using FESEM. © 2018 Institute of Materials, Minerals and Mining and Informa UK Limited, trading as Taylor &amp; Francis Group.

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Journal	Data powered by TypesetEngineering Science and Technology, an International Journal
Publisher	Data powered by TypesetElsevier BV
ISSN	2215-0986
Open Access	Yes