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Friction and wear performance of functionally graded ductile iron for brake pads
ID Polajnar, Marko (Author), ID Kalin, Mitjan (Author), ID Thorbjornsson, Ingólfur (Author), ID Thorgrimsson, Jon Thor (Author), ID Valle, Nathalie (Author), ID Botor-Probierz, Agnieszka (Author)

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Abstract
Due to its wear resistance, functionally graded ductile iron (FGDI) is a potential material for automotive brake pads. In this investigation it was studied (i) under well controlled sliding conditions in a typical tribological model-test to show in detail the mechanism behind improved wear resistance, namely the "property on-demand" functionality in the sub-surface zone and (ii) in a validation experiment on a disc-brake machine that mimic realistic brake-contact conditions, at various elevated temperatures against a carbon-reinforced ceramic disc in order to understand its tribological behaviour in a real automotive brake application. The results revealed a positive e ff ect of the functional gradient zone (FGZ) on the wear performance of the functionally graded ductile- iron pads. Most notably, improved wear resistance was observed under sliding model-test conditions as well as a more-stable wear and wear that is less sensitive to the contact temperature during a disc-brake test. In addition, the sliding model-tests revealed that FGZ leads to faster running in and a more stable coe ffi cient of friction. The disc-brake tests also show that FGZ ensures a relatively constant coe ffi cient of friction for all contact temperatures. Surface analysis of the pads further revealed that oxidized, smoothened plateaus containing graphite nodules were formed on the pads. On the other hand, a patchy and layered transfer fi lm resulting from the pads was formed on the disc's surface.

Language:English
Keywords:wear, friction, brake pads, ductile iron
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Publication status:Published
Publication version:Author Accepted Manuscript
Year:2017
Number of pages:Str. 85-94
Numbering:Vol. 382-383
PID:20.500.12556/RUL-106733 This link opens in a new window
UDC:621.892:620.3(045)
ISSN on article:0043-1648
DOI:10.1016/j.wear.2017.04.015 This link opens in a new window
COBISS.SI-ID:15500059 This link opens in a new window
Publication date in RUL:14.03.2019
Views:1119
Downloads:407
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Record is a part of a journal

Title:Wear
Shortened title:Wear
Publisher:Elsevier
ISSN:0043-1648
COBISS.SI-ID:5374213 This link opens in a new window

Secondary language

Language:Slovenian
Keywords:obraba, trenje, zavorne ploščice, duktilno železo

Projects

Funder:ARRS - Slovenian Research Agency
Project number:P2-0231
Name:Tribologija

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