A number of brake lining materials representative of original equipment in US, Japanese and European automobiles were characterized in order to determine their composition and microstructure. Their frictional performance was subsequently determined using the Friction Assessment and Screening Test (FAST machine). The goal of this work was to identify each constituent of the friction material, to deduce their individual role in the friction process and to determine the effect of the microstructure on the wear properties. By comparing the behavior of hybrid brake linings observed during FAST, the following conclusions can be made: The lowest wear was detected in specimens with the higher content of aramid fibers in the structure. This finding is in a good correlation with data published in literature. Aramid fibers and their properties are responsible for good wear resistance. The highest wear was observed in specimens containing higher amount of glassy phase. The reason is the flaking out of abrasive glassy phase particulates and the heterogeneity of glassy phase distribution. The specimens with the highest content of glassy fibers revealed the most unstable friction coefficient. Specimens containing no glassy fibers and/or with glassy fiber content lower than 10 % tend to swell during testing. The thermal diffusivity of swelling specimens is low. Environmentally friendly cellulose plays a positive role in wear protection when properly combined with aramid fiber and glassy phase even if temperature is higher than 350 Grad C. Wear resistance is not simply proportional to the hardness of composite brake lining materials.
Automotive Brake lining characterization
Charakterisierung von Fahrzeugbremsbelägen
1997
17 Seiten, 23 Bilder, 9 Tabellen, 21 Quellen
Conference paper
English
Automotive Brake Lining Characterization
British Library Conference Proceedings | 1997
|Automotive Brake Lining Characterization
SAE Technical Papers | 1997
|Automotive brake lining characterization
Automotive engineering | 1997
|Automotive brake lining materials
Engineering Index Backfile | 1950
|Automotive Brake Lining Materials
SAE Technical Papers | 1950
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