The heat resistance of three multiphase friction materials made with ST (straight phenolic resin), BP (B-P (boron-phosphorous)-modified phenolic resin), or PI (polyimide) was investigated by measuring the amount of fade during the constant interval test and the amount of wear at high temperatures using a Krauss-type friction tester. Thermal analysis of the cured resins was also carried out to examine the chemical and mechanical properties of the resin and their effects on the wear rate and the coefficient of friction. The results showed that the fade and wear of the friction materials were closely related to the thermal decomposition of the binder resin and durability of the contact plateaus, which were produced by the compaction of wear debris around hard ingredients on the rubbing surface. The fade resistance was improved by using the resins with high thermal decomposition temperatures. Friction materials with boron-phosphorus-modified resin maintained their contact plateaus, which helped to improve the friction stability at elevated temperatures, and were more resistant to wear and fade than the other binder resins. Boron-phosphorus-modified resin showed relatively small wear with good fade resistance at high temperatures compared to others. On the other hand, the friction material with polyimide showed good fade resistance but exhibited excessive wear despite its good thermal resistance. Excessive wear with large craters on the rubbing surface was observed in the friction materials containing polyimide due to low stiffness at high temperatures, despite the good fade resistance.


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    Title :

    Tribological characteristics of binder resins for brake friction materials at elevated temperatures


    Contributors:
    Shin, M.W. (author) / Cho, K.H. (author) / Lee, W.K. (author) / Jang, H. (author)

    Published in:

    Tribology Letters ; 38 , 2 ; 161-168


    Publication date :

    2010


    Size :

    8 Seiten, 9 Bilder, 3 Tabellen, 19 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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