Rolling wear of EPDM and SBR rubbers as a function of carbon black contents: correlation with microhardness |
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Authors: | D Xu J Karger-Kocsis A K Schlarb |
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Affiliation: | 1.Institut für Verbundwerkstoffe GmbH (Institute for Composite Materials),Kaiserslautern University of Technology,Kaiserslautern,Germany |
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Abstract: | The rolling friction and wear of ethylene/propylene/diene (EPDM) and styrene/butadiene rubbers (SBR) with different carbon
black (CB) contents were studied against steel in orbital rolling ball (steel)-on-plate (rubber) test rig (Orbital-RBOP) and
oscillating rolling ball (steel)-on-plate (rubber) set-up (Oscillating-RBOP). The universal hardness (H), coefficient of friction (COF), and specific wear rate (W
s) of EPDM and SBR were determined. Incorporation of CB increases the universal hardness and the COF (the latter marginally)
and decreases the specific wear rate for both EPDM and SBR. The wear mechanisms were concluded by inspecting the worn surfaces
in scanning electron microscope and discussed as a function of CB modification. An inverse relationship between the specific
wear rate and universal hardness was proposed in form of W
s = kH
−n
, where k and n are constants for a given rubber and testing condition. |
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Keywords: | |
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