Tribological properties of C/C-SiC composites for brake discs |
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Authors: | G H Jang K H Cho S B Park W G Lee U S Hong H Jang |
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Affiliation: | (1) Department of Materials Science and Engineering, Korea University, 1, 5-ga, Anam-dong, Seongbuk-gu, Seoul, 136-701, South Korea;(2) Materials Research Team, R&D Division, Hyundai-Kia Motors, Gyeonggi, 445-706, South Korea; |
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Abstract: | This study examines the friction and wear of ceramic matrix composites designed for use in automotive brake discs. The composites
are produced by reinforcing a SiC matrix with carbon fibers using a liquid silicon infiltration method. C/C-SiC composites
with two different compositions are fabricated to examine the compositional effect on the tribological properties. The tribological
properties are evaluated using a scale dynamometer with a low-steel type friction material. The results show that the coefficient
of friction is determined by the composition of the composite, which affects the propensity of friction film formation on
the disc surface. A stable friction film on the disc surface also improves the wear resistance by diminishing the abrasive
action of the disc. On the other hand, the friction film formation on the disc is affected by the applied pressure, and stable
films are obtained at high pressures. This trend is prominent with discs with high Si content. However, both C/C/-SiC composites
show superior performance in terms of the friction force oscillation, which is closely related to brake-induced vibration. |
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