Characterization of Brake Torque Variation of Wave Type Brake Disc for Motorcycles

Obunai, Kiyotaka; Okubo, Kimihiro; Fujii, Toru; Nakatsuji, Tsuyoshi

doi:10.4271/2009-01-3023

Cited by 2 publications

(1 citation statement)

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“…Previous studies revealed that when the environmental temperature is low, the coefficient of mutual friction of C/C composites is relatively low than that at high temperature (Yen et al, 1995(Yen et al, , 1996Gouider et al, 2004;Kasem et al, 2009). From the view point of reliable and safe performance, such dependence of frictional a coefficient on temperature should be cancelld for commercial vehicle application, in order to avoid the brake torque variation during braking (Obunai et al, 2006(Obunai et al, , 2009. In order to cancel the dependence of the frictional coefficient on temperature, metal infiltration methods have been applied to C/C composites (e.g., C/C-SiC and C/C-Al) (Krenkel et al, 2002;Wang et al, 2006;Stadler et al, 2007;Zhang et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Synthesization of CNT on Surface of C/C Composites to Stabilize the Coefficient of Friction through a Wide Environmental Temperature Range

Obunai

Okubo²,

Fujii³

2012

JMSR

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Carbon nanotubes (CNTs) were synthesized on the surface of carbon-carbon (C/C) composites by the thermal chemical vapor deposition method. The coefficient of mutual friction between two flat specimens of both modified and unmodified C/C composites were measured at a constant rotational speed under constant applied pressure by using disc-type test apparatus. The effect of CNT synthesization on the mutual friction coefficient and its dependence on test temperature were discussed. Frictional coefficient was high and also stable when the CNTs were synthesized on the surface while the test temperature was changed. The morphology evaluation of the frictional surface after the test suggested that synthesization of CNTs on a frictional surface of a C/C composite was effective in changing the wear mode for stability of the coefficient of friction according to the change of environmental temperature

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