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

Obunai, Kiyotaka; Okubo, Kimihiro; Fujii, Toru

doi:10.5539/jmsr.v2n1p15

Cited by 2 publications

(1 citation statement)

References 16 publications

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“…coefficient was depended on the temperature condition around the frictional surface with an un-ignorable level. People who intend to utilize may well know that the frictional coefficient is low at low temperature, whereas high frictional coefficient is obtained at elevated temperature on the surfaces of C/C composites [5], [6]. For practical application to commercial vehicles, stabilization of the frictional coefficient of C/C composites has been required because frictional surface would be exposed under variable conditions of temperature.…”

Section: Introductionmentioning

confidence: 99%

Moderation in Temperature Dependence of Counter Frictional Coefficient and Prevention of Wear of C/C composites by Synthesizing SiC on Surface and internal Vacancies

Wakamoto¹,

Obunai

Okubo³

et al. 2017

The Proceedings of Conference of Kansai Branch

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The aim of this study is to moderate the dependence of counter frictional coefficient on temperature between counter surfaces and to reduce the wear of C/C composites at low temperature. To modify the C/C composites, Silica (SiO 2) powders were added into phenolic resin for carbon precursor. The preform plate of the precursor of C/C composites was prepared by conventional filament winding method. The C/C composites plates were obtained by carbonizing preform plate at 2200 °C under an argon atmosphere. At that time, the silicon carbides (SiC) were synthesized around the surfaces and the internal vacancies of the C/C composites. The frictional coefficient on the counter surfaces and specific wear volumes of the C/C composites were measured by our developed frictional test machine like pin-on disk type. The XRD indicated that SiC was synthesized in the body of C/C composite fabricated by current method. The results of friction test showed that coefficient of friction of unmodified C/C composites have temperature dependence when the test condition was changed. In contrast, frictional coefficient of the C/C composite modified with SiO 2 powders was almost constant at about 0.27 when the temperature condition was changed from Room Temperature (RT) to 300 °C. The specific wear rate decreased from 25×10-6 mm 2 /N to 0.1×10-6 mm 2 /N.

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Section: Introductionmentioning

confidence: 99%

Moderation in Temperature Dependence of Counter Frictional Coefficient and Prevention of Wear of C/C composites by Synthesizing SiC on Surface and internal Vacancies

Wakamoto¹,

Obunai

Okubo³

et al. 2017

The Proceedings of Conference of Kansai Branch

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Synthesization of CNTs on Pore Surfaces in C/C Composites and Effect of CNTs on Tribological Characteristics

Obunai¹,

Okubo²,

Fujii³

2014

J. Soc. Mat. Sci., Japan

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The purpose of this study is to stabilize the coefficient of friction of carbon-carbon (C/C) composites through wide environmental temperature range by synthesizing the carbon nanotubes (CNTs) on its surface and inner pore. In this study, conventional CFRP was carbonized at 2,200˚C with inert atmosphere to fabricate the C/C composites in which char matrix was made from phenolic resin. CNTs were synthesized on the surface and inner pore of fabricated C/C composites by the thermal chemical vapor deposition method. The coefficient of mutual friction and wear amount between two flat specimens were measured at a constant rotational speed under constant applied pressure by using the 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 surface and inner pore while the test temperature was changed. The wear amount of modified C/C composites was almost same as that of unmodified one. Test results also showed that the variation of friction coefficient of modified C/C composites during frication test was explained by the variation of local volume fraction of matrix of C/C composites.

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

Cited by 2 publications

References 16 publications

Moderation in Temperature Dependence of Counter Frictional Coefficient and Prevention of Wear of C/C composites by Synthesizing SiC on Surface and internal Vacancies

Moderation in Temperature Dependence of Counter Frictional Coefficient and Prevention of Wear of C/C composites by Synthesizing SiC on Surface and internal Vacancies

Synthesization of CNTs on Pore Surfaces in C/C Composites and Effect of CNTs on Tribological Characteristics

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