Improving the braking performance of the novalac-based CNFs/carbon composite by the wet chemical oxidation of CNFs |
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| Affiliation: | 1. Shanghai Institute of Ceramics, Key Laboratory of Inorganic Functional Materials and Devices, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China;2. University of Chinese Academy of Sciences, Shijingshan District, Beijing 100049, China;3. Beijing Advanced Innovation Center for Materials Genome Engineering, and Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China;1. Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research (IEK), Materials Synthesis and Processing (IEK-1), Wilhelm-Johnen-Straße, 52428 Juelich, Germany;2. RWTH Aachen University, Institute of Mineral Engineering (GHI), Aachen, Germany;3. JARA-Energy, Juelich, Germany;1. State Key Laboratory for Mechanical Behavior of Materials & School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China;2. State Key Laboratory for Mechanical Behavior of Materials & School of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an 710049, China;3. Yixin Electronic Material Co., Ltd, Rizhao 272306, China;1. Laboratory for Computational Physics, Institute for Computational Science and Artificial Intelligence, Van Lang University, Ho Chi Minh City, VietNam;2. Faculty of Mechanical - Electrical and Computer Engineering, School of Technology, Van Lang University, Ho Chi Minh City, VietNam;3. Faculty of Engineering, Vietnamese-German University, Binh Duong, VietNam;4. International Training Institute for Materials Science, Hanoi University of Science and Technology, Ha Noi, VietNam |
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| Abstract: | In this research, the braking performance of the CNFs-carbon composite pads was improved by the oxidation of CNFs using wet chemical oxidation. Oxidation of CNFs resulted in the formation of functional groups on the CNFs that improved adhesion and bonding of the CNFs to the matrix. Through this process, the toughness, tensile, compressive, and bending strength of the composite were strongly increased. Also, the hardness and wearing properties of the composite were improved by the oxidation of CNFs. For the composite reinforced by the oxidized CNFs, the low content of the nanofiber pull-out increased the COF. The main disadvantage of the oxidized CNFs-carbon composite was the sample decomposition at temperatures above 400 °C. This feature can deteriorate the braking performance of the composite when it is pushed too hard and overheated. To fix this problem, a SiC coating layer was applied to the composite by CVD method. Applying SiC postponed the thermal degradation of the composite up to 1000 °C. Weight losing of the SiC-coated sample was recorded at about 3.13 % at 1000°C. |
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| Keywords: | Carbon composites CNFs Braking pads Wearing rate Toughness Wet chemical oxidation |
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