Characterization of a short carbon fiber reinforced new modified bismaleimide composite with special reference to bearing application

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Characterization of a short carbon fiber reinforced new modified bismaleimide composite with special reference to bearing application

 

Author: Gu, Chin
Title: Characterization of a short carbon fiber reinforced new modified bismaleimide composite with special reference to bearing application
Degree: M.Sc.
Year: 2000
Subject: Fiber reinforced plastics
Fibrous composites
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Applied Physics
Pages: vii, 89 leaves : ill. (some col.) ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1505779
URI: http://theses.lib.polyu.edu.hk/handle/200/3572
Abstract: The application of polymer-based composite as bearing material had been discussed and developed sixty years ago, but self-lubricating composite bearings were rapidly expanding just recently. The major dry sliding bearings are based on thermoplastic polymer composites -e.g. PTFE composites, Nylon 66 composites and PEEK composites, or based on thermosetting polymer composites -e.g. Phenolic composites. However, all four types of bearing materials have their drawbacks. PTFE and PEEK composites have higher wear rate and poor high-temperature properties, and Phenolic and Nylon 66 composites have higher coefficient of friction. This thesis studies the thermal, mechanical and chemical properties of a new bismaleimide composite in dry sliding bearing application and reports the results of various characteristics of this composite. This bismaleimide composite is reinforced with short carbon fibers and graphite. Compared with the above four types of bearing materials, it has excellent properties of thermal conductivity (弇=6.14W/m C at room temperature) and glass transition temperature (Tg=262 C), and better wear and friction properties: such as low friction coefficient (弮=0.10) and low specific wear rate (Ws=0.6x10-15 m3/Nm for block and 1.6x10-15 m3/Nm for ring). For mechanical strength, it also has good characteristics, the bending stress is over 100MPa and the bending modulus is over 12GPa. These results show that the fillers/reinforcements lead to greatly improved sliding wear behavior, stiffness and strength behavior, thermal stability, heat diffusion, and heat resistance behavior. In the meantime, the experimental results also shows that this new carbon fiber reinforced MBMI composite has very good combined characteristics when compared with other polymer-based composites. The fracture surfaces of specimens after bending and shearing testing and worn surfaces are studied with a SEM to give a greater insight into the flexural, shear, and wear mechanisms respectively.

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