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Investigation of the Role of Fiber Reinforcement on the Performance of Rubber Based Friction Material

Arjmand, Mohammad | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39513 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Shojaei, Akbar
  7. Abstract:
  8. Friction composites, as a part of vehicle safety system, should hold some characteristics such as high wear resistance, low weight, durability, low noise, stable friction coefficient, availability and low price. It is very interested to use mixture of rubber and resin in friction materials to reach good properties of both rubber and resin simultaneously. This mixture is especially used in railway’s brake pads. Fibrous reinforcement is another important ingredient in friction composites. Asbestos used to be the most significant fibrous reinforcement due to its appropriate tribological specifications but the recent ban on asbestos by environmental protection agency has forced the friction industry to seek out versatile fiber which can replace asbestos in performance and not pose health hazards. In this study, the influence of fibrous einforcement, viz. steel wool, carbon fiber, aramid pulp and cellulsoe fiber is investigated. In the tested composites, increasing the sliding velocity led to propagation of two opposed parameters, viscoelastic response and friction-induced heat. The superiority of each of these two parameters affected the tribological specifications considerably. Steel wool resulted in cohesion mechanism, friction coefficient propagation and low wear resistance at high sliding velocities. Carbon fiber led to high wear resistance and low friction coefficient due to outstanding tribological qualifications and layer structure. Aramid pulp showed high coefficient of friction and good wear resistance because of formation of sticky contact patches on the friction surface. Cellulose fiber confronted to thermal degradation at low temperatures and produced abrasive wear debris; therefore, it showed high coefficient of friction and wear rate. SEM analysis of the worn surfaces proved to be useful in correlating wear of the composites to the topographical changes on the surfaces
  9. Keywords:
  10. Carbon Fibers ; Lignocellulosic Fibers ; Aramid Fiber ; Frictional Material ; Viscoelastic Response ; Fade Phenomenon ; Steel Wool

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