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An Investigation of Alumina Nanoparticles Role on the Performance of Automotive Brake Friction Materials

Etemadi Mehrenjani, Habib | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43912 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Shojaei, Akbar
  7. Abstract:
  8. The research on the automotive brake composite materials is very extensive due to its complex formulation and the used of diverse variety of materials. While various research activities has been applied in this research group, but there are many unknown areas. This subject with the arrival of new materials, especially nanometer materials, has received increasing attention. In this study, the effect of alumina nanoparticles on the performance of automotive brake friction materials were examined. Generally, alumina (as micro particles) used as the abrasive material for many years in the formulation of composite brake pads. But, the effect of alumina on the nanometer scale hasn't been examined yet exactly. Since phenolic resin widely used as a binder of friction materials, therefore, it will try to firstly the processing method of nanoalumina with phenolic resin by solution mixing method (loading at 2.5, 5, 10, and 20 wt%) examined, and finally the effect of nanoalumina will study on the wear and friction properties of automotive brake friction materials. In the second part, using phenolic resin processed with nanoalumina and based on the reference formulation of friction materials, various samples which containing different types and percentages (optimum wt% of nanoalumina in the phenolic/alumina nanocomposite, 2, and 4 vol%) of the particles are produced and their properties were studied. To examine the dispersion of nanoparticles in the phenolic resin, samples were prepared by other way, i.e. direct mixing method. The results showed that at low concentration of nanoalumina, below 5 wt%, the extent of enhancement in tensile and flexural strength are 37% and 17%, respectively. While at high loading of nanoalumina, due to agglomeration of nanoparticles, tensile and flexural strength decreased. Also, the sample with containing 5 wt% of nanoalumina, has the highest value in the glass transition temperature, which this increase was equivalent to 4.4% with respect to pure resin. The obtained results from tribological properties of friction materials showed that the sample with containing 4 vol% of nanoalumina, has the highest recovery percent (15 % increase), lowest fade percent (30 % decrease), and lowest interface temperature (6.5 % decrease) with respect to reference sample
  9. Keywords:
  10. Phenolic Resin ; Nanocomposite ; Solution Mixing ; Mechanical Properties ; Frictional Material ; Brake Pad ; Alumina Nanoparticles

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