الفهرس 
Chapter One: Literature ReviewOnly 14 pages are availabe for public view
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Abstract
The wear of polyvinyl chloride (PVC) and polyethylene (PE) filled with inorganic nanoparticles and inorganic nanofibers was studied. Aluminum oxide (Al2O3) nanofibers and nanoparticles were employed as fillers in PE coating and PVC coating for fabricating the tested composites. The reinforced PE coating and the reinforced PVC coating has been impregnated by oil. Steel specimens used as substrate coated by the tested composites and oil. The effect of the matrix on wear of surfaces subjected to abrasive contaminants is discussed. An abrasive wear tester was developed to simulate the abrasion caused by a sandy soil against surfaces subjected to abrasive contaminants. Motion was transmitted to the disc via the drill chuck. The test time was 15 min. Experiments were carried out at 25 °C. Wear was measured by digital balance with an accuracy of ± 0.001 g. Wear and embedment of sand particles were analyzed using optical microscopy after the test.
Based on the experimental results, it was found that, the addition of Al2O3 nanoparticles to the coating enhanced the wear resistance and the hardness of the matrix. The increase of oil content decreased the wear. Al2O3 nanofibers enhanced the wear resistance and the hardness of the coating. Where, the high adhesion for Al2O3 nanofibers increased the accordance between the polymer and the nanofibers and showed a considerable mitigation in the wear due to the high hardness of Al2O3. Increase of oil content enhanced the embedment of sand particles. Where, the oil decreased the hardness of the coating by increasing the plasticity of it. The high abrasive action of sand particles facilitates the embedment. So the sand particles embedded in the surface of the specimen and increased the abrasion resistance of the coating appreciably, by forming a protective wear layer of hard sand particles on the surface of coating.