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2811 |
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Characteristics of aluminum alloy matrix B4C reinforced composite coatings deposited on a 6082 aluminum alloy by cold spray process |
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Onur Meydanoglu* / Istanbul Technical University
, Turkey Caner Sonmez / Istanbul Technical University, Turkey Murat Baydogan/ Istanbul Technical University, Turkey E. Sabri Kayali/ Istanbul Technical University, Turkey Huseyin Cimenoglu/ Istanbul Technical University, Turkey |
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Al alloy matrix B4C reinforced composite coatings were deposited on a 6082 Al alloy by cold spray process. Al-12Si, Al and B4C particles were dry-blended with certain amounts to produce the feedstock powders. Deposition of the feedstock powders was performed using air as an accelerating gas under an inlet pressure of 5 bar. Characterizations of the composite coatings were made by means of microstructural examinations, hardness measurements. Microstructures of the coatings were evaluated by microscopic surveys and X-ray diffraction analysis. Hardness measurements were conducted on a micro-hardness tester with a Vickers indenter under an indentation load of 0,05 kg. Wear tests were carried out by rubbing Al2O3 ball having a diameter of 6 mm to the coatings under a normal load of 1N. Wear tests were made in two different media ie under normal atmospheric conditions and in pure water. Addition of Al particles into the feedstock powder reduced the hardness of the coating, which remarkably increased upon addition of B4C particles. In accordance with the increase in hardness, presence of B4C particles in the coating resulted in an improvement in wear resistance. However, B4C particles more than 10 vol.% did not provide a further enhancement in the wear resistance. It is interesting to note that composite coatings exhibited higher wear resistance in water when compared to the normal atmospheric conditions. |