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| Abstract No.: |
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Scheduled at:
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Wednesday, May 11, 2016, Room 3H + 3I + 3J 5:00 PM
Arc Spraying & Laser Spraying
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| Title: |
Simultaneously spraying of different wires by twin wire arc spraying using adapted air-caps and shroud effect
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| Authors: |
Mohamed Abdulgader* / University of Dortmund, Germany
Wolfgang Tillmann/ Technical University of Dortmund, Germany
Diego Bezerra/ Technical University of Dortmund, Germany
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| Abstract: |
Surface engineering, particularly thermal spraying techniques, can combine the positive properties of several basis elements in a tailored coating or even give new not inherent properties like e.g. super-elasticity. Twin wire arc spraying (TWAS) stands out as a coating technique due to its low investment cost, low running cost and the effortlessness as well as onsite use of the spraying apparatus. The feedstock in TWAS is introduced into the arc in form of two consumable arc electrodes wires . The in-flight particles from the individual wires will normally not mix properly with each other in the way that a desired composition can be produced. Provide a sufficient probability for the in-flight particles from the different wires to collide improves the mixing of compounds and thus enhances the controlling over the desired coating composition. In this work different air-cap attachments as well as shroud designs are studied to reveal their effect on the microstructure of coatings produced by spraying different materials simultaneously. Also the effect of polarity was revealed regards the microstructure and the distribution of the splats of the individual wires. The shroud principal shows a better compound mixing and denser microstructure compared to the modified secondary atomization air-caps.
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