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| Abstract No.: |
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Scheduled at:
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Wednesday, May 05, 2010, Olivia Room 12:20 PM
Properties 2
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| Title: |
Graded twin wire arc sprayed coatings
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| Authors: |
Mohamed Abdulgader / University of Dortmund, Germany
Wolfgang Tillmann* / TU-Dortmund / Institute of Materials Engineering , Germany
Evelina Vogli/ TU-Dortmund / Institute of Materials Engineering , Germany
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| Abstract: |
Functionally graded coatings, in which the composition and properties vary gradually from the bond layer to the top layer, are gaining more industrial acceptance due to the optimal utilization of the used material. Twin wire arc spraying (TWAS) is one of the most economical ways to produce protective coatings. This work aims to articulate the needed coating performances of TWAS sprayed coatings, by adapting the layers deposited, regarding to their position. In such coating, the adhesion is improved at the intersection between coating and substrate. Mean while at the top layers, it is more important to enhance other performances such as wear resistance. Using a new focusing and mixing nozzle, graded coating is generated to improve the required properties of the different layers. Starting with a base layer of massive metallic wires to improve adhesion to the substrate, powder of hard material is gradually added to the massive metallic wires to deposit a wear protective top layer. The graded coatings were then characterized in terms of bonding strength and wear resistance and compared to the coatings sprayed by means of massive and cored wires.
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