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4162 |
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Wednesday, May 21, 2014, Hall H1 & H2 4:15 PM "Young Professionals" |
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Transfer of micro-structures by transplantation of thermal sprayed coatings |
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Patrick Knödler* / Institute of Materials Science
University of Hannover, Germany Achim Peuker / University of Dortmund, Dennis Freiburg/ University of Dortmund, Maik Otten/ University of Hannover, Kai Möhwald/ University of Hannover, Dirk Biermann/ University of Dortmund, |
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An increasing trend in manufacturing is, replacing parts of machinery with components made from lighter or cheaper materials, which often cant withstand the surface stress without additional measures. A widely used solution is the application of a coating to protect the surface from wear and corrosion. A common method for combined protection is thermal spraying, a process that in the conventional process chain invariable necessitates a finishing process for every workpiece. Another approach to thermal spraying allows, not only the omitting of the finishing steps, but also the creation of structured coatings without additional steps. In the transplantation process the coating is integrated into a high-pressure die casting process. In contrast to the conventional process chain, the coating is not directly applied to the workpiece, but to a mold insert. During the pressure casting the melt infiltrates the coating and thus creates a joint. This way the coating is indirectly applied to the die-cast workpiece after removal from the mold. Additionally, depending on the materials involved, a material bonding connection similar to brazing is possible and results in an increased adhesion of the coating.A potentially very interesting trait of the transplantation process is, turning an internal coating process into an external coating process. This allows the coating of inside diameters well below the usual limit of an internal spray gun. |