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1209 |
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Wednesday, June 04, 2008, Room 08 10:00 AM Pre- and Post-Treatment Thermal sprayed coatings must be regarded as part of a production process, in order to produce superior quality and performance new possibilities in pre- and post-treatment have to be discussed |
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Improving wear and corrosion of magnesium alloys through a combination of thermal spraying and laser cladding |
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Tim Biermann* / Chair for Laser Technology
RWTH Aachen University, Germany Dr. Andreas Weisheit/ Fraunhofer Institute for Laser Technology, Germany Kirsten Bobzin/ Surface Engineering Institute, RWTH Aachen University, Germany Jochen Zwick/ Surface Engineering Institute, RWTH Aachen University, Germany Felix Ernst/ Surface Engineering Institute, RWTH Aachen University, Germany Katharina Richardt/ Surface Engineering Institute, RWTH Aachen University, Germany |
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Saving energy is a major concern in every aspect of the economy, especially in the automotive and aerospace industry. The use of lightweight materials is one way to reduce weight of moving parts and thus energy consumption. Magnesium and its alloys provide many suitable properties like a high strength-to-weight ratio, a density that is only two-thirds that of aluminum, high damping characteristics and good machinability. But there are also some undesirable properties, especially poor corrosion and wear resistance. Thermal spraying technology is a suitable method for covering components with protective coatings. However, thermal-sprayed coating can suffer from porosity and poor bonding dependent on the substrate material. Research activities to improve the porosity on the one hand, and the coating properties like wear and corrosion resistance on the other hand, show the potential of a hybrid coating process. The creation of thermal-sprayed coatings and a laser post-treatment enable a minimization of porosity and an improvement of wear properties. Different coating materials (e.g. AlSi alloys) have been investigated regarding microstructure, hardness, wear- and corrosion protection. |