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7422 |
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Wednesday, May 04, 2022, Hall -2.32/33 11:10 AM Pre- & Post-Treatment |
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Stripping of thermal sprayed oxid coatings by means of laser techniques, water jet and a newly developed hybrid methods
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Maik Staschik / Technische Universität Berlin/ Surface Coating Institute, Germany Yves Kuche / Fraunhofer Institute for Production Systems and Design Technology, Germany Christian Rupprecht*/ Technische Universität Berlin, Germany Eckart Uhlmann/ Fraunhofer Institute for Production Systems and Design Technology, Germany Marie-Luise Röhricht/ Siemens Energy AG/ Coating and Repair of turbine blades, Germany |
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Many industrial applications require efficient stripping methods for thermal spray coatings, especially when cost-intensive substrate materials are utilized. A typical example are turbine components with thermal barrier coatings (plasma-sprayed YSZ) in combination with nickel-based bond coats, like rotor blades which are maintainanced more than 5 times in the turbine industrie. Unfortunately the conventional stripping methods are dirty (contermination with grid blasting material), environmentally harmful (aggressive fluids, strong acid) or relativally uneffective (high tool load in mechanical milling). In ordner to avoid these disadvantages alternative techniques such as removal by laser, water jet stripping and hybrid methods such as ultrasonic-based mechanical methods and a combination of water-, laser- and cryo-techniques have been investigated. In this paper newly developed stripping methods are compared to classic techniques. The evaluation considers user-friendlyness and technological performance under the aspects of substrat-interaction, material emission and economic considerations. |