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4821 |
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Thursday, May 12, 2016, Yellow River Hall 11:00 AM Power Generation III |
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Comparison of suspension plasma sprayed TBCs produced with different types of injection |
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Robert Vaßen* / Forschungszentrum Jülich GmbH, Germany Dapeng Zhang/ Forschungszentrum Jülich GmbH, IEK-1, Germany Nadin Schlegel/ Forschungszentrum Jülich GmbH, IEK-1, Germany Georg Mauer/ Forschungszentrum Jülich GmbH, IEK-1, Germany Daniel Emil Mack/ Forschungszentrum Jülich GmbH, IEK-1, Germany |
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Suspension plasma spraying can be used to produce different types of thermal barrier coatings (TBCs) as the process shows a high flexibility with respect to microstructure. By this technique highly porous, segmented and columnar coatings can be prepared. Examples of such microstructures and their performance will be given especially for the case of radial injection. It turned out that thermal cyclic performance is in certain cases limited. As a possible reason only partly molten particles in the outer regions of the plume are assumed. By plasma spraying with radial injection of the suspension it turned out that these features are difficult to avoid. One possible solution is the use of an axial injection which is expected to largely improve the efficiency of the injection process especially for suspension plasma spraying. First results of SPS TBCs sprayed by an axial feeding system will be presented and compared to coatings made by radial injection. Special focus will be laid on the performance in thermal cyclic rigs. |