| Popis: |
The use of thermal barrier coatings (TBCs) has been an important factor in the efficiency improvements of jet engines due to their ability to withstand the extreme environments within the engine. With this improved resistance, TBCs have also become more difficult to remove without damaging the substrate. Mound Laser & Photonics Center, Inc. (MLPC) has developed an innovative, laser based technique to spall this coating. The intention of this work was to investigate and better understand the removal mechanism. Through experimentation and analysis (such as high speed video, Scanning Electron Microscopy and Energy Dispersive Spectroscopy, semi-logarithmic analysis, and a numerical thermal model) information supportive of a two stage thermal and rapid vaporization based mechanism has been obtained. The method and analysis presented in this work helps to expand the understanding of thermal and rapid vaporization spallation techniques as well as guide MLPC in optimization of their process. |
