| About this Abstract |
| Meeting |
Materials Science & Technology 2019
|
| Symposium
|
Sandphobic Thermal/Environmental Barrier Coatings
|
| Presentation Title |
CMAS Removal by Spectrally Guided Laser Ablation |
| Author(s) |
Eric H. Jordan, Michael Renfro |
| On-Site Speaker (Planned) |
Eric H. Jordan |
| Abstract Scope |
CMAS accumulates over a period of time leading to thermal barrier coating failure after sufficient accumulation has occurred. CMAS accumulation can also block cooling holes. CMAS phobic coatings are one potential approach to this problem. In this presentation, an alternative approach is presented in which the CMAS is ablated from the TBC surface using a pulsed laser and spectral analysis of the radiation from the plasma during ablation is used to terminate the laser before significantly removing the underlying coating. The availability of low cost powerful and high-speed lasers has expanded the potential use of this method to full scale cleaning of hot parts. Laser ablation is also, in principle, capable of clearing cooling holes within line of sight limits. Periodic CMAS removal has the potential to greatly extend life especially on coatings that have a low tendency to chemically interact with CMAS. This aspect will also be discussed |