About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Advanced Materials for Harsh Environments
|
| Presentation Title |
Conformal Environmental Barrier Coatings On Additive Manufactured Robust Alloys for Mitigation of Oxidation, Erosion, and Corrosion |
| Author(s) |
Xueyan Song, Yun Chen, Cesar-Octavio Romo-de-la-Cruz, Richard Oleksak, Casey Carney, Omer Dogan |
| On-Site Speaker (Planned) |
Xueyan Song |
| Abstract Scope |
Environmental barrier coatings for increasing the resistance of the alloy towards oxidation and carburization are one of the critical challenges faced by power generation systems such as supercritical CO2 power cycles. In the present work, a conformal protective oxide coating layer has been simultaneously applied on both the internal and external surface of the Additive-manufactured heat exchangers using atomic layer deposition (ALD). The ALD layer is conformal, uniform, pin-hole-free, and dense. Under CO2 exposure at 650°C for 1500 hours, ALD-coated stainless steel 316 presents negligible weight gain. For Ni-based alloys of IN-625, after CO2 exposure at 750°C for 2500 hours, the ALD coating layer remains conformal and uniform. Meanwhile, the ALD coating effectively blocked the Cr outward diffusion. The nano-structure origin of the thermally stable ALD coating layer applied on the metal substrate and a new category of multifunctional environmental barrier coatings enabled by ALD will be discussed. |