About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Advanced Functional and Structural Thin Films and Coatings & Honorary Palkowski Session
|
Presentation Title |
Alloying Refractory Diboride Thin Films as a Route to Nanocrystallinity |
Author(s) |
Samyukta Shrivastav, Dana Yun, Kinsey Canova, John R. Abelson, Jessica A. Krogstad |
On-Site Speaker (Planned) |
Jessica A. Krogstad |
Abstract Scope |
Hafnium diboride can be deposited as a continuous, conformal amorphous thin film via low temperature chemical vapor deposition (CVD). However, substantiative shrinkage accompanies any excursions to elevated temperatures as a result of crystallization. The ensuing crack formation and spallation negates most functional properties of the refractory coatings. In the present study, we have leveraged the same low temperature CVD methods to fabricated alloyed hafnium diboride films, wherein the degree of crystallinity of as-deposited films increases with increasing concentration of the alloying element. We report on the thermal stability of this nanocrystalline microstructure as well as its impact on the mechanical properties and environmental tolerance of the films. The low temperature, environmentally benign CVD process, when combined with the uniquely nanocrystalline microstructure of the resulting films makes this a highly promising avenue for tailoring the properties of next generation, high performance tool coatings. |
Proceedings Inclusion? |
Planned: |
Keywords |
Thin Films and Interfaces, Nanotechnology, Ceramics |