About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Bulk Metallic Glasses XVII
|
Presentation Title |
Thin Film Metallic Glass Broad-spectrum Mirror Coatings |
Author(s) |
Tatiana Ștefanov, Harsha Vardhan R. Maraka, Wim Sillekens, David J. Browne |
On-Site Speaker (Planned) |
David J. Browne |
Abstract Scope |
The potential of metallic glasses for applications as optical mirrors for space was investigated. Various alloy compositions were developed using the rule of mixtures, in which the property of interest was the reflectivity of the pure components across a range of wavelengths from UV to near-IR. Composition choice was limited by the available method of synthesis by electric arc melting. After a preliminary study where the reflectivity of different bulk alloys was measured in the visible range, Al82.32Ni4.64Y0.04Zr13 and Zr56.6Cu29.6Al6.4Ag7.4 alloys were selected as targets for physical vapor deposition (PVD). Thin film metallic glasses were produced by PVD via magnetron sputtering on silicon carbide substrates. The structure, roughness, and hardness of the films were investigated. The predicted reflection was compared with the measured values for wavelengths between 250 nm and 2000 nm. The Al-based alloys were better optical reflectors, but the Zr-based ones were harder and offer higher thermal stability. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |