| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing and Innovative Powder Processing of Functional and Magnetic Materials
|
| Presentation Title |
Improved Near-infrared Absorption for Additive Manufacturing Feedstock Using Reduced Graphene Oxide |
| Author(s) |
Chu Lun Alex Leung, Iuliia Elizarova, Mark Isaacs, Shashidhara Marathee, Eduardo Saiz, Peter D. Lee |
| On-Site Speaker (Planned) |
Chu Lun Alex Leung |
| Abstract Scope |
Additive Manufacturing (AM) makes components with complex geometry and unique design features, layer-by-layer. However, there are limited choices of commercial powders for AM, partly constrained by the laser absorbance, an area that is not well investigated. Carbon additives are commonly used to promote near infra-red (NIR) absorbance of the powders but their efficiency is low. Here, we combine synchrotron X-ray imaging with chemical characterisation techniques to explain the role of additives on NIR absorption, evolution mechanisms of melt track and defects during AM. We employ a reduced graphene oxide (rGO) additive that enables AM of low NIR absorbance powders, e.g. fused silica. The rGO increases the powder’s NIR absorbance 3 times greater than conventional carbon additives and enables printing of SiO2. This study reports a method to widen the palette of materials for laser based AM machines to process all classes of materials, unlocking their true potential. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Ceramics, Powder Materials |