Process characterization and analysis of ceramic powder bed fusion
| Autor: | Bianca Maria Colosimo, Fabrizio Verga, Marco Grasso, Giorgio Viganò, Kevin Florio, Thomas Graule, Dario Puccio, Stefan Pfeiffer, Konrad Wegener |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Ceramics
Materials science Additive manufacturing Alumina Oxide 02 engineering and technology 01 natural sciences Industrial and Manufacturing Engineering law.invention chemistry.chemical_compound law 0103 physical sciences Powder bed fusion Ceramic Laser power scaling Composite material Selective laser melting 010302 applied physics Dopant Mechanical Engineering Absorptance measurements Integrating sphere 021001 nanoscience & nanotechnology Laser Computer Science Applications chemistry Control and Systems Engineering visual_art Absorptance visual_art.visual_art_medium High-speed vision 0210 nano-technology Software |
| Zdroj: | The International Journal of Advanced Manufacturing Technology, 117 (7) |
| ISSN: | 0268-3768 1433-3015 |
| DOI: | 10.3929/ethz-b-000500549 |
| Popis: | Powder bed fusion (PBF) of ceramics is often limited because of the low absorptance of ceramic powders and lack of process understanding. These challenges have been addressed through a co-development of customized ceramic powders and laser process capabilities. The starting powder is made of a mix of pure alumina powder and alumina granules, to which a metal oxide dopant is added to increase absorptance. The performance of different granules and process parameters depends on a large number of influencing factors. In this study, two methods for characterizing and analyzing the PBF process are presented and used to assess which dopant is the most suitable for the process. The first method allows one to analyze the absorptance of the laser during the melting of a single track using an integrating sphere. The second one relies on in-situ video imaging using a high-speed camera and an external laser illumination. The absorption behavior of the laser power during the melting of both single tracks and full layers is proven to be a non-linear and extremely dynamic process. While for a single track, the manganese oxide doped powder delivers higher and more stable absorptance. When a full layer is analyzed, iron oxide-doped powder is leading to higher absorptance and a larger melt pool. Both dopants allow the generation of a stable melt-pool, which would be impossible with granules made of pure alumina. In addition, the present study sheds light on several phenomena related to powder and melt-pool dynamics, such as the change of melt-pool shape and dimension over time and powder denudation effects. The International Journal of Advanced Manufacturing Technology, 117 (7) ISSN:0268-3768 ISSN:1433-3015 |
| Databáze: | OpenAIRE |
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