Laser beam melting of alumina : effect of absorber additions
| Autor: | Jean-Dominique Bartout, Marie-Hélène Berger, Karim Terki, Christophe Colin, Liliana Moniz |
|---|---|
| Přispěvatelé: | Centre des Matériaux (MAT), MINES ParisTech - École nationale supérieure des mines de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
General Engineering 02 engineering and technology Molar absorptivity 021001 nanoscience & nanotechnology Wavelength 020303 mechanical engineering & transports 0203 mechanical engineering visual_art Attenuation coefficient visual_art.visual_art_medium [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] Particle General Materials Science Ceramic Composite material 0210 nano-technology Porosity Laser beams Shrinkage |
| Zdroj: | JOM Journal of the Minerals, Metals and Materials Society JOM Journal of the Minerals, Metals and Materials Society, Springer Verlag (Germany), 2018, 70 (3), pp.328-335. ⟨10.1007/s11837-017-2716-9⟩ |
| ISSN: | 1047-4838 |
| DOI: | 10.1007/s11837-017-2716-9⟩ |
| Popis: | International audience; Ceramic laser beam melting offers new manufacturing possibilities for complex refractory structures. Poor absorptivity in near infra-red wavelengths of oxide ceramics is overcome with absorber addition to ceramic powders. Absorbers affect powder bed densities and geometrical stability of melted tracks. Optimum absorber content is defined for Al2O3 by minimizing powder bed porosity, maximizing melting pool geometrical stability and limiting shrinkage. Widest stability fields are obtained with addition of 0.1 wt.% C and 0.5 wt.% β-SiC. Absorption coefficient values of Beer-Lambert law follow stability trends: they increase with C additions, whereas with β-SiC, a maximum is reached for 0.5 wt.%. Powder particle ejections are also identified. Compared to metallic materials, this ejection phenomenon can no longer be neglected when establishing a three-dimensional manufacturing strategy. |
| Databáze: | OpenAIRE |
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