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Strategies for the selective volume sintering of ceramics

Published online by Cambridge University Press:  07 August 2014

Thomas Mühler*
Affiliation:
Institute of Nonmetallic Materials, Clausthal University of Technology, Clausthal-Zellerfeld 38678, Germany
Gundula Helsch
Affiliation:
Institute of Nonmetallic Materials, Clausthal University of Technology, Clausthal-Zellerfeld 38678, Germany
Jürgen G. Heinrich
Affiliation:
Institute of Nonmetallic Materials, Clausthal University of Technology, Clausthal-Zellerfeld 38678, Germany
Dongxu Yao
Affiliation:
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
Stephan Gräf
Affiliation:
Otto-Schott Institute of Materials Research, Friedrich-Schiller University of Jena, Jena 07743, Gemany
Frank A. Müller
Affiliation:
Otto-Schott Institute of Materials Research, Friedrich-Schiller University of Jena, Jena 07743, Gemany
Jens Günster
Affiliation:
Institute of Nonmetallic Materials, Clausthal University of Technology, Clausthal-Zellerfeld 38678, Germany; and BAM Federal Institute of Materials Research and Testing, Division of Ceramic Processing and Biomaterials, 12205 Berlin, Germany
*
a)Address all correspondence to this author. e-mail: thomas.muehler@tu-clausthal.de
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Abstract

The present study is dealing with the basic physics for a novel way to generate a free-formed ceramic body, not like common layer by layer, but directly by Selective Volume Sintering (SVS) in a compact block of ceramic powder. To penetrate with laser light into the volume of a ceramic powder compact it is necessary to investigate the light scattering properties of ceramic powders. Compared with polymers and metals, ceramic materials are unique as they offer a wide optical window of transparency. The optical window typically ranges from below 0.3 up to 5 µm wave length. In the present study thin layers of quartz glass (SiO2) particles have been prepared. As a function of layer thickness and the particle size, transmission and reflection spectra in a wave length range between 0.5 and 2.5 µm have been recorded. Depending on the respective particle size and by choosing a proper relation between particle size and wave length of the incident laser radiation, it is found that light can penetrate a powder compact up to a depth of a few millimeters. With an adjustment of the light absorption properties of the compact the initiation of sintering in the volume of the compact is possible.

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Articles
Copyright
Copyright © Materials Research Society 2014 

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References

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