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Strategies for the selective volume sintering of ceramics

Published online by Cambridge University Press:  07 August 2014

Thomas Mühler ,
Gundula Helsch ,
Jürgen G. Heinrich ,
Dongxu Yao ,
Stephan Gräf ,
Frank A. Müller  and
Jens Günster
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: [email protected]
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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.

Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 17: Focus Issue: The Materials Science of Additive Manufacturing , 14 September 2014 , pp. 2095 - 2099
Copyright
Copyright © Materials Research Society 2014 

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References

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