Strategies for the selective volume sintering of ceramics

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作者
Thomas Mühler
Gundula Helsch
Jürgen G. Heinrich
Dongxu Yao
Stephan Gräf
Frank A. Müller
Jens Günster
机构
[1] Clausthal University of Technology,Institute of Nonmetallic Materials
[2] Chinese Academy of Sciences,State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics
[3] Friedrich-Schiller University of Jena,Otto
[4] BAM Federal Institute of Materials Research and Testing,Schott Institute of Materials Research
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摘要
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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页码:2095 / 2099
页数:4
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