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Materials 2017, 10(11), 1313;

Selective Laser Sintering of Porous Silica Enabled by Carbon Additive

State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China
Department of Mechanical Engineering and Centre for Additive Manufacturing, National University of Singapore (NUS), Singapore 117576, Singapore
Author to whom correspondence should be addressed.
Received: 30 September 2017 / Revised: 5 November 2017 / Accepted: 13 November 2017 / Published: 16 November 2017
(This article belongs to the Special Issue NextGen Materials for 3D Printing)
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The aim of this study is to investigate the possibility of a freeform fabrication of porous ceramic parts through selective laser sintering (SLS). SLS was proposed to manufacture ceramic green parts because this additive manufacturing technique can be used to fabricate three-dimensional objects directly without a mold, and the technique has the capability of generating porous ceramics with controlled porosity. However, ceramic printing has not yet fully achieved its 3D fabrication capabilities without using polymer binder. Except for the limitations of high melting point, brittleness, and low thermal shock resistance from ceramic material properties, the key obstacle lies in the very poor absorptivity of oxide ceramics to fiber laser, which is widely installed in commercial SLS equipment. An alternative solution to overcome the poor laser absorptivity via improving material compositions is presented in this study. The positive effect of carbon additive on the absorptivity of silica powder to fiber laser is discussed. To investigate the capabilities of the SLS process, 3D porous silica structures were successfully prepared and characterized. View Full-Text
Keywords: selective laser sintering (SLS); porous ceramic; carbon additive; laser absorptivity selective laser sintering (SLS); porous ceramic; carbon additive; laser absorptivity

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Chang, S.; Li, L.; Lu, L.; Fuh, J.Y.H. Selective Laser Sintering of Porous Silica Enabled by Carbon Additive. Materials 2017, 10, 1313.

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