Preprint Article Version 1 This version is not peer-reviewed

Selective Laser Sintering of Porous Silica Enabled by Carbon Additive

Version 1 : Received: 30 September 2017 / Approved: 1 October 2017 / Online: 1 October 2017 (06:20:03 CEST)

A peer-reviewed article of this Preprint also exists.

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

Journal reference: Materials 2017, 10, 1313
DOI: 10.3390/ma10111313

Abstract

The aim of this study was 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 yet fully achieved its 3D fabrication capabilities without using polymer binder. Except for the limitation of high melting point, brittleness and low thermal shock resistance from instinct ceramic material properties, the key hurdle lies on very poor absorptivity of oxide ceramics to fiber laser which is widely installed in the commercial SLS equipment. An alternative solution to overcome the poor laser absorptivity via improving material compositions was presented in this study. The positive effect of carbon additive on the absorptivity of silica powder to fiber laser will be discussed. To investigate the capabilities of the SLS process, 3D porous silica structures were successfully prepared and characterized.

Subject Areas

selective laser sintering (SLS); porous ceramic; carbon additive; laser absorptivity

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