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Open AccessArticle

PVB/PEG-Based Feedstocks for Injection Molding of Alumina Microreactor Components

Karlsruhe Institute of Technology–KIT, Institute for Applied Materials, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
Department of Microsystems Engineering-IMTEK, University of Freiburg, Georges-Koehler-Allee 102, 79110 Freiburg, Germany
Author to whom correspondence should be addressed.
Materials 2019, 12(8), 1219;
Received: 1 March 2019 / Revised: 24 March 2019 / Accepted: 25 March 2019 / Published: 14 April 2019
(This article belongs to the Section Manufacturing Processes and Systems)
The ceramic injection molding (CIM) process is a cost-effective powder-based near net shape manufacturing process for large-scale production of complex-shaped ceramic functional components. This paper presents the rheological analysis of environmentally friendly CIM feedstock formulations based on the binder components polyvinyl butyral (PVB) and polyethylene gycol (PEG). The prepared PVB/PEG-based alumina molding compounds were investigated with respect to their PVB:PEG ratios as well as to their powder filling degrees in the range between 50 and 64 vol.%. Corresponding viscosities and shear stresses were determined for increasing shear rates to show the effects of increased PEG content and solid loadings on them. Two single reactor components were injection molded and subsequently joined in their green state for fabrication of an alumina microreactor. The intended purpose of the alumina microreactors is their potential application as wear-resistant and hydrothermal stable multifunctional devices (µ-mixer, µ-reactor, µ-analyzer) for continuous hydrothermal synthesis (CHTS) of metal oxide nanoparticles in supercritical water (sc-H2O) as the reaction medium. View Full-Text
Keywords: ceramic injection molding; alumina feedstock; PVB-/PEG-based binder system ceramic injection molding; alumina feedstock; PVB-/PEG-based binder system
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Medesi, A.J.; Nötzel, D.; Hanemann, T. PVB/PEG-Based Feedstocks for Injection Molding of Alumina Microreactor Components. Materials 2019, 12, 1219.

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