Volume 97, Issue 1 p. 32-34
Rapid Communication

Three-dimensional Ceramic/Camphene-based Coextrusion for Unidirectionally Macrochanneled Alumina Ceramics with Controlled Porous Walls

Young-Wook Moon

Young-Wook Moon

Department of Dental Laboratory Science and Engineering, Korea University, Seoul, 136-703 Korea

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Kwan-Ha Shin

Kwan-Ha Shin

Department of Dental Laboratory Science and Engineering, Korea University, Seoul, 136-703 Korea

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Young-Hag Koh

Corresponding Author

Young-Hag Koh

Department of Dental Laboratory Science and Engineering, Korea University, Seoul, 136-703 Korea

Department of Orthopaedics, Korea University Medical Center, Guro Hospital, Seoul, 152-703 Korea

Author to whom correspondence should be addressed. e-mail: [email protected]Search for more papers by this author
Hyun-Do Jung

Hyun-Do Jung

Department of Materials Science and Engineering, Seoul National University, Seoul, 151-742 Korea

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Hyoun-Ee Kim

Hyoun-Ee Kim

Department of Materials Science and Engineering, Seoul National University, Seoul, 151-742 Korea

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First published: 29 November 2013
Citations: 30

Abstract

We report the utility of three-dimensional ceramic/camphene-based coextrusion, newly developed in this study, for the production of unidirectionally macrochanneled alumina ceramics with three-dimensionally interconnected porous alumina walls. In this technique, a continuous ceramic/camphene filament with a diameter of 1 mm, comprised of a pure camphene core and a frozen alumina/camphene shell, was produced by the coextrusion process and then deposited in a layer-by-layer sequence using a computer-controlled 3-axis moving table. Unidirectionally aligned macrochannels (~400 μm in diameter) and three-dimensionally interconnected pores (several tens of micrometers in size) in the alumina walls were created by removing the camphene core and the camphene dendrites formed in the alumina/camphene region, respectively. The sample showed much higher compressive strength in the macrochannel direction than in the perpendicular direction. In addition, the compressive strength of the sample could increase with an increase in initial alumina content owing to a decrease in the total porosity.