Fabrication of macrochannelled-hydroxyapatite bioceramic by a coextrusion process

Young Hag Koh, Hae Won Kim, Hyoun Ee Kim, John W. Halloran

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43 Citations (Scopus)


A coextrusion process was used to fabricate macrochannelled hydroxyapatite (HA). To improve the powder characteristics, the HA powder was calcined at 900°C in air for 1 h. A feedrod composed of HA (shell) and carbon black (core) was coextruded at 120°C through a symmetric 8:1 square reduction die. After the first coextrusion, the individual pieces were bundled, warm-pressed, and then coextruded again. After removing the binder, the billet was sintered at 1350°C for Ih in air. Uniform, 27 vol% macrochannels with a diameter of 270 μm were formed in the dense HA through removal of the carbon black. The compressive strength of the test specimens was strongly dependent on the macrochannel direction due to the stress concentrations related to the macrochannel geometry.

Original languageEnglish
Pages (from-to)2578-2580
Number of pages3
JournalJournal of the American Ceramic Society
Issue number10
Publication statusPublished - 2002 Oct
Externally publishedYes

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


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