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Fabrication and compressive strength of macrochannelled tetragonal zirconia polycrystals with calcium phosphate coating layer

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Abstract

Macrochannelled tetragonal zirconia polycrystals (TZP) coated with a calcium phosphate layer were fabricated using a coextrusion process to produce strong and bioactive porous bioceramics. The initial feedrod, composed of three materials [TZP (shell), calcium phosphate (intermediate layer), and carbon black (core)], was coextruded through a 750-μm orifice at 120 °C, producing a continuous and flexible filament. Each sheet, which was composed of a unidirectional array of filaments, was stacked and then warm-pressed at 140 °C with 10 MPa. After binder burnout, the green billet was sintered between 1350 and 1600 °C for 1 h in air, leaving uniform macrochannels clad on the inside with bioactive calcium phosphate on a strong TZP body. The compressive strength of the specimen was much higher than that of calcium phosphate with a similar structure.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Seoul National University, 151–742, Seoul, Korea

    Young-Hag Koh, Hae-Won Kim & Hyoun-Ee Kim

  2. Materials Science and Engineering Department, University of Michigan, Ann Arbor, 48109–2136, Michigan, USA

    John W. Halloran

Authors
  1. Young-Hag Koh
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  2. Hae-Won Kim
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  3. Hyoun-Ee Kim
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  4. John W. Halloran
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Koh, YH., Kim, HW., Kim, HE. et al. Fabrication and compressive strength of macrochannelled tetragonal zirconia polycrystals with calcium phosphate coating layer. Journal of Materials Research 18, 2009–2012 (2003). https://doi.org/10.1557/JMR.2003.0280

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  • DOI: https://doi.org/10.1557/JMR.2003.0280

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