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

Published online by Cambridge University Press:  31 January 2011

Young-Hag Koh ,
Hae-Won Kim ,
Hyoun-Ee Kim  and
John W. Halloran
Young-Hag Koh
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul, 151–742, Korea
Hae-Won Kim
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul, 151–742, Korea
Hyoun-Ee Kim
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul, 151–742, Korea
John W. Halloran
Affiliation:
Materials Science and Engineering Department, University of Michigan, Ann Arbor, Michigan, 48109–2136
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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.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 18 , Issue 9 , September 2003 , pp. 2009 - 2012
Copyright
Copyright © Materials Research Society 2003

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