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

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

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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.

Original languageEnglish
Pages (from-to)2009-2012
Number of pages4
JournalJournal of Materials Research
Volume18
Issue number9
Publication statusPublished - 2003 Sep 1
Externally publishedYes

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ASJC Scopus subject areas

  • Materials Science(all)

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