Fabrication of Zirconia-Hydroxyapatite Composites for Biological Materials

Byung Kyu Moon; Dae Ho Choi; Rak Joo Sung; Seung Ho Kim; Koichi Niihara

doi:10.4028/www.scientific.net/MSF.486-487.101

Paper Titles

Sol-Gel Synthesis and Photocatalitic Properties of Bi₂MNbO₇ (M = Al, Fe, In y Sm)
p.85

Influence of Spraying Power and Distance on Porosity and Microhardness of Plasma Sprayed TiO₂ Coatings
p.89

Preparation of Nano-Sized TiO₂ Photocatalysts by a Multi-Gelation Method and Their Application to the Degradation of 2-Propanol Diluted in Water
p.93

High Temperature Oxidation Behavior of Ti₃SiC₂ in Air
p.97

Fabrication of Zirconia-Hydroxyapatite Composites for Biological Materials
p.101

Thermal and Leaching Behaviors of EAF Dust-Clay Systems
p.105

Increased High Temperature Oxidation Resistance of Ni20Cr20Fe5Nb1Y₂O₃ Alloy with Nano-Sized Grains
p.109

Changes in Mechanical Properties of the Wide-Gap Region Brazed with Various Brazing Temperatures and Times
p.113

Preparation of Porous Hydroxyapatite/TCP Composite Block Using a Hydrothermal Hot Pressing Method
p.117

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Fabrication of Zirconia-Hydroxyapatite Composites for Biological Materials

Abstract:

Microstructure and mechanical behaviors of zirconia [ZR; ZrO2+3mol%Y2O3]–nano hydroxyapatite [HA; Ca10(PO4)6(OH)2] nanocomposites were studied. A pulse electric current sintering (PECS) method was applied to fabricate ZR-HA composites as biomaterials. The reaction between zirconia and hydroxyapatite was successfully avoided. It was a successful preparation of bioactive composites in the quasi-binary system Ca10(PO4)6(OH)2 + ZrO2. One of the most serious problems is that when a mixture of zirconia and nano-hydroxyapatite powders was sintered, extensive chemical reaction between zirconia and hydroxyapatite was unavoidable. By applying a novel super-fast consolidation technique, pulse electric current sintering (PECS), the deleterious reactions were inhibited kinetically. The specimens contain 0, 10, 20, and 30wt% of hydroxyapatite on zirconia as remainder. Samples were sintered using the PECS method at 1100°C , 1150°C, 1200°C, and 1250°C, with increasing 100°C /min, under a pressure of 50Mpa in vacuum atmosphere for 5min. Characterization of the samples was carried out using X-ray diffraction analysis at different sintering temperatures. Flexural strength was estimated with 3-point bending test. The relative density was acquired using an Archimedes method in toluene medium.