Relationship between microstructure and mechanical properties of fibrous HAp -(t -ZrO2 ) /Al2O3-(m -ZrO2) composites

The microstructure and mechanical properties of core/shell, fibrous HAp-(t-ZrO2)/Al2O3-(m-ZrO2) composites, which were fabricated by the multi-pass extrusion process, were investigated depending on the sintering temperature. In the composite sintered at 1200 deg C, many pores were observed in both H...

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Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2007-06, Vol.458 (1-2), p.11-16
Main Authors: LEE, Byong-Taek, LEE, Chi-Woo, YOUN, Min-Ho, SONG, Ho-Yeon
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Fatigue, brittleness, fracture, and cracks
Materials science
Materials synthesis
materials processing
Mechanical and acoustical properties of condensed matter
Mechanical properties of solids
Physics
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Summary:The microstructure and mechanical properties of core/shell, fibrous HAp-(t-ZrO2)/Al2O3-(m-ZrO2) composites, which were fabricated by the multi-pass extrusion process, were investigated depending on the sintering temperature. In the composite sintered at 1200 deg C, many pores were observed in both HAp-(t-ZrO2) core and Al2O3-(m-ZrO2) shell regions. However, at 1500 deg C, the shell regions showed dense and anisotropic grain growth and the core region were transformed to alpha-TCP and beta-TCP phase. Also, as a minor reaction phase, the CaAl12O19 peaks detected. The values of relative density, hardness, bending strength and fracture toughness increased as the sintering temperature increased, and their maximum values were at 1500 deg C about 890Hv, 280MPa and 4.1MPam1/2, respectively. The fracture morphology was appeared with homogeneously rough surface, and indentation cracks showed short length due to the crack deflection and microcracking toughening mechanisms.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2006.11.155