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Laminated and functionally graded hydroxyapatite/yttria stabilized tetragonal zirconia composites fabricated by spark plasma sintering

Guo, Hongbo, Khor, Khiam A., Boey, Yin Chiang, & Miao, Xigeng (2003) Laminated and functionally graded hydroxyapatite/yttria stabilized tetragonal zirconia composites fabricated by spark plasma sintering. Biomaterials, 24(4), pp. 667-675.

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Abstract

Hydroxyapatite ceramics have been conventionally strengthened and toughened in the form of composites and coatings. New microstructural designs and processing methodologies are still needed for the improvement of the mechanical properties of hydroxyapatite based ceramics. This study was to prepare laminated and functionally graded hydroxyapatite (HA)/yttria stabilized tetragonal zirconia (Y-TZP) composites by the relatively new process of spark plasma sintering. The microstructure and the mechanical properties of the laminated and functionally graded composites were studied for possible orthopedic applications. It was found that the laminated and functionally graded HA/Y-TZP composites could be densified at 1200 degrees Celsius within 5 minutes by the spark plasma sintering process and the average HA grain size in the composite layers was reduced by half due to the well dispersed Y-TZP second phase. The HA phase in the composite layers was stable up to 1200 degrees Celsius and the Y-TZP second phase remained the tetragonal zirconia (t-ZrO2) phase after being processed at the highest temperature of 1250 degrees Celsius. The laminated and functionally graded HA/Y-TZP composites exhibited much improved mechanical properties compared with the pure HA ceramics; the bending strength of the composites reached about 200 MPa, the double of the strength of the pure HA ceramics.

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ID Code: 6783
Item Type: Journal Article
Keywords: Hydroxyapatite, Zirconia, Spark plasma sintering, Laminate, Functionally graded material, Composite
DOI: 10.1016/S0142-9612(02)00381-2
ISSN: 0142-9612
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200) > Composite and Hybrid Materials (091202)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > BIOMEDICAL ENGINEERING (090300) > Biomaterials (090301)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200) > Ceramics (091201)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2003 Elsevier
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 30 Mar 2007
Last Modified: 29 Feb 2012 23:28

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