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Sintering Behaviour of Multilayer Hydroxyapatite Laminates
E. Hahn1, J. Hum1, J. Will1, K. Zuo2, D. Jiang2, P. Greil1
1 University of Erlangen-Nuremberg, Department of Materials Science (Glass and Ceramics) Martensstr. 5, D-91058 Erlangen, Germany
2 Shanghai Institute of Ceramics, Chinese Academy of Sciences, The State Key Lab of High Performance Ceramics and Superfine Structures, 1295 Ding-Xi Rd, Shanghai 200050, China
received September 2, 2010, received in revised form October 20, 2010, accepted October 21, 2010
Vol. 2, No. 1, Pages 61-68 DOI: 10.4416/JCST2010-00034
Abstract
Aqueous tape-cast slurries of hydroxyapatite with a solid loading of 32 vol% were prepared from various fractions of aggregated (mean particle size 4.7 – 5.6 μm) and dispersed powder (mean particle size 0.17 – 0.29 μm). Multilayer laminates were prepared and the shrinkage and density of the laminates sintered at 1250 °C were measured. While fractional density in the green laminates remains almost constant at 0.52, a pronounced increase in fractional sintered density from 0.96 to > 0.99 was observed with decreasing fraction of aggregated powder. Residual pore size and pore number density were reduced from 0.58 μm to 0.48 μm and 0.049 pores/μm2 to 0.019 pores/μm2, respectively. The multilayer laminates attained a mean bending strength of 118 ± 10 MPa measured with the bi-axial bending test. An osteosynthesis plate design was fabricated for demonstration of the potential of sintered multilayer laminates.
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Keywords
Hydroxyapatite, laminate sintering, aggregated and dispersed powder
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© 2010 Göller Verlag
Acknowledgments
The authors gratefully acknowledge the financial support from the German Research Foundation (GR 961/28-1).