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Sintering Behaviour of Multilayer Hydroxyapatite Laminates

E. Hahn, J. Hum, J. Will, K. Zuo, D. Jiang, P. Greil

Journal of Ceramic Science and Technology, Vol. 2, No. 1 (2011), pp. 61-68

DOI: 10.4416/JCST2010-00034

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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.

Keywords

Hydroxyapatite, laminate sintering, aggregated and dispersed powder

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