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Preparation of hydroxyapatite/α-tricalcium phosphate composites by colloidal process

✍ Scribed by H.Y. Yasuda; S. Mahara; T. Nishiyama; Y. Umakoshi

Publisher
Institute of Physics and National Institute of Materials Science
Year
2002
Tongue
English
Weight
171 KB
Volume
3
Category
Article
ISSN
1468-6996

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✦ Synopsis

Synthesised hydroxyapatite (HAp)/a-tricalcium phosphate (a-TCP) composites were prepared by colloidal process. Mixed slurries composed of 30 vol% HAp/a-TCP powder and 70 vol% aqueous solution containing a small amount of polymer dispersant were produced. HAp/a-TCP powder was blended with 0, 0.2, 0.4 or 1.0 mass fraction of a-TCP. Rheological behaviour of the HAp/a-TCP mixed slurries depended on the quantity of polymer dispersant and pH. Addition of suitable quantity of polymer dispersant at higher pH resulted in an increase in the stability of colloidal state due to electrostatic stabilisation. The optimum quantity of dispersant for the colloidal process was found to be proportional to the mass fraction of a-TCP. In the dehydration process of the slurries, pressure ®ltration technique was effective in preventing the gravity segregation of a-TCP. Thus, HAp/a-TCP composites with homogeneous microstructure and high relative density could be prepared by optimising the colloidal process.

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