Dispersion and Slip Casting of Hydroxyapatite

Ramachandra Rao, R and Thandali Kannan, S (2001) Dispersion and Slip Casting of Hydroxyapatite. Journal of American Ceramic Society, 84. pp. 1710-1716.

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Abstract

The dispersibility in deionized water of hydroxyapatite (HA) synthesized by a high-temperature (1000°C) solid-state reaction between tricalcium phosphate and calcium hydroxide was investigated as a function of the pH of the medium and the quantity of two dispersing agents (A 5 inorganic, B 5 organic)added to the slips. Although pH modification had a negligible effect on dispersibility, both of the dispersing agents produced a good dispersion at considerably higher concentrations (>2 wt% of HA). At optimum amounts (2–4 wt%) of the dispersing agents, the slips showed near-Newtonian flow behavior up to 45 wt% solids loading and non-Newtonian behavior at >50 wt%. By the optimal addition of dispersing agents and conditioning by ball milling, 60–67 wt% (32–39 vol%) solids-loaded HA slips could be cast into plaster molds to produce 50%–58% dense green bodies, which, in turn, sintered to 90%–94% density in the temperature range 1300°–1400°C. The sintered HA exhibited a three-point flexural strength of 40–60 MPa and a homogeneous microstructure, with interspersed microporosities.

Item Type: Article
Uncontrolled Keywords: Slip Casting Hydroxyapatite
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: Users 10 not found.
Date Deposited: 15 Jan 2014 04:07
Last Modified: 28 Oct 2015 07:04
URI: http://nal-ir.nal.res.in/id/eprint/11895

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