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

被引：13
|
作者：
Yasuda, H. Y. [1 ]
Mahara, S. [1 ]
Nishiyama, T. [1 ]
Umakoshi, Y. [1 ]
机构：
[1] Osaka Univ, Grad Sch Engn, Dept Mat Sci & Engn, 2-1 Yamada Oka, Suita, Osaka 5650871, Japan
来源：
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS | 2002年 / 3卷 / 01期
基金：
日本学术振兴会;
关键词：
Hydroxyapatite; Tricalcium phosphate; Colloidal process; Pressure filtration;
D O I：
10.1016/S1468-6996(01)00149-8
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Synthesised hydroxyapatite (HAp)/alpha-tricalcium phosphate (alpha-TCP) composites were prepared by colloidal process. Mixed slurries composed of 30 vol% HAp/alpha-TCP powder and 70 vol% aqueous solution containing a small amount of polymer dispersant were produced. HAp/alpha-TCP powder was blended with 0, 0.2, 0.4 or 1.0 mass fraction of alpha-TCP. Rheological behaviour of the HAp/alpha-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 alpha-TCP. In the dehydration process of the slurries, pressure filtration technique was effective in preventing the gravity segregation of alpha-TCP. Thus, HAp/alpha-TCP composites with homogeneous microstructure and high relative density could be prepared by optimising the colloidal process. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：29 / 33
页数：5
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