Sintering of hydroxyapatite lath-like powders

• Published in: Journal of Thermal Analysis and Calorimetry Vol. 84; no. 1; pp. 165 - 174
• Main Authors: KOUMOULIDIS, G. C, TRAPALIS, C. C, VAIMAKIS, T. C
• Format: Conference Proceeding Journal Article
• Language: English
• Published: Dordrecht Springer 01.04.2006
• Subjects: Chemistry; Colloidal state and disperse state; Exact sciences and technology; General and physical chemistry; Powders; Phosphates; Fourier transformation; Thermogravimetry; Hydroxyapatite; sintering-B; X ray diffraction; Powder; Whisker; Calcining; Surface structure; Infrared spectrometry; apatite-D; Transmission electron microscopy; calcination-A; Sintering; Morphology; whiskers-C; Thermal analysis; Medical application; biomedical applications-E
• ISSN: 1388-6150; 1588-2926; 1572-8943; 0368-4466
• DOI: 10.1007/s10973-005-7210-x

Hydroxyapatite powders, which consisted of lath-like single-crystalline particles, were calcined at two different temperatures. Green and calcined powders were used for sintering HAp ceramic samples under uniaxial pressing. Powders and sintered samples were studied using various analytical techniques in order to determine how calcination affects the particle properties and the sintering behavior of HAp powders. It was found that calcination decreases the particles length and changes the particles morphology from lath-like to spherical shape. The relative density increases with increasing calcination temperature and aging time. It was found that long aging time favor the formation of thermally stable HAp particles, whereas a shorter one results in the formation of beta-calcium phosphate during thermal treatment. Sintering of compacted powders begins at temperatures greater than 900DGC, with a trend to increase the onset temperature as the calcination temperature is increased.