ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Optical Transmittance Changes of Solid Preforms with Temperature. I. High Pressure Densified Hydroxyapatite Gels

R. Ďurovčíková, V. Kremničan, Š. Kovalík, Š. Svetík, J. Krištín, P. M. Marquis, and J. Majling

Department of Ceramics, Glass, and Cement, Faculty of Chemical Technology, Slovak University of Technology, SK-812 37 Bratislava

Abstract: The light transmittance-temperature patterns are recorded and partially interpreted for thin pellets of hydroxyapatite gels consolidated by the cold isostatic pressure (500 MPa and 1000 MPa). In the course of processing the precipitated wet gels were washed by methanol, ethanol, and propanol, prior to their drying and a subsequent high pressure consolidation.Three important processes taking place have been identified by means of these patterns: the elementary carbon evolution and its subsequent oxidation at temperatures around 600°C, the shrinkage of samples in the temperature interval between 700°C and 1000°C, and also a bloating of samples at temperatures above 1000°C.

Full paper in Portable Document Format: 531a16.pdf

Chemical Papers 53 (1) 16–21 (1999)