Stoichiometry of hydroxyapatite: influence on the flexural strength

Autor: A. Royer, M. Heughebaert, J. C. Viguie, J. C. Heughebaert
Rok vydání: 1993
Předmět:
Zdroj: Journal of Materials Science: Materials in Medicine. 4:76-82
ISSN: 1573-4838
0957-4530
DOI: 10.1007/bf00122982
Popis: This paper reports results on the sintering behaviour of hydroxyapatite (HAP) for various compositions and its resultant flexural strength. The HAP decomposition occurs at higher temperatures for sintered compacts than for powder and their OH stoichiometry depends on the porosity-closing temperature. The mechanical behaviour of HAP depends on its composition: the best results are obtained for HAP containing tricalcium phosphate (TCP), whereas for nearly pure HAP the flexural strength decreases to the lowest results corresponding to HAP containing CaO. It is suggested that the strengthening of HAP by TCP involves surface compression due to the β → α TCP transformation.
Databáze: OpenAIRE
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