Densification behaviour and mechanisms of synthetic hydroxyapatites

E. Landi; A. Tampieri; G. Celotti; S. Sprio

doi:10.1016/S0955-2219(00)00154-0

Densification behaviour and mechanisms of synthetic hydroxyapatites

E. Landi, A. Tampieri, G. Celotti, S. Sprio

Houston Methodist

Research output: Contribution to journal › Article › peer-review

681 Scopus citations

Abstract

Starting from Ca(OH)₂ and H₃PO₄ hydroxyapatite powders with three different crystallinity degrees have been prepared and characterized. Densification extent and mechanisms were studied through dilatometric measurements in isothermal regime in the range of temperature 750-1250°C: the influence of difference powder features (including the effect of calcination treatment) have been evaluated. Powder characterized by the lowest crystallinity degree has the highest densification extent; overlapping phenomena occurring during the sintering treatments are responsible for unexpectedly low values found for the shrinkage rate, which can easily lead to a misidentification of the rate controlling mechanism. An interpretation of the densification mechanism, consistent with all experimental findings, is proposed.

Original language	English (US)
Pages (from-to)	2377-2387
Number of pages	11
Journal	Journal of the European Ceramic Society
Volume	20
Issue number	14-15
DOIs	https://doi.org/10.1016/S0955-2219(00)00154-0
State	Published - 2000

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

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10.1016/S0955-2219(00)00154-0

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abstract = "Starting from Ca(OH)2 and H3PO4 hydroxyapatite powders with three different crystallinity degrees have been prepared and characterized. Densification extent and mechanisms were studied through dilatometric measurements in isothermal regime in the range of temperature 750-1250°C: the influence of difference powder features (including the effect of calcination treatment) have been evaluated. Powder characterized by the lowest crystallinity degree has the highest densification extent; overlapping phenomena occurring during the sintering treatments are responsible for unexpectedly low values found for the shrinkage rate, which can easily lead to a misidentification of the rate controlling mechanism. An interpretation of the densification mechanism, consistent with all experimental findings, is proposed.",

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AU - Landi, E.

AU - Tampieri, A.

AU - Celotti, G.

AU - Sprio, S.

PY - 2000

Y1 - 2000

N2 - Starting from Ca(OH)2 and H3PO4 hydroxyapatite powders with three different crystallinity degrees have been prepared and characterized. Densification extent and mechanisms were studied through dilatometric measurements in isothermal regime in the range of temperature 750-1250°C: the influence of difference powder features (including the effect of calcination treatment) have been evaluated. Powder characterized by the lowest crystallinity degree has the highest densification extent; overlapping phenomena occurring during the sintering treatments are responsible for unexpectedly low values found for the shrinkage rate, which can easily lead to a misidentification of the rate controlling mechanism. An interpretation of the densification mechanism, consistent with all experimental findings, is proposed.

AB - Starting from Ca(OH)2 and H3PO4 hydroxyapatite powders with three different crystallinity degrees have been prepared and characterized. Densification extent and mechanisms were studied through dilatometric measurements in isothermal regime in the range of temperature 750-1250°C: the influence of difference powder features (including the effect of calcination treatment) have been evaluated. Powder characterized by the lowest crystallinity degree has the highest densification extent; overlapping phenomena occurring during the sintering treatments are responsible for unexpectedly low values found for the shrinkage rate, which can easily lead to a misidentification of the rate controlling mechanism. An interpretation of the densification mechanism, consistent with all experimental findings, is proposed.

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Densification behaviour and mechanisms of synthetic hydroxyapatites

Abstract

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