Effect of operation conditions on HA synthesized by the hydrothermal method

Chandrasekhar Rama Kothapalli; Mei Wei; Montgomery T. Shaw

doi:10.4028/0-87849-961-x.51

Effect of operation conditions on HA synthesized by the hydrothermal method

Chandrasekhar Rama Kothapalli
, Mei Wei
, Montgomery T. Shaw

Chemical and Biomedical Engineering

University of Connecticut

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

1 Scopus citations

Abstract

This paper reports the influence of aging time and reaction temperature on the surface morphology and mechanical properties of hydroxyapatite (HA) synthesized by a hydrothermal method. Calcium nitrate and ammonium orthophosphate solutions were premixed and fed to an autoclave and reacted to temperatures varying between 25-250°C for 2-10 h. Results indicate the strong positive influence of reaction temperature on the HA particle aspect ratio. The density of the discs pressed from these samples reached 85-90% of the theoretical density after calcination at 1200°C for 1 h. Sintered density and flexural strength were found to increase with increasing aging time and reaction temperature. A maximum flexural strength of 78 MPa was observed for the sample synthesized at 170°C for 5 h with the predicted average at these conditions being 65 MPa.

Original language	English
Pages (from-to)	51-54
Number of pages	4
Journal	Key Engineering Materials
Volume	284-286
DOIs	https://doi.org/10.4028/0-87849-961-x.51
State	Published - Jan 1 2005

Keywords

Density strength
Flexural strength
Hydrothermal method
Hydroxyapatite
Particle size distribution

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10.4028/0-87849-961-x.51

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title = "Effect of operation conditions on HA synthesized by the hydrothermal method",

abstract = "This paper reports the influence of aging time and reaction temperature on the surface morphology and mechanical properties of hydroxyapatite (HA) synthesized by a hydrothermal method. Calcium nitrate and ammonium orthophosphate solutions were premixed and fed to an autoclave and reacted to temperatures varying between 25-250°C for 2-10 h. Results indicate the strong positive influence of reaction temperature on the HA particle aspect ratio. The density of the discs pressed from these samples reached 85-90\% of the theoretical density after calcination at 1200°C for 1 h. Sintered density and flexural strength were found to increase with increasing aging time and reaction temperature. A maximum flexural strength of 78 MPa was observed for the sample synthesized at 170°C for 5 h with the predicted average at these conditions being 65 MPa.",

keywords = "Density strength, Flexural strength, Hydrothermal method, Hydroxyapatite, Particle size distribution",

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T1 - Effect of operation conditions on HA synthesized by the hydrothermal method

AU - Kothapalli, Chandrasekhar Rama

AU - Wei, Mei

AU - Shaw, Montgomery T.

PY - 2005/1/1

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N2 - This paper reports the influence of aging time and reaction temperature on the surface morphology and mechanical properties of hydroxyapatite (HA) synthesized by a hydrothermal method. Calcium nitrate and ammonium orthophosphate solutions were premixed and fed to an autoclave and reacted to temperatures varying between 25-250°C for 2-10 h. Results indicate the strong positive influence of reaction temperature on the HA particle aspect ratio. The density of the discs pressed from these samples reached 85-90% of the theoretical density after calcination at 1200°C for 1 h. Sintered density and flexural strength were found to increase with increasing aging time and reaction temperature. A maximum flexural strength of 78 MPa was observed for the sample synthesized at 170°C for 5 h with the predicted average at these conditions being 65 MPa.

AB - This paper reports the influence of aging time and reaction temperature on the surface morphology and mechanical properties of hydroxyapatite (HA) synthesized by a hydrothermal method. Calcium nitrate and ammonium orthophosphate solutions were premixed and fed to an autoclave and reacted to temperatures varying between 25-250°C for 2-10 h. Results indicate the strong positive influence of reaction temperature on the HA particle aspect ratio. The density of the discs pressed from these samples reached 85-90% of the theoretical density after calcination at 1200°C for 1 h. Sintered density and flexural strength were found to increase with increasing aging time and reaction temperature. A maximum flexural strength of 78 MPa was observed for the sample synthesized at 170°C for 5 h with the predicted average at these conditions being 65 MPa.

KW - Density strength

KW - Flexural strength

KW - Hydrothermal method

KW - Hydroxyapatite

KW - Particle size distribution

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Effect of operation conditions on HA synthesized by the hydrothermal method

Abstract

Keywords

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