Physicochemical differences after densifying radio frequency plasma sprayed hydroxyapatite powders using spark plasma and conventional sintering techniques

The aim of this comparative study was to elucidate the characterization of spherical radio frequency (RF) plasma sprayed hydroxyapatite (HA) powder consolidated by spark plasma sintering (SPS) and conventional sintering methods. SPS processing took place under low vacuum of 4.5 Pa at the temperature...

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Main Authors: Kumar, R., Xu, Jinling, Khor, Khiam Aik
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2012
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Online Access:https://hdl.handle.net/10356/95568
http://hdl.handle.net/10220/8520
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-955682023-03-04T17:18:17Z Physicochemical differences after densifying radio frequency plasma sprayed hydroxyapatite powders using spark plasma and conventional sintering techniques Kumar, R. Xu, Jinling Khor, Khiam Aik School of Mechanical and Aerospace Engineering DRNTU::Science::Chemistry::Physical chemistry::Plasma chemistry The aim of this comparative study was to elucidate the characterization of spherical radio frequency (RF) plasma sprayed hydroxyapatite (HA) powder consolidated by spark plasma sintering (SPS) and conventional sintering methods. SPS processing took place under low vacuum of 4.5 Pa at the temperature of 900–1200 °C for 3 min with a heating rate of 100 °C/min. The conventional processing was conducted at the temperatures of 1000–1400 °C in dilatometer furnace in the nitrogen for various periods (2 h and 5 h) with various heating rates (5 °C/min, 10 °C/min and 20 °C/min). The scanning electron microscope (SEM) images of the microstructure revealed a similar morphology obtained in the sample consolidated by conventional processing at 1100 °C with a dwell time of 2 h when compared with the sample prepared at 900 °C for 3 min using SPS technique. It was found that HA was the dominant phase in the samples densified to above 90% of relative density using SPS technique at the temperatures between 1000 °C and 1200 °C. As a comparison, a maximum density of 2.86 g/cm3 was achieved using the conventional method at 1200 °C with a dwell time of 5 h. A large amount of tetra-calcium phosphate (TTCP) and α/β-tricalcium phosphate (α/β-TCP) was detected in the ceramic samples consolidated using the conventional process. This comparison of SPS with conventional sintering showed that the former to be an effective fabrication process for spherical HA powder with optimized microstructure and phase composition. Accepted version 2012-09-13T07:20:39Z 2019-12-06T19:17:32Z 2012-09-13T07:20:39Z 2019-12-06T19:17:32Z 2007 2007 Journal Article Xu, J., Khor, K. A., & Kumar, R. (2007). Physicochemical differences after densifying radio frequency plasma sprayed hydroxyapatite powders using spark plasma and conventional sintering techniques. Materials Science and Engineering: A, 457(1-2), 24-32. 0921-5093 https://hdl.handle.net/10356/95568 http://hdl.handle.net/10220/8520 10.1016/j.msea.2007.01.110 en Materials science and engineering: A © 2007 Elsevier B.V. This is the author created version of a work that has been peer reviewed and accepted for publication by Materials Science and Engineering: A, Elsevier B.V. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [DOI: http://dx.doi.org/10.1016/j.msea.2007.01.110] application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Science::Chemistry::Physical chemistry::Plasma chemistry
spellingShingle DRNTU::Science::Chemistry::Physical chemistry::Plasma chemistry
Kumar, R.
Xu, Jinling
Khor, Khiam Aik
Physicochemical differences after densifying radio frequency plasma sprayed hydroxyapatite powders using spark plasma and conventional sintering techniques
description The aim of this comparative study was to elucidate the characterization of spherical radio frequency (RF) plasma sprayed hydroxyapatite (HA) powder consolidated by spark plasma sintering (SPS) and conventional sintering methods. SPS processing took place under low vacuum of 4.5 Pa at the temperature of 900–1200 °C for 3 min with a heating rate of 100 °C/min. The conventional processing was conducted at the temperatures of 1000–1400 °C in dilatometer furnace in the nitrogen for various periods (2 h and 5 h) with various heating rates (5 °C/min, 10 °C/min and 20 °C/min). The scanning electron microscope (SEM) images of the microstructure revealed a similar morphology obtained in the sample consolidated by conventional processing at 1100 °C with a dwell time of 2 h when compared with the sample prepared at 900 °C for 3 min using SPS technique. It was found that HA was the dominant phase in the samples densified to above 90% of relative density using SPS technique at the temperatures between 1000 °C and 1200 °C. As a comparison, a maximum density of 2.86 g/cm3 was achieved using the conventional method at 1200 °C with a dwell time of 5 h. A large amount of tetra-calcium phosphate (TTCP) and α/β-tricalcium phosphate (α/β-TCP) was detected in the ceramic samples consolidated using the conventional process. This comparison of SPS with conventional sintering showed that the former to be an effective fabrication process for spherical HA powder with optimized microstructure and phase composition.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Kumar, R.
Xu, Jinling
Khor, Khiam Aik
format Article
author Kumar, R.
Xu, Jinling
Khor, Khiam Aik
author_sort Kumar, R.
title Physicochemical differences after densifying radio frequency plasma sprayed hydroxyapatite powders using spark plasma and conventional sintering techniques
title_short Physicochemical differences after densifying radio frequency plasma sprayed hydroxyapatite powders using spark plasma and conventional sintering techniques
title_full Physicochemical differences after densifying radio frequency plasma sprayed hydroxyapatite powders using spark plasma and conventional sintering techniques
title_fullStr Physicochemical differences after densifying radio frequency plasma sprayed hydroxyapatite powders using spark plasma and conventional sintering techniques
title_full_unstemmed Physicochemical differences after densifying radio frequency plasma sprayed hydroxyapatite powders using spark plasma and conventional sintering techniques
title_sort physicochemical differences after densifying radio frequency plasma sprayed hydroxyapatite powders using spark plasma and conventional sintering techniques
publishDate 2012
url https://hdl.handle.net/10356/95568
http://hdl.handle.net/10220/8520
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