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

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

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dc.contributor.author Xu, Jinling.
dc.contributor.author Khor, Khiam Aik.
dc.contributor.author Kumar, R.
dc.date.accessioned 2012-09-13T07:20:39Z
dc.date.available 2012-09-13T07:20:39Z
dc.date.copyright 2007
dc.date.issued 2012-09-13
dc.identifier.citation 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.
dc.identifier.issn 0921-5093
dc.identifier.uri http://hdl.handle.net/10220/8520
dc.description.abstract 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.
dc.language.iso en
dc.relation.ispartofseries Materials science and engineering: A
dc.rights © 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]
dc.subject DRNTU::Science::Chemistry::Physical chemistry::Plasma chemistry.
dc.title Physicochemical differences after densifying radio frequency plasma sprayed hydroxyapatite powders using spark plasma and conventional sintering techniques.
dc.type Journal Article
dc.contributor.school School of Mechanical and Aerospace Engineering
dc.identifier.doi http://dx.doi.org/10.1016/j.msea.2007.01.110
dc.description.version Accepted version

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