The effects of sintering atmosphere on the chemical compatibility of hydroxyapatite and particulate additives at 1200°C

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dc.contributor.author Ruys, AJ
dc.contributor.author Brandwood, A
dc.contributor.author Milthorpe, BK
dc.contributor.author Dickson, MR
dc.contributor.author Zeigler, KA
dc.contributor.author Sorrell, CC
dc.date.accessioned 2010-05-28T09:50:28Z
dc.date.issued 1995
dc.identifier.citation Journal of Materials Science: Materials in Medicine, 1995, 6 (5), pp. 297 - 301
dc.identifier.issn 0957-4530
dc.identifier.other C1UNSUBMIT en_US
dc.identifier.uri http://hdl.handle.net/10453/9565
dc.description.abstract According to Le Chatelier's principle, dehydration and the associated decomposition of hydroxyapatite (HAP) to biodegradable unhydrated calcium phosphates during sintering may be suppressed under a moist sintering atmosphere (thermodynamic effect), or possibly under a pressurized sintering atmosphere (physical effect), by opposing the release of water. The present study explored this possibility. High-purity powdered additives were used to minimize impurity and morphological effects. Al2O3, C, SiC, SiO2, ZrO2, and 316L stainless steel were all trialled at an addition level of 20 vol%. Heat treatment was at 1200°C for 1 h under two experimental atmospheres and two corresponding control atmospheres: flowing H2O/O2 mix-ambient air as a control; pressurized (1 MPa) argon-ambient argon (0.1 MPa) as a control. Specimens were analysed for decomposition by X-ray diffraction (XRD), for densification by porosity measurement, and for microstructural uniformity by energy dispersive spectroscopy (EDS) and image analysis. Significant decomposition occurred under all atmospheres with the exception of flowing H2O/O2 which eliminated decomposition in the HAP-Al2O3, HAP-ZrO2, and HAP-316L systems, and reduced the decomposition levels from near completion to - 50% in the HAP-SIC and HAP-SiO2 systems. Moistureless pressurization had little effect. Microstructural uniformity was confirmed. No generalized atmosphere-densification interrelationships were observed.
dc.language eng
dc.relation.isbasedon 10.1007/BF00120274
dc.title The effects of sintering atmosphere on the chemical compatibility of hydroxyapatite and particulate additives at 1200°C
dc.type Journal Article
dc.parent Journal of Materials Science: Materials in Medicine
dc.journal.volume 5
dc.journal.volume 6
dc.journal.number en_US
dc.publocation United States en_US
dc.identifier.startpage 297 en_US
dc.identifier.endpage 301 en_US
dc.cauo.name SCI.Medical and Molecular Biosciences en_US
dc.conference Verified OK en_US
dc.for 090302 Biomechanical Engineering
dc.for 090301 Biomaterials
dc.for 110304 Dermatology
dc.personcode 105631
dc.percentage 40 en_US
dc.classification.name Dermatology en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US
dc.date.activity en_US
dc.location.activity en_US
dc.description.keywords en_US
dc.description.keywords NA
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
pubs.organisational-group /University of Technology Sydney/Strength - Health Technologies


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