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

Ruys, AJ; Brandwood, A; Milthorpe, BK; Dickson, MR; Zeigler, KA; Sorrell, CC

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

Ruys, AJ Brandwood, A Milthorpe, BK

Dickson, MR Zeigler, KA Sorrell, CC

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Publication Type:: Journal Article
Citation:: Journal of Materials Science: Materials in Medicine, 1995, 6 (5), pp. 297 - 301
Issue Date:: 1995-05-01

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Field	Value	Language
dc.contributor.author	Ruys, AJ	en_US
dc.contributor.author	Brandwood, A	en_US
dc.contributor.author	Milthorpe, BK https://orcid.org/0000-0002-0867-9586	en_US
dc.contributor.author	Dickson, MR	en_US
dc.contributor.author	Zeigler, KA	en_US
dc.contributor.author	Sorrell, CC	en_US
dc.date.issued	1995-05-01	en_US
dc.identifier.citation	Journal of Materials Science: Materials in Medicine, 1995, 6 (5), pp. 297 - 301	en_US
dc.identifier.issn	0957-4530	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. © 1995 Chapman & Hall.	en_US
dc.relation.ispartof	Journal of Materials Science: Materials in Medicine	en_US
dc.relation.isbasedon	10.1007/BF00120274	en_US
dc.subject.classification	Biomedical Engineering	en_US
dc.title	The effects of sintering atmosphere on the chemical compatibility of hydroxyapatite and particulate additives at 1200°C	en_US
dc.type	Journal Article
utslib.citation.volume	5	en_US
utslib.citation.volume	6	en_US
utslib.for	090302 Biomechanical Engineering	en_US
utslib.for	090301 Biomaterials	en_US
utslib.for	110304 Dermatology	en_US
utslib.for	0903 Biomedical Engineering	en_US
utslib.for	0912 Materials Engineering	en_US
pubs.embargo.period	Not known	en_US
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 - CHT - Health Technologies
utslib.copyright.status	closed_access
pubs.issue	5	en_US
pubs.publication-status	Published	en_US
pubs.volume	6	en_US

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. © 1995 Chapman & Hall.

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