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Article: Hydrogen release from titanium hydride in foaming of orthopedic NiTi scaffolds
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TitleHydrogen release from titanium hydride in foaming of orthopedic NiTi scaffolds
 
AuthorsWu, S2 3
Liu, X3 2 1
Yeung, KWK1
Hu, T2
Xu, Z2 3
Chung, JCY2
Chu, PK2
 
KeywordsCreep expansion
Foams
Hydrogen release
Porous NiTi
Scaffold
 
Issue Date2011
 
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/actabiomat
 
CitationActa Biomaterialia, 2011, v. 7 n. 3, p. 1387-1397 [How to Cite?]
DOI: http://dx.doi.org/10.1016/j.actbio.2010.10.008
 
AbstractTitanium hydride powders are utilized to enhance the foaming process in the formation of orthopedic NiTi scaffolds during capsule-free hot isostatic pressing. In order to study the formation mechanism, the thermal behavior of titanium hydride and hydrogen release during the heating process are systematically investigated in air and argon and under vacuum by X-ray diffraction (XRD), thermal analysis, including thermogravimetric analysis and differential scanning calorimetry, energy dispersive X-ray spectroscopy, and transmission electron microscopy. Our experiments reveal that hydrogen is continuously released from titanium hydride as the temperature is gradually increased from 300 to 700 °C. Hydrogen is released in two transitions: TiH 1.924 → TiH 1.5/TiH 1.7 between 300 °C and 400 °C and TiH 1.5/TiH 1.7 → α-Ti between 400 °C and 600 °C. In the lower temperature range between 300 °C and 550 °C the rate of hydrogen release is slow, but the decomposition rate increases sharply above 550 °C. The XRD patterns obtained in air and under vacuum indicate that the surface oxide layer can deter hydrogen release. The pressure change is monitored in real time and the amount of hydrogen released is affected by the processing temperature and holding time. Holding processes at 425 °C, 480 °C, 500 °C, 550 °C, and 600 °C are found to significantly improve the porous structure in the NiTi scaffolds due to the stepwise release of hydrogen. NiTi scaffolds foamed by stepwise release of hydrogen are conducive to the attachment and proliferation of osteoblasts and the resulting pore size also favor in-growth of cells. © 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
 
ISSN1742-7061
2013 Impact Factor: 5.684
2013 SCImago Journal Rankings: 2.005
 
DOIhttp://dx.doi.org/10.1016/j.actbio.2010.10.008
 
ISI Accession Number IDWOS:000287643900051
Funding AgencyGrant Number
City University of Hong Kong7008009
National Natural Science Foundation of China50901032
Ministry of Education Specialized Research Foundation20094208120003
Hubei Provincial Natural Science Foundation2009CBD359
Funding Information:

This work was jointly supported by City University of Hong Kong Strategic Research Grant (SRG) No. 7008009, National Natural Science Foundation of China Grant No. 50901032, Ministry of Education Specialized Research Foundation for University Doctoral Program Grant No. 20094208120003, and Hubei Provincial Natural Science Foundation Grant No. 2009CBD359. S.L. Wu thanks Dr Kaili Zhang (City University of Hong Kong) for assistance with the TG analysis.

 
ReferencesReferences in Scopus
 
DC FieldValue
dc.contributor.authorWu, S
 
dc.contributor.authorLiu, X
 
dc.contributor.authorYeung, KWK
 
dc.contributor.authorHu, T
 
dc.contributor.authorXu, Z
 
dc.contributor.authorChung, JCY
 
dc.contributor.authorChu, PK
 
dc.date.accessioned2011-09-23T05:51:33Z
 
dc.date.available2011-09-23T05:51:33Z
 
dc.date.issued2011
 
dc.description.abstractTitanium hydride powders are utilized to enhance the foaming process in the formation of orthopedic NiTi scaffolds during capsule-free hot isostatic pressing. In order to study the formation mechanism, the thermal behavior of titanium hydride and hydrogen release during the heating process are systematically investigated in air and argon and under vacuum by X-ray diffraction (XRD), thermal analysis, including thermogravimetric analysis and differential scanning calorimetry, energy dispersive X-ray spectroscopy, and transmission electron microscopy. Our experiments reveal that hydrogen is continuously released from titanium hydride as the temperature is gradually increased from 300 to 700 °C. Hydrogen is released in two transitions: TiH 1.924 → TiH 1.5/TiH 1.7 between 300 °C and 400 °C and TiH 1.5/TiH 1.7 → α-Ti between 400 °C and 600 °C. In the lower temperature range between 300 °C and 550 °C the rate of hydrogen release is slow, but the decomposition rate increases sharply above 550 °C. The XRD patterns obtained in air and under vacuum indicate that the surface oxide layer can deter hydrogen release. The pressure change is monitored in real time and the amount of hydrogen released is affected by the processing temperature and holding time. Holding processes at 425 °C, 480 °C, 500 °C, 550 °C, and 600 °C are found to significantly improve the porous structure in the NiTi scaffolds due to the stepwise release of hydrogen. NiTi scaffolds foamed by stepwise release of hydrogen are conducive to the attachment and proliferation of osteoblasts and the resulting pore size also favor in-growth of cells. © 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
 
dc.description.natureLink_to_subscribed_fulltext
 
dc.identifier.citationActa Biomaterialia, 2011, v. 7 n. 3, p. 1387-1397 [How to Cite?]
DOI: http://dx.doi.org/10.1016/j.actbio.2010.10.008
 
dc.identifier.doihttp://dx.doi.org/10.1016/j.actbio.2010.10.008
 
dc.identifier.epage1397
 
dc.identifier.hkuros192182
 
dc.identifier.isiWOS:000287643900051
Funding AgencyGrant Number
City University of Hong Kong7008009
National Natural Science Foundation of China50901032
Ministry of Education Specialized Research Foundation20094208120003
Hubei Provincial Natural Science Foundation2009CBD359
Funding Information:

This work was jointly supported by City University of Hong Kong Strategic Research Grant (SRG) No. 7008009, National Natural Science Foundation of China Grant No. 50901032, Ministry of Education Specialized Research Foundation for University Doctoral Program Grant No. 20094208120003, and Hubei Provincial Natural Science Foundation Grant No. 2009CBD359. S.L. Wu thanks Dr Kaili Zhang (City University of Hong Kong) for assistance with the TG analysis.

 
dc.identifier.issn1742-7061
2013 Impact Factor: 5.684
2013 SCImago Journal Rankings: 2.005
 
dc.identifier.issue3
 
dc.identifier.openurl
 
dc.identifier.pmid20965283
 
dc.identifier.scopuseid_2-s2.0-79251537784
 
dc.identifier.spage1387
 
dc.identifier.urihttp://hdl.handle.net/10722/139549
 
dc.identifier.volume7
 
dc.languageeng
 
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/actabiomat
 
dc.publisher.placeNetherlands
 
dc.relation.ispartofActa Biomaterialia
 
dc.relation.referencesReferences in Scopus
 
dc.subject.meshCalorimetry, Differential Scanning
 
dc.subject.meshHydrogen - chemistry
 
dc.subject.meshMicroscopy, Electron, Transmission
 
dc.subject.meshNickel - chemistry
 
dc.subject.meshTitanium - chemistry
 
dc.subjectCreep expansion
 
dc.subjectFoams
 
dc.subjectHydrogen release
 
dc.subjectPorous NiTi
 
dc.subjectScaffold
 
dc.titleHydrogen release from titanium hydride in foaming of orthopedic NiTi scaffolds
 
dc.typeArticle
 
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Author Affiliations
  1. The University of Hong Kong
  2. City University of Hong Kong
  3. Hubei University