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Article: Hydrogen release from titanium hydride in foaming of orthopedic NiTi scaffolds

TitleHydrogen release from titanium hydride in foaming of orthopedic NiTi scaffolds
Authors
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
Citation
Acta Biomaterialia, 2011, v. 7 n. 3, p. 1387-1397 How to Cite?
Abstract
Titanium 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.
Persistent Identifierhttp://hdl.handle.net/10722/139549
ISSN
2013 Impact Factor: 5.684
2013 SCImago Journal Rankings: 2.005
ISI Accession Number ID
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.

References

 

Author Affiliations
  1. The University of Hong Kong
  2. City University of Hong Kong
  3. Hubei University
DC FieldValueLanguage
dc.contributor.authorWu, Sen_HK
dc.contributor.authorLiu, Xen_HK
dc.contributor.authorYeung, KWKen_HK
dc.contributor.authorHu, Ten_HK
dc.contributor.authorXu, Zen_HK
dc.contributor.authorChung, JCYen_HK
dc.contributor.authorChu, PKen_HK
dc.date.accessioned2011-09-23T05:51:33Z-
dc.date.available2011-09-23T05:51:33Z-
dc.date.issued2011en_HK
dc.identifier.citationActa Biomaterialia, 2011, v. 7 n. 3, p. 1387-1397en_HK
dc.identifier.issn1742-7061en_HK
dc.identifier.urihttp://hdl.handle.net/10722/139549-
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.en_HK
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/actabiomaten_HK
dc.relation.ispartofActa Biomaterialiaen_HK
dc.subjectCreep expansionen_HK
dc.subjectFoamsen_HK
dc.subjectHydrogen releaseen_HK
dc.subjectPorous NiTien_HK
dc.subjectScaffolden_HK
dc.subject.meshCalorimetry, Differential Scanning-
dc.subject.meshHydrogen - chemistry-
dc.subject.meshMicroscopy, Electron, Transmission-
dc.subject.meshNickel - chemistry-
dc.subject.meshTitanium - chemistry-
dc.titleHydrogen release from titanium hydride in foaming of orthopedic NiTi scaffoldsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1742-7061&volume=7&issue=3&spage=1387&epage=1397&date=2011&atitle=Hydrogen+release+from+titanium+hydride+in+foaming+of+orthopedic+NiTi+scaffolds-
dc.identifier.emailYeung, KWK:wkkyeung@hkucc.hku.hken_HK
dc.identifier.authorityYeung, KWK=rp00309en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.actbio.2010.10.008en_HK
dc.identifier.pmid20965283en_HK
dc.identifier.scopuseid_2-s2.0-79251537784en_HK
dc.identifier.hkuros192182en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79251537784&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume7en_HK
dc.identifier.issue3en_HK
dc.identifier.spage1387en_HK
dc.identifier.epage1397en_HK
dc.identifier.isiWOS:000287643900051-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridWu, S=15125218800en_HK
dc.identifier.scopusauthoridLiu, X=36092970100en_HK
dc.identifier.scopusauthoridYeung, KWK=13309584700en_HK
dc.identifier.scopusauthoridHu, T=25948400300en_HK
dc.identifier.scopusauthoridXu, Z=35276485200en_HK
dc.identifier.scopusauthoridChung, JCY=7404002978en_HK
dc.identifier.scopusauthoridChu, PK=36040705700en_HK

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