Characterization of yttria-stabilized zirconia foils and development of a brazing process with TA6V for biomedical applications
Identifieur interne : 000400 ( Main/Exploration ); précédent : 000399; suivant : 000401Characterization of yttria-stabilized zirconia foils and development of a brazing process with TA6V for biomedical applications
Auteurs : Cécile Le Coadou [France]Source :
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Abstract
Neurodegenerative diseases are increasingly present in our society but they are also better known and treated. For example, deep brain stimulation is nowadays used to treat diseases such as Parkinson disease. For this purpose, a pacemaker-like device localized in the infraclavicular region is commonly used to deliver electrical pulses in concerned area of the brain thanks to electrodes. In order to avoid some complications, an ultrathin housing was designed. It could be directly implanted under the scalp, close to the area to be treated. Materials of the housing have to be display some features. TA6V, yttria-stabilized zirconia sheets and a hermetic brazing with a Ti2Ni joint were selected to develop this housing.Yttria-stabilized zirconia sheets have remarkable properties but they undergo a degradation caused by hydrothermal aging. An accelerated aging study was done on pristine sheets but also under near-reality conditions. The observed aging is sufficiently limited to consider an in vivo application, subject to one reservation for the under-stoichiometric zirconia. Finally, the aging profile and the propagation rate were specified.The TA6V-zirconia joining was obtained by an in situ reactive brazing, thanks to a filler metal in pure nickel and the formation of a Ti2Ni joint. Several phenomena occur in the TA6V-Ni-ZrO2 system, which were separately studied: (solid and liquid) diffusion, formation and growth of intermetallic compounds and redox reactions. The intermetallic compounds growth from the TA6V-Ni couple was studied in detail. Thanks to all of the results, a metal-ceramic brazing process for ultrathin materials was identified and successfully achieved on our system.
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For example, deep brain stimulation is nowadays used to treat diseases such as Parkinson disease. For this purpose, a pacemaker-like device localized in the infraclavicular region is commonly used to deliver electrical pulses in concerned area of the brain thanks to electrodes. In order to avoid some complications, an ultrathin housing was designed. It could be directly implanted under the scalp, close to the area to be treated. Materials of the housing have to be display some features. TA6V, yttria-stabilized zirconia sheets and a hermetic brazing with a Ti2Ni joint were selected to develop this housing.Yttria-stabilized zirconia sheets have remarkable properties but they undergo a degradation caused by hydrothermal aging. An accelerated aging study was done on pristine sheets but also under near-reality conditions. The observed aging is sufficiently limited to consider an in vivo application, subject to one reservation for the under-stoichiometric zirconia. Finally, the aging profile and the propagation rate were specified.The TA6V-zirconia joining was obtained by an in situ reactive brazing, thanks to a filler metal in pure nickel and the formation of a Ti2Ni joint. Several phenomena occur in the TA6V-Ni-ZrO2 system, which were separately studied: (solid and liquid) diffusion, formation and growth of intermetallic compounds and redox reactions. The intermetallic compounds growth from the TA6V-Ni couple was studied in detail. Thanks to all of the results, a metal-ceramic brazing process for ultrathin materials was identified and successfully achieved on our system.</div></front></TEI><affiliations><list><country><li>France</li></country></list><tree><country name="France"><noRegion><name sortKey="Le Coadou, Cecile" sort="Le Coadou, Cecile" uniqKey="Le Coadou C" first="Cécile" last="Le Coadou">Cécile Le Coadou</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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