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Phase transformation and microstructural development of zirconia/stainless steel bonded with a Ti/Ni/Ti interlayer for the potential application in solid oxide fuel cells

Published online by Cambridge University Press:  09 April 2014

Shen-Hung Wei  and
Chien-Cheng Lin
Shen-Hung Wei
Affiliation:
Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30050, Taiwan
Chien-Cheng Lin*
Affiliation:
Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30050, Taiwan
*
a)Address all correspondence to this author. e-mail: chienlin@faculty.nctu.edu.tw
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Abstract

The 8 mol% yttria-stabilized zirconia (8Y-ZrO2) was bonded to stainless steel 316L at 900 °C for 1 h in a protective Ar atmosphere using an interlayer of Ti/Ni/Ti. Interfacial microstructures were characterized using both secondary electron microscope (SEM) and transmission electron microscope (TEM), each with an attached energy dispersive spectroscope (EDS). A layer sequence of σ-phase/TiFe2/TiFe + β-Ti/Ti2Fe was observed at the stainless steel 316L/Ti interface, whereas a layer sequence of Ti2Ni/Ti2Ni + TiNi/TiNi3 was found at the Ti/Ni interface. Furthermore, TiO and c-ZrO2−x formed at the Ti/8Y-ZrO2 interface. An acicular α-Ti and a fine ω-phase existed along with β-Ti in the residual Ti foil adjacent to the stainless steel 316L, but α-Ti and Ti2Ni were observed within β-Ti in the other residual Ti foil adjacent to the 8Y-ZrO2. The orientation relationships of the ω-phase and β-Ti were ${\left[ {1\bar 10} \right]_{{\rm{ \beta {\hbox-} Ti}}}}//{\left[ {1\bar 210} \right]_{\rm{\omega }}}$ and ${\left( {111} \right)_{{\rm{\beta {\hbox-} Ti}}}}//{\left( {0001} \right)_{\rm{\omega }}}$, respectively. The microstructural development was elucidated with the aid of Fe–Ti and Ni–Ti binary phase diagrams.

Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 8 , 28 April 2014 , pp. 923 - 934
Copyright
Copyright © Materials Research Society 2014 

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