Kiyoshi Nogi1, Hiroyuki Takeda2, Masao Komatsu3, Nobuya Iwamoto4 and Kazumi Ogino5
1Department of Materials Science and Processing, Faculty of Engineering, Osaka University, Osaka. Present address: Welding Research Institute, Osaka University, Osaka
Effect of applying a DC voltage on the interfacial reaction at the aluminum-zirconia interface was studied utilizing an oxygen ionic conductivity of zirconia. In this system, a reaction occurs at the interface even if a DC voltage is not applied. This study was carried out using a conventional transmission electron microscopy and/or a ultra-high voltage electron microscopy.
Interfacial reactions were strongly affected by applying a DC voltage. Zr2Al3 and (Al2O3)δ were formed at the interface when a DC voltage was not applied. On the other hand, two phases were formed at the interface when a DC voltage was applied. One was the reaction layer which consisted of small grains. The other was α-Al2O3 or (Al2O3)δ.
zirconia, aluminum filler, joining, brazing, ceramics conventional transmission electron microscopy, ultra-high voltage electron microscopy
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