| About this Abstract |
| Meeting |
Materials Science & Technology 2009
|
| Symposium
|
Characterization and Modeling of Ceramic-Ceramic and Metal-Ceramic Interfaces
|
| Presentation Title |
Liquid-Phase Bonded Aluminum/Sapphire Hetero Interface Structures |
| Author(s) |
Christine Marie Montesa, Naoya Shibata, Si-Young Choi, Hiroshi Tonomura, Kazuhiro Akiyama, Yoshirou Kuromitsu, Yuichi Ikuhara |
| On-Site Speaker (Planned) |
Christine Marie Montesa |
| Abstract Scope |
Aluminum/Sapphire systems are used in complex metal/ceramic interfaces for many technological applications. In power devices, Al-Silicon alloy is an effective blazing material, which could bond Al with alumina substrates. However, the interface structures and its mechanism need to be clarified.
Liquid-phase bonded aluminum/sapphire interfaces were characterized using high-resolution electron microscopy and TEM-EDX. No preferred crystallographic orientation relationship was observed between Al and sapphire. Formation of the step structures of sapphire at the interface is the result of Al oxidation. The addition of Si in molten Al was discovered to affect the interface formation mechanism. Si was found to segregate and precipitate at the interface, which significantly reduced the step growth of sapphire. Si precipitates exhibit preferred orientation relationships with sapphire. These preferred orientation relationships are consistent with the prediction by the coincidence of reciprocal lattice point method. The addition of Si strongly modifies interface structures between Al and sapphire |
| Proceedings Inclusion? |
Undecided |