A Novel Approach To Ceramic/Metal Joining(Physics, Processes, Instruments & Measurements)

概要

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The joining of ceramics to metals is problematic primarily due to the vastly different atomic bonding in these materials. In an attempt to overcome this problem MEVVA ion implantation of titanium into alumina was performed to modify the physico-chemical properties and microstructure in the near surface region of the ceramic. The brazing of alumina to copper, before and after implantation, was performed using both reactive (titanium containing) and non-reactive Cu-Ag eutectic brazes. It has been established, for the first time, that metallic implantation of ceramic enables joining to metal with non-reactive braze. Extensive characterisation of faying surfaces was carried out by Rutherford Backscattering (RBS), four point probe conductivity tests, and braze wettability tests. Further, the microstructural evolution of implanted ceramic surfaces was elucidated by detailed cross-sectional transmission electron microscopy (XTEM) in conjunction with nanobeam electron diffraction (NBED). It has been demonstrated that implantation drastically changes the nature of bonding in alumina by forming metallic-like compounds such as TiO_2 thus enhancing the degree of wetting by non-reactive braze compared to the unimplanted alumina.
大阪大学の論文