Friction Bonding of Ceramics to Metal with Intermediate Layer(Materials, Metallurgy & Weldability)

概要

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Intermediate layers of various metals ranging from active metals to noble metals have been applied to the friction bonding of ceramics to metal, and their influences on the bondability have been systematically investigated. The ceramics specimens to be bonded were SiC (pressureless-sintered silicon carbide) and ZrO_2 (partially stabilized zirconia including 3mol% MgO), and the metal specimen was Cu (oxygen free copper). When foils of active metals Al, Ti, Zr, and Nb were applied as an intermediate layer, the bondability of Cu to both SiC and ZrO_2 was improved remarkably, and bonded joints of Cu to SiC and ZrO_2 could be obtained. In contrast to this, when intermediate layers of Fe, Ni, and Ag were applied, the bondability was not influenced significantly by the intermediate layer, i.e., similarly to the case of bonding without an intermediate layer, the SiC and ZrO_2 specimens separated from the Cu specimen immediately after the bonding operation without application of an external load. In Cu next to the ceramics-metal interface, a region extending over 〜10^2μm from the interface was formed in which the intermediate layer was mixed mechanically with Cu, but no reaction layer between the ceramics and metals could be found.
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