This study is concerned with direct bonding of copper-alumina ceramics employing copper-oxygen eutectic melt. Electrolytic copper was bonded to the alumina ceramics at the temperature between melting temperature of pure copper and copper-oxygen eutectic temperature in commercial high purity nitrogen gas.
Bonding mechanism and the effects of apparent density and surface roughness of alumina ceramics on the bond strength were investigated.
The result indicated that the copper bonded to the alumina ceramics by means of Cu$_2$O nodules which were formed from Cu-O eutectic melt. Stronger bond strength was observed in the ceramic of higher apparent density and smoother surface.