Abstract
Results from a brief study of pore removal during diffusion bonding of interfaces between Nb and Al2O3 are presented. Sequential observations of the evolution of interface microstructure during the later stages of diffusion bonding indicates that pore removal occurs by the growth of bonding fronts in particular crystallographic directions dependent on the orientation of Nb, but not on that of the Al2O3. Bonding fronts meet, resulting in cylindrical voids which then breakup into uniformly distributed spherical voids. Characterization of the breakup suggests that the process is volume diffusion controlled. Finally, the effect of thermal grooving of Nb grain boundaries on mass transport during diffusion bonding is discussed.
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