An Electron Microscopy Analysis of a Simple Metal/Ceramic Interface
The study of metal-ceramic interfaces is of fundamental importance in materials science because of the many technological applications for devices fabricated with both metal and ceramic components. For example, MOS devices, metal-ceramic seals, refractory metal alloy coatings to cite only a few. Notwithstanding its importance, the direct study of interfacial structure of metal-ceramic composites by transmission electron microscopy is difficult due to specimen preparation problems. However, some insights into the structures may be obtained through the more indirect but conventional path of forming the ceramic phase in a metal matrix by a precipitation reaction. In the present study high purity tantalum-carbon alloys were prepared and quenched in ultra-high vacuum and aged to produce large precipitates of the stable Ta2C carbide phase. In addition to determining the orientation relationship, diffraction contrast analysis and lattice fringe imaging techniques were employed to characterize the interface structures.
KeywordsOrientation Relationship Electron Microscopy Analysis Lattice Dislocation Close Packed Plane Coherency Stress
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