The effect of cross-sectional preparation on the structural properties of the sample

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Supervisor:
Dr. Gordon Péter Róbert
Department of Electronics Technology

The department of Electronic Technology at Budapest University of Technology and Economics is making and analysing a huge amount of metallographic cross-section specimens for it own objectives as well as for external orders. I studied the cross-section making for two reasons, from two aspects. In some cases of making the specimens, the effects of cutting procedures have not been examined. In this paper I studied the potential ways of cutting. I studied their advantages, disadvantages, and their possible effects on the results of the analysis of cross-section specimens. In addition I studied the ability of the new polarizing filters of the Department's optical microscope from the viewpoint of metallographic cross-section making. I oversaw the parameters of the basic steps of cross-section making with the new polarized light microscopy.

According to the results, none of the expected problems of cutting appeared in practice. The cutting procedures could have an effect on the electircal components or in the solder, but those effects did not change the final results. With the help of the new polarizing filters of the optical microscope, I could make pictures that gave completely new kind of information about the specimens. The technical and structural solution of the new ability has its own problems, however the images showed clear differences between specimens of the solders cooled and crystallized by different speeds.

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