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Abstract

During architectural and archaeological studies conducted in 1983 and 1985 at the site of medieval Ołbin Abbey, located in the Wrocław quarter of Ołbin, eight coins were found; six of them were analysed. These are late medieval and modern coins. All coins were precisely identified and described. Studies of the elemental composition of coins were undertaken with a non-destructive method, using X-ray fluorescence spectrometry. The results of analyses showed that coins were made from an alloy of copper and silver with varied content of main elements.
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Abstract

The subject of the study was the production and characterization of three ceramic-metal graded composites, which differed in addition of the metallic phase. The following composites systems were investigated: Al2O3-Mo, Al2O3-Cu, Al2O3-W. Composites were produced by centrifugal slip casting method. This technique combines the classic casting of the slurry into porous molds with the action of centrifugal force. As a result, sleeve-shaped shapes with a metallic phase gradient were obtained. X-ray phase analysis have not revealed new phases in the produced composites. The type of metallic phase and its distribution in the ceramic matrix influenced the hardness of the produced composites.
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