Surface contamination of alumina ceramics by carbon
Keywords:aluminium oxide (alumina) ceramics (Al2O3), contamination, scanning electron microscope (SEM), emulsion, carbon
AbstractThis study presents the results of investigating thecause of contamination of aluminum oxideceramics (Al2O3) in the form of brown coloredstain. Contaminated ceramic surfaces wereexamined with the scanning electron microscope(SEM) equipped with the Energy DispersiveSpectrometer (EDS). The results show theexistence of the carbon in contaminated surfacethat does not exist in the basic raw materialscomposition, not even in traces. To determine theplace and source of contamination, theinvestigations of the production process werecarried out by stages. It was found that the semifinishedproduct occurs in contact with carbon attwo stages in the manufacturing process; bysintering semi-finished product on carbon platesand cooling with emulsion that contains carbon intraces during cutting. It was shown thatcontamination occurs in contact with aluminaceramics sintered on carbon plates.
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