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Engineering Review : International journal for publishing of original researches from the aspect of structural analysis, materials and new technologies in the field of mechanical engineering, shipbuilding, fundamental engineering sciences, computer sciences, electrical engin, Vol. 37 No. 3, 2017.

Original scientific paper

Surface contamination of alumina ceramics by carbon

Stoja Rešković ; University of Zagreb Faculty of Metallurgy
Tin Brlić ; University of Zagreb Faculty of Metallurgy
Suzana Jakovljević ; University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture
Ivan Jandrlić ; University of Zagreb Faculty of Metallurgy

Full text: english PDF 832 Kb

page 335-340

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Abstract

This study presents the results of investigating the cause of contamination of aluminum oxide ceramics (Al2O3) in the form of brown colored stain. Contaminated ceramic surfaces were examined with the scanning electron microscope (SEM) equipped with the Energy Dispersive Spectrometer (EDS). The results show the existence of the carbon in contaminated surface that does not exist in the basic raw materials composition, not even in traces. To determine the place and source of contamination, the investigations of the production process were carried out by stages. It was found that the semifinished product occurs in contact with carbon at two stages in the manufacturing process; by sintering semi-finished product on carbon plates and cooling with emulsion that contains carbon in traces during cutting. It was shown that contamination occurs in contact with alumina ceramics sintered on carbon plates.

Keywords

aluminium oxide (alumina) ceramics (Al2O3); contamination; scanning electron microscope (SEM); emulsion; carbon

Hrčak ID:

184822

URI

https://hrcak.srce.hr/184822

Publication date:

18.7.2017.

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