Surface contamination of alumina ceramics by carbon

Authors

  • 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

Keywords:

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

Abstract

This 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.

Author Biographies

Stoja Rešković, University of Zagreb Faculty of Metallurgy

department of mechanical metallurgy, assoc.prof.

Tin Brlić, University of Zagreb Faculty of Metallurgy

department of mechanical metallurgy, student

Suzana Jakovljević, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture

department for materials, assis. prof.

Ivan Jandrlić, University of Zagreb Faculty of Metallurgy

department of mechanical metallurgy, PhD.

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Published

2017-07-18

Issue

Engineering Review, Vol. 37, No. 3

Section

Articles

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