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| Abstract No.: |
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| Title: |
Comparison of corrosion resistance and oxides morphology of NiCrAlY plasma sprayed coating and sintered alloy
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| Authors: |
Dawid Niemiec / Silesian University of Technology, Poland
Grzegorz Moskal/ Silesian University of Technology, Institute of Materials Science, Poland
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| Abstract: |
The basic aim of presented article is related with comparison of internal morphology of atmospheric plasma sprayed NiCrAlY coating and sintered alloy obtained from the same feedstock powder. This part of investigations consisted characterization of phases composition and internal morphology characterization by SEM/EDS and EBSD method.
The second level of this comparing process is characterization of oxidation mechanism in both cases. In order to properly perform these tests the top surfaces of sintered sample was sand blasted to the roughness level adequate to surface condition after plasma spraying process. After this treatment both surfaces were characterized by optical profilometry and theirs surfaces were described quantitatively and qualitatively.
The oxidation tests were performed at temperature 900, 1000 and 1100°C during the time to 1000h of exposure. The specimens after determined intervals were mowing out from the surfaces and characterized by visual inspection, characterization of top surface by SEM/EDS method as well as by XRD analysis to characterization of phases generated during oxidation. The special emphasis was took on the characterization of oxides zone on cross sectioned samples where detailed assessment of oxides zone morphology was made by SEM/EDS and EBSD method. The oxide thickness was measured as well with dividing of overall oxides zone thickness on the sublayers related with alumina and spinels formation.
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