Transport properties and microstructure changes of alumina coatings characterized by emanation thermal analysis |
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Authors: | V Balek J Šubrt E Klosová M Beneš |
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Institution: | (1) Nuclear Research Institute Řež, plc., 25068 Řež, Czech Republic;(2) Research Center Řež, Ltd., 25068 Řež, Czech Republic;(3) Institute of Inorganic Chemistry, ASCR, 25068 Řež, Czech Republic |
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Abstract: | Emanation thermal analysis was used to characterize the thermal behaviour of alumina coatings as deposited on EUROFER 97 steel
surface by filtered vacuum arc technique. Temperature ranges of the healing of cracks and structure irregularities observed
by SEM were determined from the ETA results. Transport properties of the alumina coatings were assessed from the ETA results
by the evaluation of radon diffusion parameters in the temperature range from 50 to 300°C. Healing microstructure irregularities
of the alumina coatings can be expected in the range 300–700°C as indicated by the decrease of the radon release rate. From
the ETA results it followed that the onset of healing the cracks observed by the SEM on the surface of one alumina coating
sample can be expected at 430°C.
Dedicated to Dr. K. Habersberger, Past-Chairman of the thermal analysis working group of the Czech Chemcial Society, at the
occasion of his 75th birthday |
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Keywords: | alumina coatings emanation thermal analysis filtered vacuum arc technology microstructure changes radon diffusion |
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