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3 October 1997 Hot corrosion resistance of laser-beam-remelted ceramic coatings
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The paper examines the influence of laser remelting of Al2O3-Ni and Al2O3-Ni+CrAl ceramic layers spread on creep-resisting alloy by plasma-spray processing, upon the quality of ceramic coatings which are the thermal barrier and high temperature corrosion protection of these alloys. It has been stated that laser beam scanning of 0.103 X 109 W/m2 power density ensures good quality of coatings at the beam shift rate equal 1 - 2 m/min. At smaller scanning rate, laser remelted ceramic layer spalls and chips. The examination of corrosion resistance in the medium of sulphur compounds has been carried out on plasma-sprayed samples which underwent chromoaluminizing and laser remelting. Diffusive chromoaluminizing and laser beam remelting proved advantageous for corrosion resistance of the alloy. An alloy without coating and with coating but without additional chromoaluminizing showed very low corrosion resistance in the medium of sulphur compounds.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Krystyna Kobylanska-Szkaradek and Lucjan Swadzba "Hot corrosion resistance of laser-beam-remelted ceramic coatings", Proc. SPIE 3187, Laser Technology V: Applications in Materials Sciences and Engineering, (3 October 1997);


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