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| Abstract No.: |
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Scheduled at:
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Wednesday, June 04, 2008, Room 04 11:20 AM
Gasturbines 4
Coatings for mobile and stationary turbines, protection against wear, high temperature corrosion and thermal stresses, clearance control coatings for a better efficiency
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| Title: |
PTA processing of ceramic coatings
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| Authors: |
Ana Sofia d'Oliveira* / Federal University of Paraná - UFPR, Brazil
Fabiano Drozda / Multibras, Brazil
Edson Takano/ Federal University of Paraná-UFPR, Brazil
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| Abstract: |
Welding of dissimilar materials in particular ceramics to metals is a technical challenge with attractive economical consequences. In this work a ceramic coating was processed by plasma transferred arc. ZrO2Y2O3 powders were deposited on two Ni based alloys (NiCrMo and NiCrAlY) layers previously welded on a steel plate. Coatings were evaluated regarding their soundness and by optical microscopy on the transverse section. Results showed that the pair ZrO2Y2O3/substrate material played the major role on the quality of the processed surfaces, determining the effectiveness of the bonding. Processing on the NiCrAlY layers leading to 3mm thickness coatings. Deposits exhibited transverse cracks which were reduced with a stress relief at 400ºC of the substrate (AISI 1020+NiCrAlY layer) prior to deposition. Transverse section analysis confirmed the bonding between the substrate and coating materials and revealed the presence of micro-cracks and a morphology of the ZrO2Y2O3 similar to that reported on Plasma spray deposits.
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