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| Abstract No.: |
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Scheduled at:
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Friday, May 06, 2022, Hall D 2:00 PM
Suspension Spraying II
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| Title: |
Surface preparation of aluminum for suspension plasma spray (SPS) coatings
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| Authors: |
Masiar Rahman* / Concordia University, Canada
C. Moreau / Concordia University, Canada
Jacopo Profili/ Laval University, Canada
Luc Stafford/ University of Montreal, Canada
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| Abstract: |
Surface preparation of materials is very important in industry. This is particularly true for adhesion of suspension plasma spray (SPS) coatings since these types of thin layers are designed to be used in harsh environments. In this work, surface preparation of aluminum substrates was performed by atmospheric pressure plasma jet (APPJ) to improve the adhesion strength of the SPS coatings. Aluminum (Al-2024) was selected as the substrate because of its high strength-to-weight ratio well adapted to the aerospace applications. The observed adhesion mechanisms of the APPJ-treated samples were compared to conventional grit blasting. Different surface treatment conditions were identified by using the APPJ technique revealing a completely new type of surface microstructure. The latter was characterized by SEM and EDX. Important surface topography parameters (roughness, skewness, kurtosis, etc.) were also evaluated by confocal microscopy. Afterwards, the prepared substrates were coated with alumina with a Mettech Axial (III) SPS system. The adhesion strength of the deposited alumina coatings was evaluated by the ASTM C-633 protocol for both grit-blasted and APPJ-treated substrates. Improved adhesion strength (2.4 factors higher) was achieved from the surface prepared by APPJ technique.
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