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| Abstract No.: |
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Scheduled at:
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Thursday, June 08, 2017, Hall 27 3:00 PM
Pre- & Post-Treatment
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| Title: |
Understanding the infiltration behavior of sealers into thermally-sprayed coatings
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| Authors: |
Martin Andreas Knoch* / RWTH Aachen University, Germany
Kirsten Bobzin / Surface Engineering Institute, RWTH Aachen University, Aachen
Mehmet Öte/ Surface Engineering Institute, RWTH Aachen University, Germany
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| Abstract: |
Sealants are widely used in order to enhance the performance of porous thermally sprayed coatings, e.g. for electrical insulation or corrosion protection. In order to accomplish required properties, a good infiltration is necessary. The methods to assess the success of a sealing often rely on determining the infiltration depth by SEM or adding colour pigments to the sealer. In this study a new approach for assessing the success of a sealing operation is investigated. The underlying assumption is that porous coatings are not gas-tight and by sealing them, the measurable gas flow can be reduced. Therefore, the success of a sealing operation may be assessed by comparing gas flows at defined conditions prior and subsequent to sealing. This hypothesis is investigated by coating special highly porous substrates with a wide range of coating porosities and thicknesses, sealing these coatings, comparing nitrogen flows at a defined pressure prior and subsequent to the sealing operation and correlating the measured changes of nitrogen flow with traditionally assessed infiltration depth and filling degree. Besides investigating this innovative measurement method, the interaction between coating and sealer properties with respect to the resulting infiltration depth and filling degree is investigated as well.
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