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| Abstract No.: |
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| Title: |
The possibility of using ultrasonic waves to support suspension plasma spraying process
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| Authors: |
Pawel Sokolowski* / Wroclaw University of Science and Technology, Poland
Stefan Kozerski/ Wroclaw University of Technology, Poland
Marcin Korzeniowski/ Wroclaw University of Technology, Poland
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| Abstract: |
Suspension Plasma Spraying is one of the newest thermal spray processes. It uses liquid feedstock instead of dry powder as in case of conventional Powder Plasma Spraying. The most important advantage of this process is the possibility to use fine powders influencing deposition of finely-grained coatings. But for each powder material the suspension preparation process should be optimized first. This can bring many problems in terms of poor suspension stabilization, high viscosity or fast sedimentation. In this studies the possibility of using ultrasonic waves to support the feeding and injection of suspension was investigated. The in-line ultrasonic system for a breaking of powder agglomerates in a pipeline system as well as ultrasonic system for suspension injection were designed and tested. The studies were followed by shadowgraphy that enabled to observe formulation of suspension droplets in the plasma jet. Finally, the microstructural characterization of deposited coatings was performed also by Scanning Electron Microscopy (SEM).
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