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| Abstract No.: |
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Scheduled at:
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Wednesday, June 04, 2008, Room 04 4:00 PM
Nanomaterials 2
Most coating materials gain superior coating performance when applied as nanostructured coating, new designed materials and optimized processes show promising results for this
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| Title: |
Axial injection plasma spraying using micro- and nanopowder slurries
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| Authors: |
Zhaolin Tang* / Northwest Mettech Corp., Canada
Zhaolin Tang / Northwest Mettech Corp., Canada
Alan Burgess/ Northwest Mettech Corp., Canada
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| Abstract: |
Atmospheric plasma spraying (APS) was successfully applied for Thermal Barrier Coatings (TBCs), which possesses a lamellar structure with a porosity of 5-20 %. It presents a big challenge to control the plasma process to achieve fully dense coatings as required for some emerging applications such as solid oxide fuel cells (SOFCs) and dense TBCs. If finer powders are used, it produces finer lamellae, resulting in denser coatings. However, powders finer than 10 microns are very difficult to feed consistently into plasma. The use of slurry is a potential solution to carry fine particles. In this paper, an automatic slurry feed system were developed to consistently deliver micro and nano powder slurries. The slurries were injected axially into high energy/high velocity plasma to generate dense coatings. The effects of plasma parameters and different feedstocks on coating microstructures are investigated and dense coatings for various applications were demonstrated.
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