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Build-up mechanism of suspension plasma-sprayed alumina coatings deposited by WSP-H plasma torch.
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SYSNO ASEP 0484134 Document Type C - Proceedings Paper (int. conf.) R&D Document Type O - Ostatní Title Build-up mechanism of suspension plasma-sprayed alumina coatings deposited by WSP-H plasma torch. Author(s) Tesař, Tomáš (UFP-V) ORCID
Mušálek, Radek (UFP-V) RID, ORCID
Medřický, Jan (UFP-V) RIDSource Title SMT31 Conference Proceedings: International Conference on Surface Modification Technologies (SMT 31), Thermal Spray. - Mons : University of Mons, UMONS, 2017 - ISBN N Number of pages 8 s. Publication form Online - E Action SMT31: International Conference on Surface Modification Technologies 2017 Event date 05.07.2017 - 07.07.2017 VEvent location Mons Country BE - Belgium Event type WRD Language eng - English Country BE - Belgium Keywords suspension plasma spraying ; microstructure ; build-up ; alumina ; splat Subject RIV JK - Corrosion ; Surface Treatment of Materials OECD category Coating and films R&D Projects GA15-12145S GA ČR - Czech Science Foundation (CSF) Institutional support UFP-V - RVO:61389021 Annotation Suspension plasma spraying is a modification of the conventional plasma spraying, where dry coarse powder is replaced by suspension of fine powder. SPS method benefits from using of high enthalpy plasma torches, since additional heat is necessary to evaporate the liquid carrier. This paper elucidates the growth mechanisms of the suspension plasma sprayed coatings prepared by high enthalpy WSP-H plasma torch. Two alumina suspensions with different formulation were sprayed to demonstrate different build-up mechanisms of the coatings with typical “cauliflower-like” and dense microstructures. Splat formation, particle trajectory divergence, and spray beads were investigated and it was demonstrated that the mutual sample-torch position also strongly influences the character of the coating. Moreover, it was observed that cauliflower-like columnar structure may be, developed also on smooth surfaces and the typical column diameter is directly connected to the thickness of the coating. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2018
Number of the records: 1