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On-Line Measurement of Plasma-Sprayed Ni-Particles during Impact on a Ti-Surface: influence of Surface Oxidation
University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.ORCID iD: 0000-0001-7787-5444
2007 (English)In: Journal of thermal spray technology (Print), ISSN 1059-9630, E-ISSN 1544-1016, Vol. 16, no 4, 506-511 p.Article in journal (Refereed) Published
Abstract [en]

The objective of this study was to analyze the impact of plasma-sprayed Ni5%Al particles on polished and grit-blasted Ti6Al4V samples under oxidized and nonoxidized conditions. For this purpose, measurements of thermal radiation and velocity of individual plasma-sprayed particles were carried out. From the thermal radiation at impact, splat diameter during flattening and temperature evolution during cooling were evaluated. Characteristic parameters related to the quality of contact between the splat and the substrate were retrieved. The flattening speed was introduced to characterize wetting, while the cooling rate was used to characterize solidification. The idea was to get a signature of particle impact for a given surface roughness and oxidation state by identifying parameters which strongly affect the splat behavior. Sieved Ni5%Al powder in a narrow range (+65 −75 μm) was sprayed on four sets of titanium alloy surfaces, consisting of polished and grit-blasted samples, one set had a nonoxidized surface and the other one was oxidized in an oven at 600 °C for two hours. Resulting splats after impact were characterized by scanning electron microscopy, the splats on oxidized surface showed pores in their core and detached fingers at the periphery. The cooling rate and flattening degree significantly increased on the oxidized smooth surface compared to the nonoxidized one. This trend was not found in grit-blasted surfaces, which implies that impact phenomena are different on grit-blasted surfaces than on smooth surfaces thus further work is needed.

Place, publisher, year, edition, pages
2007. Vol. 16, no 4, 506-511 p.
Keyword [en]
Coating-substrate interaction plasma spray forming roughness effects splats cooling
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-145OAI: oai:DiVA.org:hv-145DiVA: diva2:211932
Available from: 2009-04-20 Created: 2009-04-20 Last updated: 2016-02-12Bibliographically approved
In thesis
1. A study of the adhesion strength of plasma sprayed coatings
Open this publication in new window or tab >>A study of the adhesion strength of plasma sprayed coatings
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Göteborg: Chalmers University of Technology, 2007. 40 p.
Series
Doktorsavhandlingar vid Chalmers tekniska högskola, ISSN 0346-718X ; 2637
Keyword
Grit blasting, Thermal spraying, Coating, Surface pre-treatment, Surface roughness, Fractal analysis, Adhesion strength, Mechanical anchoring, Protal® process, Splat
National Category
Production Engineering, Human Work Science and Ergonomics Metallurgy and Metallic Materials
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
urn:nbn:se:hv:diva-163 (URN)
Public defence
(English)
Note
Delad utgivning: Trollhättan : Department of Technology, Mathematics and Computer Science, University WestAvailable from: 2009-04-21 Created: 2009-04-21 Last updated: 2010-01-08Bibliographically approved

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