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A parameter study of the Protal® Process to optimise the adhesion of Ni5Al Coatings
University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
University West, Department of Engineering Science, Division of Production Engineering.ORCID iD: 0000-0001-7787-5444
Sulzer Metco, Wohlen, Switzerland .
2004 (English)In: Thermal Spray 2004 : Advances in technology and applications: Proceedings of the International Thermal Spray Conference 10-12 May 2004, Osaka, Japan Thermal Spray 2004, 2004, p. 898-902Conference paper, Published paper (Refereed)
Abstract [en]

The Protal process combines surface preparation using a laser and thermal spraying in one production step. The laser preparation is based on a photomechanical reaction induced by the interaction between a laser of high instantaneous power and a polluted surface. The mechanism of bonding and the coating-substrate interface are then changed in comparison with grit blasting resulting in a significantly reduced substrate roughness. This study is aimed at finding the optimal Protal process parameters for the coating adhesion of a Ni5%Al sprayed on Ti6Al4V and IN718 alloys. The parameters investigated are laser beam intensity, the time delay between the laser impact and the spray impact, powder feed rate, substrate roughness and temperature. A test plan including these parameters is analysed by means of a fractional factorial design of experiment method. The adhesions of the coatings are measured using the ASTM C633 standard test. Data are analysed by a multiple linear regression model using a least squares fit. In addition, the coating/substrate interface is examined by optical and electron scanning microscopy (SEM) techniques as well as by Auger electron spectroscopy. Substrate roughness, substrate temperature and laser intensity are all shown to have a negative correlation with adhesion strength within the investigated range. Areas of diffusion are noticed at the coating/substrate interface.

Place, publisher, year, edition, pages
2004. p. 898-902
National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-139ISBN: 978-0-87170-809-0 (print)OAI: oai:DiVA.org:hv-139DiVA, id: diva2:211916
Conference
The International Thermal Spray Conference 10-12 May 2004, Osaka, Japan
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. p. 40
Series
Doktorsavhandlingar vid Chalmers tekniska högskola, ISSN 0346-718X ; 2637
Keywords
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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Nylén, Per

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