Authors: Christophe Lyphout Per Nylén Lars Östergren
Publish Date: 2010/09/02
Volume: 20, Issue: 1-2, Pages: 76-82
Abstract
Fundamental understanding of relationships between process parameters particle inflight characteristics and adhesion strength of HVOF sprayed coatings is important to achieve the high coating adhesion that is needed in aeronautic repair applications In this study statistical Design of Experiments DoE was used to identify the most important process parameters that influence adhesion strength of IN718 coatings sprayed on IN718 substrates Special attention was given to the parameters combustion ratio total gas mass flow standoff distance and external cooling since these parameters were assumed to have a significant influence on particle temperature and velocity Relationships between these parameters and coating microstructure were evaluated to fundamentally understand the relationships between process parameters and adhesion strengthThis article is an invited paper selected from presentations at the 2010 International Thermal Spray Conference and has been expanded from the original presentation It is simultaneously published in Thermal Spray Global Solutions for Future Applications Proceedings of the 2010 International Thermal Spray Conference Singapore May 35 2010 Basil R Marple Arvind Agarwal Margaret M Hyland YukChiu Lau ChangJiu Li Rogerio S Lima and Ghislain Montavon Ed ASM International Materials Park OH 2011The authors acknowledge the financial support of the VINNOVA funded NFFP4 project and the technical support of the Thermal Spray Department at Volvo Aero Corporation Trollhättan Sweden The authors would like to acknowledge J Johansson VAC for the DPV2000 acquisitions and H Dahlin and M Ottosson University West for their technical support in brazing experiments
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