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| Abstract No.: |
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Scheduled at:
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Thursday, May 22, 2014, Hall A 11:40 AM
HVOF- / HVAF-Spraying
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| Title: |
Optimization of gritblasting conditions by supersonic air spraying
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| Authors: |
Christophe Lyphout* / University West, Sweden
Paolo Boccaccio/ University of Modena and Reggio Emilia, Italy
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| Abstract: |
Recent development of the HVAF-M3 system attracts a lot of interest in spraying Cr3C2-based materials as an economic, environmental and practical alternative to Electrolytic Hard Chrome (EHC) method, which is still widely utilized in the printing, automotive and off-shore industries. The use of compressed air instead of pure oxygen and the fact that gritblasting procedure can be operated with the HVAF gun itself offers economic advantages well perceived by the industry. A dedicated Design of Experiments on gritblasting parameters operated utilizing the HVAF-M3 system is proposed in the present work. Relationships between grit sizes - feed rate offset stand-off distance, and substrate roughness profiles, residual stresses and grit residues have been investigated. Additionally Cr3C2-based material has been HVAF-sprayed in order to study the influence of gritblasted conditions on the coating adhesion strength. Respective coating microstructure and adhesion strength are presented and discussed for further optimization of coating performances.
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