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4769 |
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Tuesday, May 10, 2016, Auditorium 4:20 PM Young Professionals Session |
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Spray parameter effect on HVAF sprayed chromium carbide based hardmetal coatings |
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Ville Matikainen* / Tampere University of Technology, Finland Khashayar Khanlari/ Tampere University of Technology, Finland Andrea Milanti/ Tampere University of Technology, Finland Heli Koivuluoto/ Tampere University of Technology, Finland Petri Vuoristo/ Tampere University of Technology, Finland |
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Thermal spray processes are known for their complexity and the numerous variables that affect the resulting coating properties. Systematic study of the main spray parameters is an often used method to determine the process operation window. The design of experiments approach was employed to map the selected main parameters of a high velocity air-fuel (HVAF) spray process. Commercial chromium carbide based material with NiCrFeSi matrix was sprayed with varying gas flow parameters and nozzle designs. The effect of these variables on coating build up and properties were analyzed with a scanning electron microscope and x-ray diffraction methods. Also, abrasive wear and ball-on-disk tests were carried out to determine the wear resistance and tribological properties of the coatings. The study shows that sufficient heating is critical for the abrasion wear resistance of the studied material. The highest wear resistance was achieved with high fuel flow rates and with cylindrical or slightly expanding nozzle design. |