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| Abstract No.: |
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Scheduled at:
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Monday, May 03, 2010, Moor Room 11:10 AM
Plasma Spraying 1
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| Title: |
Yttria deposition by a novel plasma torch
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| Authors: |
Larry Pershin* / University of Toronto, Canada
Javad Mostaghimi / University of Toronto, Canada
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| Abstract: |
Carbon dioxide (CO2) and hydrocarbon (such as CH4) gas mixtures allow generate plasma with much higher enthalpy and thermal conductivity, leading to higher spray process efficiency and improved heat transfer to the sprayed particles. In this work, the DC plasma torch operating with CO2+CH4 gas mixture which has been developed at CACT (University of Toronto) was used to deposit coatings. Specifically, this study was focused on the effect of this plasma gas mixture on the particle parameters during plasma spraying of Yttria (Y2O3) powder. The torch input power varied in the range 25 to 45 kW. Measurements of the in-flight particle conditions were made by a DPV-2000 monitoring system.
Results demonstrate that the average particle temperature was T=2937 °C at spray distance of 50mm and T=2750 °C at distance 100 mm. The particulate plume scans show that the majority of the particles are overheated at a distance of 100 mm. Cross-sections through the sprayed coatings were polished and examined under a scanning electron microscope as well as XRD.
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