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1360 |
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Tuesday, June 03, 2008, Auditorium 2 3:50 PM Junior Session This session will deal with different topics, most promising young talents, both from industry and universities will report shortly about their work. This session is accompanied by a special poster exposition. All visitors of this session are allowed to elect their favorite contribution, the winner will be anounced on the awards banquet |
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Process maps for thermal spray: tailoring physical properties of TiO2 through understanding of particle state indicators |
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Jose Colmenares-Angulo* / Center for Thermal Spray Research,
Dept. of Materials Science & Engineering,
Stony Brook University, USA Valeria Cannillo / University of Modena and Reggio Emilia , Italy Sanjay Sampath/ Center for Thermal Spray Research, Stony Brook University, USA Atin Sharma/ Center for Thermal Spray Research, Stony Brook University, USA Andrew Gouldstone/ Center for Thermal Spray Research, Stony Brook University, USA |
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Titanium Dioxide coatings from anatase powder feedstock were sprayed over a wide range of conditions, i.e., temperature-velocity space. This was done by using four different torches ? F4 and Triplex (plasma) and Diamond Jet and HV2000 (HVOF). Temperature and Velocity were measured using DPV2000 and Accuraspray diagnostic equipment. Particle State indicators studied include Kinetic Energy, Reynolds Number and Melting Index. In the plasma case, powder injection was optimized and observed using Spraywatch diagnostic equipment with Hi-watch laser illumination accessory. The effect of such optimization in coating properties was analyzed. All coatings were characterized for electrical properties, microstructural features and phase content (X-ray diffraction, Differential Thermal Analysis). Splat Morphology was also analyzed. Combined experiments suggest a direct relationship between resistivity, coating oxidation state and particle molten state indicators. This relationship can be explained by understanding the influence of spray stream conditions on the oxygen vacancy state of the coatings. |