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Thermodynamic analysis
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Proceedings Papers
Effect of TiO 2 and TiB 2 Compounds on the Microstructure and Infrared Emissivity of Spinel Ni-Cr Oxide Coatings Prepared by APS
Available to Purchase
ITSC2016, Thermal Spray 2016: Proceedings from the International Thermal Spray Conference, 1114-1119, May 10–12, 2016,
Abstract
View Papertitled, Effect of TiO 2 and TiB 2 Compounds on the Microstructure and Infrared Emissivity of Spinel Ni-Cr Oxide Coatings Prepared by APS
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for content titled, Effect of TiO 2 and TiB 2 Compounds on the Microstructure and Infrared Emissivity of Spinel Ni-Cr Oxide Coatings Prepared by APS
In this study, high-emissivity NiCr oxide coatings, one with TiO 2 and one with TiB 2 compounds, were deposited on stainless steel substrates by spray granulation and atmospheric plasma spraying. The main phases in both coatings are NiTiO 3 , spinel (NiCr 2 O 4 ), and residual Cr 2 O 3 . The emissivity of the layer with TiO 2 was found to be higher in the 2.5-8 μm range than that of the layer with TiB 2 , which is attributed to higher surface roughness and larger particle size. These results indicate that the NiCr oxide coatings with TiO 2 compounds are more suitable for high-temperature IR applications.
Proceedings Papers
Influence of Nozzle Design on the Structure of a Plasma Jet Under Vacuum Conditions
Available to Purchase
ITSC 2002, Thermal Spray 2002: Proceedings from the International Thermal Spray Conference, 938-943, March 4–6, 2002,
Abstract
View Papertitled, Influence of Nozzle Design on the Structure of a Plasma Jet Under Vacuum Conditions
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for content titled, Influence of Nozzle Design on the Structure of a Plasma Jet Under Vacuum Conditions
This paper presents a detailed numerical analysis that shows why Laval nozzles are used for vacuum plasma spraying and how to optimize their design to achieve a uniform plasma jet free of expansion waves under different spraying conditions. A Laval nozzle prototype is tested against a commercially available conical nozzle and is found to deliver a longer core jet with less turbulent scattering. Paper includes a German-language abstract.
