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Ball valves
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Proceedings Papers
ITSC 2013, Thermal Spray 2013: Proceedings from the International Thermal Spray Conference, 712-716, May 13–15, 2013,
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This work deals with the selection and deposition of wear-resistant coatings for ball valves used in coal slurry pipelines. Several NiCrBSi and WC-CoCr powders were deposited on stainless steel substrates by various methods, including atmospheric plasma spraying (APS) with and without post-process fusion, plasma transferred arc (PTA) spraying, and high-velocity oxyfuel (HVOF). The HVOF deposits had very low porosity and uniform carbide distribution in the metallic matrix. WC-CoCr coatings obtained by HVOF spraying were dense and well-adhered and experienced the least amount of mass loss in wear testing. As a result, they were recommended for testing in coal-water slurry pipelines and continue to perform well after more than two years.
Proceedings Papers
ITSC2012, Thermal Spray 2012: Proceedings from the International Thermal Spray Conference, 172-177, May 21–24, 2012,
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This case study is the result of an investigation on HVOF Cr 3 C 2 -NiCr coating failure of on-off metal seated ball valve (MSBV) used in supercritical steam lines in a power plant and solution. HVOF Cr 3 C 2 -NiCr coating is used to protect thousands of MSBVs without incident. However, in this case the valves are challenged with exposure to rapid high pressure and temperature variation resulting in a unique situation where the coating experiences cracking and cohesive failure. A detailed investigation was undertaken by Velan, Kennametal Stellite, the National Research Council of Canada and the Ecole Polytechnique to determine possible failure cause and develop solutions in which highlights are presented.
Proceedings Papers
ITSC 2006, Thermal Spray 2006: Proceedings from the International Thermal Spray Conference, 769-774, May 15–18, 2006,
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Since its inception, the Office of Naval Research (ONR) program entitled, “Thermal Spray Processing of Nanostructured Coatings”, has produced numerous successes relating to military and industrial applications. Commercially available thermal spray processes have been used to apply ceramic coatings from nanostructured powders, producing dramatically improved wear performance over coatings from conventional non-nanostructured powder. The nanostructured alumina-titania coating has been instrumental in extending the life of a critical Navy need, the protection of the main propulsion shaft of mine countermeasures ships. The advancement in nanostructured oxide coatings has led to the development of the first industrial application of a thermal sprayed nanostructured coating. A nanostructured titanium oxide coating has been developed and successfully incorporated into severe-service ball valves used in hydrometallurgical extraction of gold, nickel, and cobalt. This paper will also present promising results from current development work relating to nanostructured coatings for thermal barrier, biomaterial, and reconditioning applications.