Department of Mechanical engineering
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Item Modification in Powder Feeder for Nano-Powder for Thermal Spray Thin Coatings(ASM International, 2016-05) Shrivastava, SharadThis paper discusses the modification of powder feeders to facilitate the deposition of nano materials by thermal spraying without the use of a suspension or solution precursor. Two powder feeder designs were developed and used to deposit nanocarbide coatings by HVOF spraying. The nano coatings were examined and tested, and the results are presented and discussed.Item High performance thermal-sprayed WC-10Co-4Cr coatings in narrow and complex areas(Taylor & Francis, 2017-09) Shrivastava, SharadA complex geometry is always a challenge for the thermal spray community, because the spray angle affects the droplet’s impact on the substrate resulting in changes in coating properties. In this work, an attempt has been made to overcome this limitation. WC-Co-Cr coating was deposited on the CA6NM steel using newly developed high-velocity oxy liquid fuel (HVOLF) thermal spraying gun. As-sprayed coatings were analysed using x-ray diffraction, scanning electron microscopy for phase and microstructural analysis, respectively. Coating microhardness and porosity were also measured. Adhesion strength tests were conducted to determine the mechanical properties of the as-sprayed coatings. Results show that the coating produced by the HVOLF thermal spray system is excellent in terms of mechanical properties achieved. The angular design of this gun allows spraying in narrow areas, complex parts and inside internal diameter minimum as 140 mm having almost uniform coating properties at both spray angles (45° and 70°); this makes it a promising solution for coating deposition on complex geometries.