Abstract
The article presents selected results of testing Ni-Cr-Re coatings deposited by means of HVOF supersonic spray. The substrate made of 16Mo3 chromium molybdenum boiler steel was sprayed with a powder material of Oerlikon Amdry 4535 80% Ni, 20% Cr, 20÷45 μm, to which 1% of metallic rhenium was added using the high energy milling method in a ball mill. The Rhenium is an alloying additive that improves the heat resistance of alloys, creep and high temperature oxidation resistance. Alloys with the addition of rhenium are widely used in the aerospace industry (nickel superalloys) and in power industry. Metallographic microscopic examinations, microhardness tests and surface profilometry were carried out.
Highlights
HVOF (High Velocity Oxy Fuel) supersonic flame spraying consists of bombarding the substrate with a stream of coating material molecules at very high velocities, in the order of 400÷1300 m/s, which due to the collision with the ground undergo high plasticization
The HVOF supersonic flame spraying process offers a wide range of application possibilities
Very few restrictions apply to the substrate, the condition is to prepare the surface to achieve maximum adhesion of the coating
Summary
HVOF (High Velocity Oxy Fuel) supersonic flame spraying consists of bombarding the substrate with a stream of coating material molecules at very high velocities, in the order of 400÷1300 m/s, which due to the collision with the ground undergo high plasticization. It is enabled by dynamic reaction of burning liquid fuel or gaseous fuel (hydrogen, methane, kerosene) with oxygen, where the flame temperature reaches 2500÷3000 °C. The combustion heat of the fuel causes a strong plasticization of the powder particles, but they do not become liquefied Their residence time in the flame zone is very short, this is due to the very high flow velocity characteristic of the HVOF process.
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