Plasma spraying of self-fluxing alloys with a remote arc with melting of the coating

Abstract

One of the most advanced and efficient methods of increasing the service life of machine components and mechanisms is the deposition of hardening coatings on the working surfaces. The coatings of nickel-based self-fluxing alloys deposited by plasma spraying are used widely in various branches of engineering. The properties and bonding strength of plasma coatings produced from nickel-based self-fluxing alloys can be improved by melting the surface layer at a specific temperature. In this work, the authors propose a method of calculating the depth of penetration in spraying the coatings of self-fluxing alloys with a remote arc taking into account the changes of the heat conductivity of the material which depends on porosity and temperature. The experimental results are used to determine the values of the heat conductivity coefficient for the nickel-based self-fluxing alloys. The dependence can be used for the more accurate selection of the power of the remote arc. The difference between the calculated and experimental values is smaller than 10%.

Keywords:

• Self-fluxing alloy
• nickel
• plasma coating
• coating
• heat conductivity factor
• remote arc
• cohesive resistance
• fusion

Notes

Selected from Svarochnoe Proizvodstvo, 2016 69(10) 22–25.