High Velocity Oxy-Fuel (HVOF) spray techniques can produce high performance alloy
and cermet coatings for applications that require wear resistant surfaces. In HVOF
spraying heat is produced by burning mixtures of oxygen and fuel, mainly hydrogen,
kerosene, propane, propylene, natural gas or acetylene. In these processes, the particle
velocity and temperature determine the resultant coating properties and in many cases
enables a better understanding of the process.
The aim of this study is to investigate influences of different oxygen/fuel ratios on
velocity and temperature of flying particles as well as properties of the HVOF thermal
sprayed WC-CoCr coatings. In this work the feedstock powders were thermally sprayed
by two different variants of the high velocity oxy-fuel process, in which the fuels were
hydrogen and kerosene.
Particle parameters were recorded just prior to impact on the substrate using in-flight
particle diagnostic tool Accuraspray-g3®. Detailed correlation of particle parameters
and the coating properties is evaluated in order to deduce particle parameter ranges
providing coatings with optimum properties.
CitacióPicas, J.A. [et al.]. Effect of oxygen/fuel ratio on the in-flight particle parameters and properties of HVOF WC–CoCr coatings. A: 12th International Conference on Plasma Surface Engineering. "12". Garmisch-Partenkirchen: 2010, p. 367.