Comparison of the properties NiCrBSi coating remelted by an electron beam with different deflection techniques
The thermal post treatment can increase the mechanical properties of some of thermally sprayed coatings. The NiCrBSi alloy profits from remelting of the previously sprayed coating. The electron beam technology allows a good process control and the treatment results also depend on the selected EB deflection. Four deflection techniques were tested – 6 points, line, field and meander. The remelting reduces the porosity and creates three structural zones with a different chemical compositions and hardness. The deflection technique influences the risk of cracking and the proportion of the individual structural zones. Remelting reduces the surface roughness and increases the wear resistance.