Residual and Applied Stresses in Thermally Sprayed Metallic and Ceramic Coatings

In this paper, a four-point bending test is developed that makes it possible to load layers with defined tensile stresses. In the experiments, high-density stainless steel is applied using HVOF and ceramic layers are produced using water-stabilized plasma spraying. Both coating materials are then subjected to bend testing. The steel layers show a volume of elasticity twice that of the surface elasticity module, while in the ceramic layers, no surface tension was observed. This can be explained by the opening and closing of crack structures in the material. Paper includes a German-language abstract.