Thermisches Spritzen von PTA-Werkstoffsystemen

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In many industrial applications, HVOF-sprayed cermet coatings are used for the protection from abrasive or erosive wear stress. In the recycling of steelwork dusts by briquetting, a number of parts work under thermal, abrasive, erosive and mechanical loads which are typically combined. To enable reliable service of thermally sprayed coatings under these conditions, a maximum toler-ance towards mechanical loads must be provided by means of optimised coating adhesion. Fur-thermore, resistance against abrasives or erosives under oxidising atmospheres at elevated tem-peratures has to be ensured. Thus, the main goal is an increase in coating bond strength under the described conditions and therefore an increased damage tolerance to avoid spalling of the coating after local overstress. The application of multilayer coatings by using spray parameters that are op-timised regarding the coating residual stresses is one possible way. Additionally, enhanced adhe-sion at the inner boundaries of the coating system shall be induced by pre-annealing at working temperature under unstressed conditions.