In the graded structure, the material, which has a higher coefficient of thermal expansion and good strength (YSZ), is applied in areas where high thermal stresses occur and where crack growth reaches critical values. A material with outstanding high temperature stability was used on the outer surface, where the temperatures during use can exceed the maximum temperatures for long-term use of YSZ. This article describes the manufacturing process of these structures by plasma spraying with a double injector system. The microstructure of these layers is described in detail. Thermal cycling tests with surface temperatures above 1200 deg C are carried out on these graded and stepped WDS systems. The results indicate a considerable increase in service life compared to the non-graded structures, which leads to the conclusion that this concept is well suited for the application. Paper includes a German-language abstract.

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