Alumina is often used for electrical insulation. However, different material systems promise to increase the insulation due to their material characteristics. Because of the process properties including high cooling rates, thermally sprayed coatings generally differ from sintered material, which also effect the electrical properties. Within this study, different thermally sprayed coatings are analyzed via impedance spectroscopy to evaluate the capacitive and the electrical insulation behavior. Besides comparing the frequency-dependent resistance, equivalent circuit diagrams were used to calculate the relative permittivity of the coatings. X-ray diffractograms reveal the phase stability of the coatings during thermal spraying. X-ray diffraction was additionally conducted to classify the systems and the respective effects. In particular, the investigated mullite-based coatings exhibit slightly increased impedance values compared to conventionally used alumina-based coating systems.

氧化铝通常用于电绝缘。然而，不同的材料系统由于其材料特性而有望提高绝缘性。由于包括高冷却速率在内的工艺特性，热喷涂涂层通常不同于烧结材料，后者也会影响电性能。在这项研究中，通过阻抗谱分析不同的热喷涂涂层，以评估电容和电绝缘行为。除了比较与频率相关的电阻外，还使用等效电路图来计算涂层的相对介电常数。X 射线衍射图揭示了热喷涂过程中涂层的相稳定性。另外进行了 X 射线衍射以对系统和各自的影响进行分类。尤其，