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Composite Coatings with Drag Reduction and Self-Cleaning properties

机译：具有减阻和自洁性能的复合涂料

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Today, the efficiency of turbines is limited by different losses. Minimizing these losses is a main goal to reduce fuel consumption and produce more environmentally friendly machines. Observations on the scales of fast swimming sharks display a riblet structure. These riblets provide a significant reduction of drag losses, but are quite sensitive on pollution. Therefore, for a good performance, it is essential to combine these structures with self-cleaning properties. A lateral- and depth-selective distribution of particles with a negative thermal expansion coefficient (NTE) in a binder with positive thermal expansion coefficient can be used to deform the surfaces depending on the temperature. At high temperatures a riblet structure will be formed by local expansion or shrinkage and at cooling down the surface will be cleaned by the reversal of the deformation. Beside the production of a coating with a lateral- and depth-selective distribution of the NTE-ceramics within the binder the thermodynamical stability of the ceramics inside the binder is part of the investigations to provide a sufficient long-time stability of the coating.
机译：如今，涡轮机的效率受到各种损失的限制。减少这些损失是减少燃油消耗和生产更环保机器的主要目标。对快速游泳鲨鱼鳞片的观察显示出肋状结构。这些肋可显着减少阻力损失，但对污染非常敏感。因此，为了获得良好的性能，必须将这些结构与自清洁特性结合起来。具有正热膨胀系数的粘结剂中具有负热膨胀系数（NTE）的颗粒的横向和深度选择性分布可用于根据温度使表面变形。在高温下，将通过局部膨胀或收缩形成肋状结构，并且在冷却时，将通过变形的反向来清洁表面。除了生产粘合剂中NTE陶瓷具有横向和深度选择性分布的涂层外，粘合剂内部陶瓷的热力学稳定性是研究的一部分，目的是为涂层提供足够的长期稳定性。

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