The development of novel designs for hydropower plants is of high interest nowadays. Studies have shown the negative effect of fluid flow on the turbines of mini-hydropower plants when using them in the conditions of the mountain river. To reduce the damage caused by cavitation, a microplasma coating technique has been chosen. Due to its wetting ability, low density, high thermal conductivity, high heat resistance and low chemical activity, graphite has been studied as a coating material. Vanadium pentoxide has been added as an interlayer to increase the wear resistance, corrosion resistance, and adhesion of the system. The microstructure of the system was studied using scanning electron microscopy and transmission electron microscopy. Functional properties of the system were tested by microhardness tests, wear resistance tests (friction), corrosion tests, and pull-off tests. The surface of the coating was homogeneous without warping, swelling and cracking. The microstructure consisted of regular structures in the form of branches of dendrites. V₂O₅/C coating resulted in the increase in microhardness up to 2534 MPa. The wear resistance (volume loss) of the sample with double-layer coating was 0.14 mm³ and the maximum adhesion strength was 17.5 MPa. Thus, the double-layer microplasma V₂O₅/C coating was applied and studied for strengthening the blades of mini-HPP. The microplasma method can find application in modifying the surface of power equipment subjected to the cavitation effect of the river water.

中文翻译：

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微型水电系统零件的等离子喷涂V2O5 / C双层涂层

如今，水力发电厂的新颖设计的开发备受关注。研究表明，在山区河流条件下使用时，流体流量对小型水力发电厂的涡轮机具有负面影响。为了减少由气蚀引起的损害，已经选择了微等离子体涂覆技术。由于其润湿性，低密度，高导热率，高耐热性和低化学活性，已经研究了石墨作为涂料。已添加五氧化二钒作为中间层，以提高系统的耐磨性，耐腐蚀性和附着力。使用扫描电子显微镜和透射电子显微镜研究了系统的微观结构。该系统的功能特性通过显微硬度测试，耐磨性测试（摩擦），腐蚀测试和拉拔测试。涂层表面是均匀的，没有翘曲，溶胀和开裂。微观结构由树枝状分支形式的规则结构组成。V₂ O ₅ / C涂层导致显微硬度提高到2534 MPa。具有双层涂层的样品的耐磨性（体积损失）为0.14mm ³，并且最大粘附强度为17.5MPa。因此，应用了双层微等离子体V ₂ O ₅ / C涂层并研究了如何增强mini-HPP叶片的性能。微等离子体方法可以发现在受到河水汽蚀作用的动力设备表面改性中的应用。