Abstract Slurry erosion is one of the primary reasons for performance decrement of hydropower turbines; Therefore, the present study investigates the slurry erosion performance of high velocity flame sprayed (HVFS) nickel matrix base coating compositions in which multi-dimensional sized (submicron, and nanostructured) TiO2, and Al2O3 ceramic particles were added as reinforcement. The experiments were carried out using a non-recirculating jet type slurry erosion test rig. The potential effect of influential parameters such as impact velocity, slurry concentration, and average particle size were also estimated under different erosive conditions. The results showed that the as-sprayed Ni-40TiO2 coating exhibited the highest slurry erosion resistance than Ni-20TiO2-20Al2O3 coating and uncoated steel specimens. Further, the eroded surface of uncoated steel and Ni-40TiO2 coating showed mixed behaviour (ductile and brittle) and Ni-20TiO2-20Al2O3 coating exhibited brittle behaviour as the mechanism of material removal.

中文翻译：

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浆液侵蚀下高速火焰喷涂多维Ni-TiO2和Ni-TiO2-Al2O3涂层水轮机钢的性能研究

摘要 泥浆侵蚀是水轮机性能下降的主要原因之一；因此，本研究调查了高速火焰喷涂 (HVFS) 镍基涂层组合物的浆料侵蚀性能，其中添加了多维尺寸（亚微米和纳米结构）TiO2 和 Al2O3 陶瓷颗粒作为增强剂。使用非循环射流型泥浆侵蚀试验台进行实验。在不同的侵蚀条件下，还评估了冲击速度、浆液浓度和平均粒度等影响参数的潜在影响。结果表明，喷涂后的 Ni-40TiO2 涂层表现出比 Ni-20TiO2-20Al2O3 涂层和未涂层​​钢试样最高的耐浆料侵蚀性。更多，