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我国黄河含砂量占世界各河流的首位。座落在黄河上的各水电站,因泥砂磨损与汽蚀的破坏有时被迫停机,每年少发电近十亿度,估计损失10～20亿元。 金属陶瓷具有良好的抗磨蚀性,且有可焊性,这些特性构成了可能在水轮机上用作耐磨蚀材料的条件。有多种陶瓷材料硬度高于长石、石英砂,但很难把它牢固地与母材连接成一体。而合金材料有好的可焊性,但硬度都很低,经不住高硬度泥砂颗粒的磨损。有机抗磨材料则往往由于汽蚀的强大破坏力使它们脱落。作者配制了一种硬度高、抗汽蚀性能好而又容易焊接的金属陶瓷片,用钎焊工艺贴在800kw水轮机叶片上,在泥砂含量与黄河
China’s Yellow River sand accounts for the first place in the world’s rivers. Hydropower stations located on the Yellow River are sometimes forced to shut down due to the erosion of sand and cavitation. Nearly one billion kilowatt-hours of electricity are generated each year, with an estimated loss of 10-2 billion yuan. Cermet has good resistance to abrasion and solderability, and these properties constitute a condition that can be used as a wear-resistant material on a turbine. A variety of ceramic materials hardness than feldspar, quartz sand, but it is difficult to firmly connected with the base material into one. The alloy material has good solderability, but the hardness is very low, can not withstand the wear and tear of high hardness sand particles. Organic anti-wear materials often fall off due to the powerful destructive power of cavitation. The author prepared a high hardness, cavitation erosion resistance and easy to weld metal ceramic tiles, with brazing process attached to the turbine blade 800kw, the sand content and the Yellow River