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Ni-Co 高温合金广泛用于生产燃气涡轮机叶片和热交换器等工作于高温和腐蚀环境的零部件,采用改良静滴法测定了 1773~1873 K 温度范围内熔融 Ni,Ni-(5~10)%Co 合金在 Al2O3 基板上 Ar+3%H2 气氛下的表面张力。熔融 Ni,Ni-(5~10)%Co 合金的表面张力随着温度的升高而降低。在此基础上采用 Butler 模型推导了表面张力随温度与浓度的变化,计算了合金体系中元素的偏聚。结果表明,Co 在合金表面的浓度低于在体相的浓度。
Ni-Co superalloy is widely used in the production of parts such as gas turbine blades and heat exchangers working in high temperature and corrosive environments. The Ni-Ni alloy is melted in the temperature range of 1773K to 1873K by the modified method. ) Surface tension of% Co alloy on Ar 2 + H 2 atmosphere on an Al 2 O 3 substrate. The surface tension of molten Ni and Ni- (5-10%) Co alloy decreases with the increase of temperature. On this basis, the variation of surface tension with temperature and concentration was deduced by the Butler model, and the segregation of elements in the alloy system was calculated. The results show that the concentration of Co on the alloy surface is lower than the concentration in the bulk.