采用改进静滴法测定了1773～1873 K温度范围内熔融Ni-(5～10)W(质量分数,%)合金在Al2O3基板上于Ar+3%H2气氛下的表面张力数据.熔融Ni-W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情况,计算了合金体系中元素的偏聚情况.表面张力的计算结果与测量值的符合度较高.W在合金表面的浓度低于体相浓度.
Surface tension of molten Ni-(5～10)W (mass fraction,%)alloys was measured at the temperature range of 1773～1873 K using an improved sessile drop method with an alumina substrate in an Ar+3%H2 atmosphere.The surface tension of molten Ni-W alloys decreases with increasing of temperature.On the basis of experimental data,the surface tension of molten Ni-W alloys was also theoretically deduced both as functions of concentration and temperature using a model of Butler's equation.The surface segregation in Ni-W system was calculated.The measured results agree well with a model for the surface tension.The surface concentration oftungsten is lower than that in bulk.
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