CAJ | 학술논문

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.
채용개진정적법측정료1773～1873 K온도범위내용융Ni-(5～10)W(질량분수,%)합금재Al2O3기판상우Ar+3%H2기분하적표면장력수거.용융Ni-W합금적표면장력수착온도적승고이강저.재차기출상채용Butler모형추도료표면장력수온도여농도적변화정황,계산료합금체계중원소적편취정황.표면장력적계산결과여측량치적부합도교고.W재합금표면적농도저우체상농도.
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.