由低温无水电解稀土夹杂物和固体电解质定氧活度测得Ni液中钇的脱硫氧常数与温度的关系:lgKr_2o_2s=-(33146)/T+3.85,(1500-1600℃)钇的硫氧化物在Ni液中的标准生成自由能与温度的关系:2[Y]+2[O]+[S]=Y_2O_2S_(s),(1500—1600℃)△G°=151640+17.61T(cal/mol)=-634460+73.69T(J/mol)由实验测得数据经热力学分析计算得到1600℃Ni液中[Y]-[S]-[O]平衡立体图及α_o-α_s平衡相图,为理论上预测夹杂物生成的先后次序及类型提供了依据.并给出了Ni液中加钇控制夹杂物形态公式,钇的加入量与氧,硫含量之间的函数关系.
The deoxysulphurization constant of Y and Y oxysulphide standard free energyof formation vs temperature have been determined in liquid Ni.(?)(?)After calculation by thermodynamic analysis,it was resulted that the equilibriumspace diagram for[Y]-[S]-[O]system and a_O-a_S equilibrium phase diagram in liquidNi are presented.Thus,the subsequence and type of the inclusion formation maybe predicted by them.And the formula controlling the morphology of inclusionformed in liquid Ni by Y addition,as well as the relationship between the Y ad-dition and the content of O_2 and S are also given.
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