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有关Ni-Zr二元系中化合物NiZr和NiZr2之间的共晶温度,在热力学计算结果和实验数据之间存在较大差异,对此本文进行了针对性实验测定。利用氩气保护电弧熔炼,在NiZr和NiZr2成分范围内,制备了65wt%、68wt%、72wt%和74wt%Zr的Ni-Zr合金。选用商用氧化铝坩埚和自制氧化锆坩埚,以不同加热速率分别进行了差示扫描量热(DSC)测量,最终确定该共晶温度为1022±5℃。同时对实验合金与坩埚的反应情况进行了热力学分析,证实在测量温度范围内(<1100℃)采用氧化铝坩埚进行相关实验的适用性;在1170℃,氧化锆本身存在由单斜向四方的同素异构转变,氧化锆坩埚适用于该温度以下含锆合金的相平衡与热力学测量。
The eutectic temperature between the NiZr and NiZr2 compounds in the Ni-Zr binary system is quite different between the thermodynamic calculation results and the experimental data. In this paper, the specific experimental determination was carried out. Ni-Zr alloys of 65 wt%, 68 wt%, 72 wt% and 74 wt% Zr were prepared in the NiZr and NiZr2 compositions using argon arc protection. The commercial alumina crucibles and self-made zirconia crucibles were respectively measured by differential scanning calorimetry (DSC) at different heating rates. The final eutectic temperature was 1022 ± 5 ℃. At the same time, the thermodynamic analysis of the reaction between the experimental alloy and the crucible was carried out. The applicability of the experiment with alumina crucible in the measurement temperature range (<1100 ℃) was verified. At 1170 ℃, Allotropic transformation, zirconia crucible for the temperature below the zirconium alloy phase equilibrium and thermodynamic measurements.