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镍的有色冶金中,Cu_2S—Ni_3S_2二元系是重要的平衡体系。有关Cu_2S—Ni_3S_2二元系相图前人所得结论均有差异。本文利用石英管淬火技术,差热分析,电子探针(EDX,WDX)等研究了Cu_2S—Ni_3S_2二元系的相平衡。研究认为Ni_3S_2在536℃时转变为高温相Ni_(3±x)S_2并在805±2℃时熔化。Cu_2S—Ni_3S_2二元系的共晶温度是740±5℃,共晶点成分为Cu_2S16Wt%、Ni_3S_284wt%。Ni_3S_2端存在固溶区,高温Ni_3S_2固溶铜3—6wt%,低温Ni_3S_2固溶铜0.6—1.5wt%。室温下Cu_2S固溶镍为1.2—3.6wt%。
Nickel non-ferrous metallurgy, Cu_2S-Ni_3S_2 binary system is an important equilibrium system. There are differences between the previous conclusions about the phase diagram of Cu_2S-Ni_3S_2 binary system. In this paper, the phase equilibrium of Cu_2S-Ni_3S_2 binary system was studied by means of quartz tube quenching, differential thermal analysis and electronic probe (EDX, WDX). It is considered that Ni_3S_2 is transformed into Ni_ (3 ± x) S_2 at 536 ℃ and melted at 805 ± 2 ℃. The eutectic temperature of Cu_2S-Ni_3S_2 binary system is 740 ± 5 ℃, and the composition of eutectic point is Cu_2S16Wt% and Ni_3S_284wt%. The solid solution zone exists at the side of Ni_3S_2, the high temperature Ni_3S_2 solid solution copper is 3-6wt%, and the low temperature Ni_3S_2 solid solution copper is 0.6-1.5wt%. Room temperature Cu_2S solid solution of nickel is 1.2-3.6wt%.