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采用真空电弧熔炼工艺制备了Cu-Ni-Nb合金,研究了Nb含量对Cu-Ni-Nb合金组织、合金熔点及热导率的影响。结果表明,Cu-Ni-Nb合金基体为Cu0.81Ni0.19,第二相为NbNi3;当Ni、Nb质量比为(6~10)∶1时,Cu-Ni-Nb合金第二相形态全部为片状;当Ni、Nb质量比为(2~4)∶1时,Cu-Ni-Nb合金第二相为片状和球状。随着Nb含量的增加,Cu-NiNb合金基体中Ni原子固溶度降低,合金熔点下降,而热导率提高。Cu-20Ni-5Nb合金第二相为细小的片状和球状,均匀分布在基体中,第二相体积分数为19.2%,合金熔点为1 134.92℃,热导率为45.25 W/(m·K),可满足铸Cu冷却水套的制造和使用要求。
The Cu-Ni-Nb alloy was prepared by vacuum arc melting process. The effect of Nb content on microstructure and melting point and thermal conductivity of Cu-Ni-Nb alloy was studied. The results show that the matrix of Cu-Ni-Nb alloy is Cu0.81Ni0.19 and the second phase is NbNi3. When the mass ratio of Ni and Nb is (6-10): 1, the morphology of the second phase of Cu-Ni-Nb alloy Is flake; when Ni, Nb mass ratio (2 ~ 4): 1, Cu-Ni-Nb alloy second phase is flake and spherical. With the increase of Nb content, the solid solubility of Ni atom in Cu-NiNb alloy matrix decreases, the melting point of alloy decreases, and the thermal conductivity increases. The second phase of Cu-20Ni-5Nb alloy was fine flake and spherical, uniformly distributed in the matrix. The volume fraction of the second phase was 19.2%, the melting point of the alloy was 1 134.92 ℃ and the thermal conductivity was 45.25 W / (m · K ), To meet the manufacture and use of cast Cu cooling water jacket requirements.