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Wang X.,Jiqiang Shanghai Metal Industries Co. | Wang Y.,Jiqiang Shanghai Metal Industries Co. | Yu L.,Jiqiang Shanghai Metal Industries Co. | Ruan W.,Jiqiang Shanghai Metal Industries Co. | Zhang L.,Jiqiang Shanghai Metal Industries Co.
Xiyou Jinshu/Chinese Journal of Rare Metals | Year: 2010

The internal oxidized Ag-based alloys were widely used in the electrical contact field for their excellent electrical and thermal conductivities. The internal oxidation behavior, microstructure and properties of AgCu4Ni0.3 alloys under oxygen condition at 700°C were investigated, and the oxidation mechanism was studied in terms of thermodynamics and kinetics. The results showed that after oxidized at 700°C for 8.5 h, the oxidized layer was composed of CuO and NiO, and no Ag oxides were found, which implied that the selected oxidation of Cu and Ni occurred in AgCu4Ni0.3 alloys. The cross-sectional images illustrated that after oxidized for 8.5 h, the 0.8 mm-thick alloys were fully oxidized, and the CuO and NiO particles distributed in the matrix dispersively. The hardness (HV) of internal oxidized alloys was 126 which was much higher than that of the as-deposited alloys. All these results showed that the internal oxidation of AgCu4Ni0.3 alloys in air was feasible, which was in accordance with the thermodynamics calculation result and provided a theoretical and experimental basis for the production of internal oxidized AgCuNi alloys.

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