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Oxidation Behavior of Ag-20Cu-30Cr Alloy Prepared by Powder Metallurgy Method in 0.1 MPa Pure O2 at 700 and 800 °C

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Abstract

The oxidation behavior of Ag-20Cu-30Cr alloy prepared by powder metallurgy method was investigated in 0.1 MPa pure O2 at 700 and 800 °C. The alloy oxidation kinetics deviates from the parabolic rate law and consists of several quasi-parabolic stages with different rate constants. The alloy oxidation rate at 800 °C is bigger in the initial 4 h and afterward smaller than that at 700 °C up to 24 h. Ag-20Cu-30Cr alloy produces complex oxide scales. At 700 °C, the outer region consists of CuO layer partly covered by metal Ag, while the inner mixed oxidation region consists of alloys and oxides. With the increase of time, an irregular continuous and protective thin layer of Cr2O3 is produced at the base of oxide scales. At 800 °C, the outer region consists of CuO layer, the middle region consists of a metal Ag layer plus a mixed layer of Cu, Ag and Cr oxides or their double oxides, while the inner region consists of a regular continuous and protective thin layer of Cr2O3, which avoids the further oxidation of the alloy.

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Acknowledgments

The authors are grateful for the financial supports from the National Natural Science Foundation of China (51271127 and 22075186), the Liaoning Provincial Key Research and Development Program of China (2018304025), and the Scientific Research Program of Education Department of Liaoning Province of China (LJC201911).

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Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang, 110034, China

    Yang Han, Jiarui Yu, Xinyue Fan, Changwei Li, Zhongqiu Cao, Yan Wang & Ke Zhang

  2. Experimental Teaching Centre, Shenyang Normal University, Shenyang, 110034, China

    Shigang Xin

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  1. Yang Han
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Correspondence to Zhongqiu Cao.

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Han, Y., Yu, J., Fan, X. et al. Oxidation Behavior of Ag-20Cu-30Cr Alloy Prepared by Powder Metallurgy Method in 0.1 MPa Pure O2 at 700 and 800 °C. J. of Materi Eng and Perform 30, 9209–9214 (2021). https://doi.org/10.1007/s11665-021-06119-y

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  • DOI: https://doi.org/10.1007/s11665-021-06119-y

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