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Oxidation of Ag–Sn–La Alloy Powders

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Abstract

The gas atomized Ag-9.26wt%Sn-0.44wt%La alloy powders were oxidized in air between 400 and 900 °C. The oxidation thermodynamics, kinetics and microstructure of the alloy were investigated. We suggested that the addition of La may accelerate oxidation of Sn and prevent the formation of the dense SnO2 film. The suitable oxidation temperature of the alloy powders is 800 °C in air. After internal oxidation, many cracks were observed on the surface of the alloy powders. In addition, the whole oxidation process of the alloy powders is controlled by the oxygen diffusion. The diffusion coefficient of oxygen in the alloy powders at 800 °C is about 1.5 times larger than that at 700 °C on the initial stage of internal oxidation, while that is 4.5 times on the subsequent stage.

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Acknowledgements

This work is supported by China Science and Technology program (2006BAE03B03) and by the Production and Study program (2006D90404015) of the Ministry of Education of Guangdong province of China. The authors wish to acknowledge the much help of Shoji Goto professor.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Central South University, Changsha, 410083, China

    C. P. Wu, D. Q. Yi, C. H. Xu, J. Li, B. Wang & H. Zhang

  2. Foshan Electrical Precision Alloy Co. Ltd., Foshan, 528000, China

    X. D. Lu

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  1. C. P. Wu
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  2. D. Q. Yi
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  3. C. H. Xu
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  4. J. Li
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  6. X. D. Lu
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  7. H. Zhang
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Correspondence to D. Q. Yi.

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Wu, C.P., Yi, D.Q., Xu, C.H. et al. Oxidation of Ag–Sn–La Alloy Powders. Oxid Met 70, 121–136 (2008). https://doi.org/10.1007/s11085-008-9106-1

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  • DOI: https://doi.org/10.1007/s11085-008-9106-1

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