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A New Nonspherical Oxidation Model of Metal Particles

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Abstract

This paper analyzes the oxidation law of metal particles and proposes a new oxidation reaction rate model, based on measurements of thermogravimetric-mass spectrometer (TG-MS), X-ray diffractometer (XRD) and scanning electron microscope (SEM). The model is named EBM (egg broken model) with a formula of exponential law. According to the model, the aluminum particles do not react in a spherical shape, but crack and the melted metal inside flows out to form a new nonspherical surface and the reaction rate is still determined by the surface area. The model is verified with heating rates of 5°C/min, 10°C/min and 25°C/min, and with particle size of 1–2 µm, 8–9 µm and 20–22 µm. Many models are based on spherical hypothesis and the new model gives a different physical illustration to explain oxidation progress of metal particles. The new model gives an exponential law, which fits the experimental data well, and it may be useful to understand oxidation mechanism of metal particles.

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Acknowledgement

The study was financially supported by the joint fund of National Natural Science Foundation and China Academy of Engineering Physics (NSAF) under grant No. U1530157. The authors greatly appreciate the support provided by the grant.

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Authors and Affiliations

  1. Innovation Academy for Light-duty Gas Turbine, Chinese Academy of Sciences, Beijing, 100190, China

    Weijie Zhao, Yan Wang, Yanling Cui, Baorui Wang & Yue Wang

  2. Key Laboratory of Advanced Energy and Power, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing, 100190, China

    Weijie Zhao, Yan Wang, Yanling Cui, Baorui Wang & Yue Wang

  3. Advanced Gas Turbine Laboratory, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing, 100190, China

    Weijie Zhao, Yan Wang, Yanling Cui, Baorui Wang & Yue Wang

  4. University of Chinese Academy of Sciences, Beijing, 100049, China

    Weijie Zhao, Yan Wang, Yanling Cui, Baorui Wang & Yue Wang

  5. Institute of Applied Physics and Computational Mathematics, Beijing, 100094, China

    Dongjun Ma

Authors
  1. Weijie Zhao
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  2. Yan Wang
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  3. Yanling Cui
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  4. Baorui Wang
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  5. Dongjun Ma
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  6. Yue Wang
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Correspondence to Baorui Wang.

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Zhao, W., Wang, Y., Cui, Y. et al. A New Nonspherical Oxidation Model of Metal Particles. J. Therm. Sci. 32, 812–821 (2023). https://doi.org/10.1007/s11630-023-1734-2

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  • DOI: https://doi.org/10.1007/s11630-023-1734-2

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