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<p>The existence of a particle oxide layer affects the mass distribution, thermophysical properties, and surface characteristics of particles, so it is necessary to carry out detailed parametric description of the physical and chemical properties of oxidized spray particles. Therefore, based on the oxidation parameters of spray particles obtained from the spray flow field, oxidized sprayed particles were introduced into the particle deposition mode. At the same time, considering the particle oxidation degree, substrate roughness, and grain heterogeneity of stainless-steel substrates, a 3D supersonic thermal (HVOF) spray process multiphase particle sputtering deposition microcrystal model was established. The sputtering deposition behavior of an oxidized particle flow and of a non-oxidized particle flow were compared and analyzed, and the transient evolution law of the temperature field, strain field, and stress field caused by sputtering deposition of sprayed particles was revealed. The results show that the oxide layer impedes the heat transfer and the local stress concentration effect caused by brittleness. It was shown that the temperature, velocity, and stress of the coating deposited by oxidized particles are higher than that without considering oxidation. The temperature was 1700&#xa0;K, the stress was 1109&#xa0;Mpa and the strain was 16.7, resulting in a 1.73% higher porosity than that without considering oxidation.</p>

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Transient Study on the Effect of Particle Oxidation State on Coating Deposition Mechanism in HVOF Thermal Spraying

  • 期刊论文

  • 发表日期：

    2025年10月16日

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  • Xuan Wang,
  • Xing Han,
  • Chang Li,
  • Siyu Li,
  • Haohao Mei

摘要

The existence of a particle oxide layer affects the mass distribution, thermophysical properties, and surface characteristics of particles, so it is necessary to carry out detailed parametric description of the physical and chemical properties of oxidized spray particles. Therefore, based on the oxidation parameters of spray particles obtained from the spray flow field, oxidized sprayed particles were introduced into the particle deposition mode. At the same time, considering the particle oxidation degree, substrate roughness, and grain heterogeneity of stainless-steel substrates, a 3D supersonic thermal (HVOF) spray process multiphase particle sputtering deposition microcrystal model was established. The sputtering deposition behavior of an oxidized particle flow and of a non-oxidized particle flow were compared and analyzed, and the transient evolution law of the temperature field, strain field, and stress field caused by sputtering deposition of sprayed particles was revealed. The results show that the oxide layer impedes the heat transfer and the local stress concentration effect caused by brittleness. It was shown that the temperature, velocity, and stress of the coating deposited by oxidized particles are higher than that without considering oxidation. The temperature was 1700 K, the stress was 1109 Mpa and the strain was 16.7, resulting in a 1.73% higher porosity than that without considering oxidation.