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Abstract <p>This article studies the causes of destruction of materials applied by cold gas-dynamic spraying (CGDS) to the surface of products operating in a vacuum. A-20-11 material, which is a mechanical mixture of aluminum, zinc, and corundum powders, was chosen for the experiments. Methods of X-ray computed tomography, scanning electron microscopy, and thermogravimetry, as well as method of determination of gases in metals, were used in the work. It is shown that materials obtained by CGDS method have no open porosity. Heating the carrier gas to 400°C does not lead to fusion of the coating material. It was found that it contains of hydrogen and oxygen, which are apparently located on the surface of sprayed material particles (aluminum, zinc, and corundum powders) in the form of adsorbed moisture. Heating the coating material leads to its evaporation. Expansion of resulting steam is the most likely cause of coating failure. The results obtained were used to improve the technology of applying CGDS coatings to the surface of products operating in a vacuum.</p>

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Study of Causes of Destruction of Materials Obtained by the Cold Gas-Dynamic Spraying during Their Operation in a Vacuum

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • K. A. Frolov,
  • A. A. Stepnov,
  • I. V. Belyaev,
  • V. E. Bazhenov,
  • P. S. Mogilnikov

摘要

Abstract

This article studies the causes of destruction of materials applied by cold gas-dynamic spraying (CGDS) to the surface of products operating in a vacuum. A-20-11 material, which is a mechanical mixture of aluminum, zinc, and corundum powders, was chosen for the experiments. Methods of X-ray computed tomography, scanning electron microscopy, and thermogravimetry, as well as method of determination of gases in metals, were used in the work. It is shown that materials obtained by CGDS method have no open porosity. Heating the carrier gas to 400°C does not lead to fusion of the coating material. It was found that it contains of hydrogen and oxygen, which are apparently located on the surface of sprayed material particles (aluminum, zinc, and corundum powders) in the form of adsorbed moisture. Heating the coating material leads to its evaporation. Expansion of resulting steam is the most likely cause of coating failure. The results obtained were used to improve the technology of applying CGDS coatings to the surface of products operating in a vacuum.