K. A. Frolov, A. A. Stepnov, I. V. Belyaev, V. E. Bazhenov, P. S. Mogilnikov
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Study of Causes of Destruction of Materials Obtained by the Cold Gas-Dynamic Spraying during Their Operation in a Vacuum
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.
期刊介绍：
Inorganic Materials: Applied Research contains translations of research articles devoted to applied aspects of inorganic materials. Best articles are selected from four Russian periodicals: Materialovedenie, Perspektivnye Materialy, Fizika i Khimiya Obrabotki Materialov, and Voprosy Materialovedeniya and translated into English. The journal reports recent achievements in materials science: physical and chemical bases of materials science; effects of synergism in composite materials; computer simulations; creation of new materials (including carbon-based materials and ceramics, semiconductors, superconductors, composite materials, polymers, materials for nuclear engineering, materials for aircraft and space engineering, materials for quantum electronics, materials for electronics and optoelectronics, materials for nuclear and thermonuclear power engineering, radiation-hardened materials, materials for use in medicine, etc.); analytical techniques; structure–property relationships; nanostructures and nanotechnologies; advanced technologies; use of hydrogen in structural materials; and economic and environmental issues. The journal also considers engineering issues of materials processing with plasma, high-gradient crystallization, laser technology, and ultrasonic technology. Currently the journal does not accept direct submissions, but submissions to one of the source journals is possible.
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