Overview of cold gas dynamic dusting: problems and prospects

Abstract

Problem. At present, the method of cold gas-dynamic coating for application of protective and restorative coatings is widely used in aerospace, automotive and other industries. Along with the excellent operational properties of the equipment for the method of CS there are also disadvantages: low coefficient of material use, possible porosity, which leads to a decrease in strength and deterioration of corrosion resistance. To eliminate the aforementioned shortcomings, high-pressure equipment is used to ensure the specified properties of surfaces and expand the application of the method of cold gas-dynamic spraying, at the same time, the costs of equipment and associated costs are multiplied by several levels. Goal. The analysis of the current state of the problem in the field of low pressure cold gasdynamic spraying (CS) on the possibility of influencing the quantitative and qualitative indices of the protective and restorative coatings created by this method and the study of the properties of such coatings was conducted in order to gain experience for further research in this field. Methodology. An analysis of literary sources led to the conclusion that it is necessary to revise the principle of modeling and development of equipment for producing coatings by the method of cold gas-dynamic spraying.. Results. The analysis of the current state of the issue in the field of influence on the quantitative and qualitative indicators of the protective and restorative coatings created by this method and the study of the properties of such coatings obtained by the method of CS showed that a more profound study of the influence on the temperature-speed parameters of particles of the spray material by gas-dynamic and external forces is required.Originality. The increasing demand for low-energy, environmentally safe, efficient and lowcost coating processes stimulates the search for and development of new alternative methods, one of which is cold spraying. Practical value. A third-party effect on the particle speed of the sprayed powder will not only reduce the temperature effect and, as a result, possible negative effects, but also significantly reduce the energy and material costs of the process, due to the rejection of expensive high-pressure equipment, as well as increase the efficiency of the process when working with low pressure.