Моделирование получения жаростойких защитных покрытий в условиях самораспространяющегося высокотемпературного синтеза
Journal Title: Математичне моделювання - Year 2017, Vol 1, Issue 2
Abstract
MODELING OF OBTAINING WELDING PROTECTIVE COATINGS UNDER THE CONDITIONS OF SELF-SPREADING HIGH-TEMPERATURE SYNTHESIS Beigyl O.A., Sereda D.B. Abstract Practical use of carbon-carbon composite materials (CCCM) in high-temperature processes is very limited due to strong oxidation, as well as erosion and burn-up in gas streams. In this regard, protecting the CCCM from oxidation and burnup is an important scientific and technical task. Prospective materials for applying protective coatings can be refractory compounds, especially carbides, borides, nitrides and silicides, as well as alloys based on them. In addition to protection from oxidation, coatings made from refractory compounds have high hardness and wear resistance. Known methods for obtaining coatings have a number of disadvantages and advantages. The most unacceptable is the fact that when the coating is impregnated with Si silicon from the liquid phase, the chemical interaction with the matrix of CCCM occurs and a carbide phase is formed, while the mechanical characteristics of the material change, as well as the fact that the carbide component is formed unevenly along the section of the base material. One of the most promising methods of HTO today is self-propagating high-temperature synthesis (SHS). From the analysis of the requirements for coatings on the CCCM, a diffusion method of surface saturation from the solid phase in the active gas medium in the SHS mode was chosen. A distinctive feature of this method is the high quality of the resulting coating surface, short duration, and high temperatures, which are characterized by the composition of the SHS mixture. Under the conditions of SHS, it is possible to obtain coatings of different chemical composition, varying the amount and content of alloying additives. In the coating application, CCCM was used. Chemical-thermal treatment was carried out in an open-type reactor (P = 105 Pa) in the temperature range 900-1100 оС and the total duration of isothermal exposure to 60 min. In order to search for compositions of powder SHS mixtures providing high wear resistance, a full factor experiment The choice of the optimum composition of the mixture for conducting SHS processes in the conditions of thermal auto ignition was carried out on the basis of the results of studies of the thermal picture of the SHS process and the physical and mechanical properties of the protective coatings The best heat resistance among the coatings under consideration are chromoaluminosilicate coatings. Their weight loss index was 33-50•10-4 g/m2, which is 1.5-1.7 times higher than for coatings obtained under isothermal conditions. 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Authors and Affiliations
О. А. Бейгул, Д. Б. Середа
Keywords
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