Влияние ионной имплантации на свойства чугуна, используемого в конструкциях горнодобывающих машин и аппаратов

Abstract

Introduction. Cast iron is a widely used material in mechanical engineering, mining and other industries. Modification of the surface properties of cast iron by ion implantation is of great interest. Research methods and materials. Samples of cast iron before and after implantation with C+, B+, N+ ions with dose D = 1017 ions/cm2 and energy of 40 keVwere taken for research. All samples were tested for wear resistance; microhardness was also measured and X-ray analysis was performed. Research results. It is shown that cast iron samples after ion implantation had higher wear resistance and microhardness in comparison with the initial state. The increase in hardness of all samples is apparently associated with the presence of a large number of specific radiation defects and the formation of dispersed phases (nitrides, borides, carbides). Discussion of the research results. The study of micro-hardness was carried out to determine the depth of the hardened layer after ion implantation with C+ , B+ , and N+ ions. The highest micro-hardness was detected at the surface of the sample after irradiation with N + ions. The lowest micro-hardness was obtained by B+ ions. X-ray analysis of cast iron samples after implantation by C+ , B+ , and N+ ions with dose D = 1017 ions/cm2 was the fine structure are observed. Conclusion. Ion implantation of cast iron with C+, B+, N+ ions has shown that irradiation leads to: Increased wear resistance of the material; A significant increase in micro-hardness; Changes in the fine structure of the implanted cast iron (mosaic block size and average dislocation density) and the formation of carbides, borides, and nitrides. Resume. The results of the research show that ion implantation of cast iron can significantly increase the wear resistance of various units of machines (parts) and other mining equipment, which ultimately increases their service life. Suggestions for practical application and direction of future research. The shown results allow us to propose the method of ion implantation as a hardening treatment of parts made of cast iron used, in particular, in the mining industry. In order to develop ion implantation as one of the hardening technologies, it would be advisable to continue studying various physical and chemical properties (for example, corrosion resistance) after exposure to ion implantation.