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Information × Registration Number 0219U003011, 0118U000466 , R & D reports Title The use of a supersonic air jet for spraying arc coatings systems Fe-Cr-B popup.stage_title Head Gvozdetskyy Volodymyr, Registration Date 29-01-2019 Organization Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine popup.description2 Increasing the speed of an air jet with an electric arc spray provides an increase in their physical and mechanical characteristics. From the melt, droplets of smaller size, which are easily captured by an air jet, are formed. Dispersed droplets from electrode materials at a temperature of 1800-2100 ° C are less oxidized by the pressure of the cutting 1.2 than 0.6 MPa. An increase in the amount of oxides in the coating sprayed at a pressure of 1.2 MPa is due to a larger surface area of ??droplets up to 30 microns than droplets up to 220 microns. Increased oxide content contributes to the formation of the compositional structure. The oxides are located between the lamellae coatings, which at a pressure of 1.2 MPa have a thickness of 1 ... 3 microns, and at a pressure of 0.6 MPa 20 microns, while their volumetric content increases, which increases the microhardness from 250-300 to 320 ... 450 HV Their microhardness is 700-800 hV. The microhardness of the PD70X18P3 and X18P3C2 coatings also increases from 850 to 1050 HV for increasing air pressure. Increasing the pressure of the air jet from 0.6 MPa to 1.2 MPa reduces the total porosity from 8.0 to 2.0% and pore sizes from 30 to 3 mkm. The cogenesis of such coatings increases in 1,3 ... 2 times, and residual stresses are reduced by 20-25 MPa. This is due to a large number of sections of microwelding between the lamellae and the formation of thin (0.5 ... 3 microns) long oxide films that are tightly bonded with lamellae and reinforcement coatings. Product Description popup.authors Веселівська Галина Григорівна Задорожна Христина Романівна Сірак Ярина Ярославівна popup.nrat_date 2020-04-02 Close