THE REGULARITIES OF NITROGEN DIFFUSION DURING THE ION-BEAM NITRIDING PROCESS OF AUSTENITIC THERMAL-SPRAYED COATING

GRIGORCHIK Aleksandr N., Post-Graduate Student, Joint Institute of Mechanical Engeneering of the National Academy of Sciences of Belarus, Minsk, Republic of Belarus

KUKAREKO Vladimir A., Dr. Phys.-Math. Sc., Associate Professor, Head of the Center of Structural Research and Tribo-Mechanical Test of Materials and Machine-Building Output, Joint Institute of Mechanical Engeneering of the National Academy of Sciences of Belarus, Minsk, Republic of Belarus, E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

BYELI Aleksey V., Dr. Techn. Sc., Corresponding Member, Associate Director, Physicotechnical Institute of the National Academy of Sciences of Belarus, Minsk, Republic of Belarus

BELOTSERKOVSKY Marat A., Dr. Techn. Sc., Associate Professor, Head of the Laboratory of Thermal Spray Methods of Machines units Managment, Joint Institute of Mechanical Engeneering of the National Academy of Sciences of Belarus, Minsk, Republic of Belarus

KHINA Boris B., Dr. Phys.-Math. Sc., Associate Professor, Chief Researcher, Physicotechnical Institute of the National Academy of Sciences of Belarus, Minsk, Republic of Belarus

The distribution of nitrogen and chromium atoms in nearsurface layers of austenitic thermal sprayed coating subjected to ionbeam nitriding at 870 K has been studied. It is established that the sprayed particles of the coating possess various chromium content. It is shown that, as a result of ionbeam nitriding, the nitrided layers have a higher depth in particles with a lower chromium concentration. The estimation of diffusion coefficient of nitrogen in the sprayed particles with different chromium content has been performed. It is shown that the diffusion coefficient of nitrogen during ionbeam treatment significantly exceeds the values observed during the process of traditional gasphase nitriding. It is established that the diffusion coefficient of nitrogen tends to decrease with increasing chromium content in the sprayed particles of the coating and decreases with distance from the outer surface.

thermal sprayed coating, ion-beam nitriding, chromium concentration, diffusion coefficient

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