DEVELOPMENT OF TECHNOLOGICAL PRINCIPLES FOR APPLYING A COMPOSITION OPTIMIZED COMPOSITE COATING OF CERAMICS
Keywords:
ceramic-metal plasma coatings, compression plasma flows, processing distance, molded structures, surface layers, molded wear-resistant coatingsAbstract
The article presents the developed technological scheme for applying composition-optimized ceramic
composite coating based on Al2O3-TiO2-NiCrAlITа and Al2O3-TiO2-Mo materials. It includes a number of technological operations: preliminary preparation of the developed powders and the working surface of the samples,
coating, subsequent high-energy processing in order to improve the operational characteristics of the coating.
The most promising for obtaining wear-resistant plasma coatings that increase the durability and reliability of
mechanisms and machines are those materials that can withstand maximum loads without plastic deformation in
friction pairs in a wide range of operating temperatures and have the highest resistance to abrasive wear, the
ability to work in aggressive environments and vacuum. The most promising for operation under such conditions
are compositions that consist of a ceramic-metal matrix and an oxide component evenly distributed in it. To increase the adhesive and cohesive strength of the plasma coating and reduce the residual stresses formed in the
resulting “coating-substrate” system, it is advisable to use pre-spraying of the sublayer. In this case, the sublayer used should have an increased strength of adhesion to the substrate and be characterized by sufficient plasticity and a thermal expansion coefficient that closely corresponds to the coefficient of the material of the outer
layer of the formed coating. When forming plasma coatings based on ceramics with the use of metal additives, it
is effective to spray intermediate sublayers based on nickel and molybdenum with a size of 0.10-0.20 mm. Structural elements in the working surface of the applied powder materials must be distributed evenly. The level of
energy impacts on the layers of the formed coating is correlated with the change in distances during processing.
Under shock and wave effects of pulses of the compression plasma flow, plastic deformation and significant
compaction of the treated layer of the applied plasma coating occur. Ultrafast cooling and corresponding heat
removal to the substrate, after melting of the formed layer with a thickness of about 20-30 microns, is the result
of the thermal effect of compression plasma pulses.
References
Obtaining a composite ceramic material for thermal spraying / V.A. Okovity [and others] // Science and technology, BNTU. - Minsk. - 2017. Issue. 3. - P. 193-199.
Panteleenko, F.I. Investigation of plasma two-layer composite coatings zirconium dioxide - nichrome / F.I. Panteleenko, V.A. Okovity, E.F. Panteleenko // Actual problems in mechanical engineering, NSTU. - Novosibirsk - 2017. Volume 4. No. 3. - P. 100-105.
Formation and study of plasma two-layer composite coatings (viscous metal layer NiCr and solid ZrO2) / V. A. Okovity [and others] // Science and Technology, BNTU. - Minsk. - 2018. - Issue 1. - P. 21-28
Plasmatron for coating / V. A. Okovity [and others] // Science and technology, BNTU. - Minsk. – 2019. - Issue 1. - S. 5-10.
Analysis and selection of possible options for spraying composite multilayer coatings from ceramic powders on protective screens / F. I. Panteleenko [et al.] // Fundamental and applied problems of engineering and technology. - 2019. - No. 4-2 (336). - P.166-171.
Analysis and selection of possible options for spraying composite multilayer coatings from ceramic powders on protective screens / F.I. Panteleenko [et al.] // Dynamics, reliability and durability of mechanical and biomechanical systems: abstracts of the international scientific and technical conference. - 2019. - Moscow. - C.42-45.
Formation of plasma powder coatings from ceramics with subsequent high-energy modification to improve the operational characteristics of the surface / F.I. Panteleenko [and others] // Welding in Russia - 2019. Current state and prospects: abstracts of the international conference, Tomsk, September 3-7. 2019 / Tomsk Polytechnic University. in-t; editor: Yu.N. Saraev. - Tomsk, 2019. - P. 198.
Okovity, V. A. Formation and study of multilayer composite oxide plasma coatings on elements of screen anti-meteor protection ”for an international scientific and technical journal / Okovity V.A., Panteleenko F.I., Devoino O.G., Okovity V.V., Astashinsky V. M., Khramtsov P.P., Chernik M.Yu., Uglov V.V., Sobolevsky S.B. // “Science and technology” BNTU, 2016. - Issue 5.- P.357-364.
