Based on a study of the structure and composition of the composite ceramic SiC − Al 2 O 3 − ZrO 2 , its tribomechanical properties and behavior in high-temperature corrosion, we recommend the material for use as sealing elements and for deposition of wear-resistant and corrosion-resistant coatings. We have studied the formation of gradient layers when the ceramic surface is modified with refractory titanium compounds TiN − TiB 2 (1:1) with an Fe(Ni) − Cr − Al undercoat using concentrated solar radiation and when the steel surface is modified with laser irradiation of the SiC − Al 2 O 3 − ZrO 2 coats. We have shown that laser modification of steel by the silicon carbide-based composite increases its corrosion resistance by a factor of 4-5 at 800-900°C.Demand is increasing in various industries for high-temperature coatings on parts to protect them from wear and corrosion and to provide thermal and electrical insulation. Silicon carbide composite materials are promising for these purposes: they have good physicomechanical and tribological characteristics [1][2][3]. In this work, we have studied the corrosion behavior of the composite ceramic based on silicon carbide SiC − Al 2 O 3 − ZrO 2 and the formation of gradient coatings on it when exposed to concentrated energy fluxes (solar and laser radiation).The composite material SiC − Al 2 O 3 − ZrO 2 was obtained by hot pressing. The resistance to high-temperature oxidation (up to a temperature of 1600°C) of the silicon carbide ceramic was studied on a Seteram. We used metallographic analysis, x-ray phase analysis, and electron probe microanalysis (EPMA) on respectively a PMT-3, DRON-2.0 (CuK α radiation), and Camebax SX-50 to study the structure and composition of the surface of SiC − Al 2 O 3 − ZrO 2 specimens in the initial state and after deposition of the coatings. The surface of the ceramic specimens (both the original ceramic and with multilayer nitrocellulose-based coatings of thickness up to 200 μm) was treated with concentrated solar radiation on an SGU-2 apparatus designed at the Institute for Problems of Materials Science, National Academy of Sciences of Ukraine based on a parabolic mirror concentrator of diameter 1.5 m. The radiant heat flux density was controlled using a shutter, and the amount of energy that could be absorbed by the surface of the specimens was controlled by the exposure time to concentrated solar radiation (5-15 sec). The radiant heat flux density was 14000-15000 kW/cm 2 . Laser treatment of steel 45 with a strip of powder composite glued on was carried out while blowing a stream of argon over the working zone, using a pulsed RC-3 CO 2 laser (power density 50 kW/cm 2 , laser beam displacement rate 0.6 m/min, overlap factor 0.5). The strips of powder composite SiC − Al 2 O 3 − ZrO 2 of thickness 200-300 μm were obtained by rolling on rollers. The tribological characteristics of the coatings (the coefficient of friction f and the wear rate I, μm/km) were studied on an MT-68 apparatus
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