Properties of ceramic products based on Al2O3. In Ref., the tribological properties of a sample with a Cr-DLC coating were compared in terms of friction with samples of Al2O3, ZrO2, Si3N4, and WC without coating during the tribological ball-on-disc wear tests in a helium atmosphere. The tribological properties of a sample with a DLC coating were significantly higher in the air than in the helium atmosphere. The wear rates in the helium atmosphere were inversely proportional to the COF of the corresponding tribopairs. In Ref., the properties of a DLC coating deposited on an Al2O3 substrate were modeled using 2D finite element modeling. An increase in the thickness of a DLC coating led to an increase in the Vickers hardness and crack resistance. The electrochemical properties of DLC coatings deposited on an (Al2O3 + TiC) substrate were also studied. The DLC coating is capable of minimizing substrate surface defects and significantly reducing the intensity of oxidation processes. An increase in the surface properties of ceramic products (medical implants) made of β-SiAlON by applying DLC coatings has been considered. The deposition of DLC coatings could increase surface hardness and improve surface quality. Using DLC coatings to enhance the operating properties of products made of ceramic based on Cr2O3 and ZrO2 was also considered. In Refs., the tribological properties of samples with coatings of DLC, TiN, TiAlN, and ceramics based on Cr2O3 were compared with a counter body of cast iron. Samples with the DLC coatings showed the best scuff resistance and the lowest COF. The use of the DLC coatings to increase wear resistance and reduce the COF for samples of ceramic materials with SiC, Si3N4, and ZrO2 has been considered. The studies conducted in air and water, a nitrogen atmosphere, and a vacuum showed a significant decrease in the COF and an increase in the wear and oxidation resistance after the deposition of the DLC coatings. The studies also focused on combined coatings with the DLC layers of TiSiN-CrCx/a-C:H, CrAISiN + DLC, DLC-WS2, and DLC/TiAIN/TiN. These multilayer systems can significantly extend the application scope of the DLC coatings by providing an increase in resistance to crack growth and brittle fracture and by improving adhesion to the substrate. The article discusses the specific features of the deposition of (Cr,Al,Si)N-(DLC-Si) composite coatings on the (Al2O3 + TiC) ceramic substrate and studies the performance properties of ceramic cutting tools with the above coatings. Three coating options were considered, including a (Cr,Al,Si)N transition layer and a DLC-Si wearresistant layer with various options of Si content. The coating structure was investigated using scanning electron microscopy, transmission electron microscopy (TEM), and high-resolution TEM. The crystalline structures of the coatings were studied using the selected-area diffraction pattern. The studies substantiated the need for the application of a (Cr,Al,Si)N transition layer between a ceramic substrate and the DLC-Si coating, and the influence of the Si content on the coating properties was also considered. The cutting properties of tools with the DLC-Si coatings of various structures were studied during the turning of AISI 52100 (HRC 56-58) hardened steel. The studies also focused on the wear pattern of uncoated tools and tools with the studied coatings. The application of the (Cr,Al,Si)N-(DLC-Si) coating changes the wear pattern and can prolong the life of a ceramic cutting tool.
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