ZHORNIK Viktor Ivanovich,
Head of the Department of Technologies of Mechanical Engineering and Metallurgy – Head of the Laboratory of Nanostructured and Superhard Materials,
D. Sc. in Eng., Associate Professor
Directions of activities
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DEVELOPMENT OF NANOSTRUCTURED ANTIFRICTION MATERIALS MODIFIED WITH NANOSCALE ADDITIVES, INCLUDING NANODIAMONDS, FOR HEAVY-DUTY AND HIGH-TEMPERATURE FRICTION UNITS
Nanodiamond particles with their extremely high surface energy are a powerful structure-forming agent capable of influencing crystallization processes in the direction of structure grinding. The diffusion of carbon additives during the formation of the structural and phase state of the modified material is aimed at increasing the content of solid hardening phases (carbides, solid carbon solutions in the metal). The graphite-like shell of particles contained in the charge contributes to an increase in the content of components with a layered structure in the modified composite during the formation of the structure. Nanoscale solid particles of the diamond-containing additive contribute to the dispersed hardening of the composite material.
NANOSTRUCTURED ANTIFRICTION MATERIALS
a) Lubricants
a) Lubricants
New principles of modification of greases with nanoscale additives by forming a binary dispersed phase including salts of high molecular weight acids and nanoparticles of the additive are proposed. In this case, the nanoparticles act as reaction centers for the structure formation of the dispersed phase and functional fillers. The physical principle of modification involves the introduction of existing nanoparticles into the composition of the dispersion medium at a certain stage of the process of obtaining a grease. The chemical principle of modification involves the synthesis of nanoparticles in the process of producing the grease from components of a dispersion medium.
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An example of the physical principle of modification:
Complex lithium grease OIMOL KL EPR 2 with a package of nano- and micro-dimensional additives introduced at certain stages of the formation of the dispersed phase has a spatially crosslinked frame of short-fiber filaments with greater oil retention capacity, which determines its higher load capacity (by 1.6–3.3 times), extended by 30–40 °C operating temperature range and a 1.4–1.7 times increased lubrication life.
Areas of application — recommended for lubrication of friction units operating under high loads and vibrations (mining machinery, railway transport, road construction machinery, agricultural machinery) at high temperatures (forging and pressing equipment, furnace fans, supply and exhaust ventilation systems, etc.). |
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An example of the chemical principle of modification:
The complex calcium sulfonate grease OIMOL KSC WR 2 is obtained according to the synthesis scheme of nanocalcite particles with crystallization centers of the dispersed phase. The structure of the dispersed phase of the grease is a set of star-shaped micelles consisting of thin needle-shaped crystals of calcium sulfonate, covered with stabilizing polymer shells and interconnected due to the forces of intermolecular interaction. This shape of the movable frame of the dispersed phase determines the high adaptivity of the grease to the level of mechanical and thermal stress of the friction unit. The grease is characterized by high extreme pressure properties, water resistance, thermal resistance, unique mechanical stability, improved antioxidant and anti-corrosion characteristics. Areas of application — recommended for the lubrication of highly loaded rolling and sliding bearings of machinery and equipment operating at low/medium speeds at high temperatures (steel rolling and thermal power equipment, mining and processing machines, road construction and agricultural machinery, railway transport, glass, cement and pulp and paper industries, etc.), as well as for lubricating mechanisms operating in conditions of high (up to 100 %) humidity (marine transport, port equipment, etc.) |
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b) Electrochemical chrome-diamond coatings on the elements of friction units
During the formation of the composite coating, simultaneously with the adsorption of a thin film of chromium crystallites on the substrate, nanoscale particles of the dispersed phase (nanodiamonds) are deposited from the electrolyte, which are additional crystallization centers. An increase in the number of nuclei leads to overgrowth of the substrate surface with a layer of composite coating consisting of smaller microspherulites (6–10 µm) containing 200–250 nm subgrains. The chromium coating modified by nanodiamond particles is characterized by increased density, hardness and wear resistance.
Areas of application — friction units of technological equipment and machines for various purposes (hydraulic cylinders of machine tools, agricultural machinery, mobile machines, submersible pumps, etc.)
Areas of application — friction units of technological equipment and machines for various purposes (hydraulic cylinders of machine tools, agricultural machinery, mobile machines, submersible pumps, etc.)
- CREATION OF SUPERHARD COMPOSITE MATERIALS BASED ON NANO-, SUBMICRO- AND MICRO-POWDERS OF CUBIC BORON NITRIDE AND DIAMOND FOR BLADED AND ABRASIVE TOOLS
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The use of ultrafine powders of cubic boron nitride and diamond makes it possible to reduce the temperatures and pressures of synthesis and sintering of superhard composite materials, ensure the formation of a fine-grained composite structure, and increase their density, hardness, and crack resistance. Nanostructured composites based on cubic boron nitride and diamond are used as highly efficient cutting elements of blade tools for processing hardened steels and cast iron, as well as in the manufacture of abrasive tools for superfinishing of parts.
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- DEVELOPMENT OF METHODS FOR MANUFACTURING CUTTING AND DRESSING TOOLS, INCLUDING DIAMOND-CONTAINING ONES, USING ELECTROCONTACT HEATING
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The use of electrocontact heating for sintering powdered, including diamond-containing, composite materials ensures the production of a finely dispersed structure in a sintered high-density composite, the exclusion of diamond graphitization during sintering, the possibility of implementing the sintering process without a protective atmosphere, which leads to high physico-mechanical and tribotechnical properties of sintered composite materials and increased operational reliability of cutting and dressing tools on their basis (diamond pencils for straightening abrasive circles, diamond ring drills for processing non-metallic materials, carbide dies for straightening reinforcing bars, etc.)
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Products
- Grease OIMOL KSC WR 2 (water resistant)
- Grease OIMOL KL MP 2 (multifunctional)
- Grease ITMOL LC HD 2 (multifunctional)
- Grease OIMOL KL EPR 2 (anti-seize)
- Grease OIMOL KL EP 2 (anti-wear)
- Greases ITMOL LC FN (environmentally friendly)
- Greases ITMOL LC FM (food-grade)
- Grease OIMOL KL R 2 (running-in)
Contacts
| ZHORNIK Viktor Ivanovich, Head of the Department of Technologies of Mechanical Engineering and Metallurgy – Head of the Laboratory of Nanostructured and Superhard Materials, D. Sc. in Eng., Associate Professor |
| tel.: +375 (17) 379 25 18 |
| e-mail: |
