DOI: 10.18503/1995-2732-2023-21-2-114-126
Abstract
The paper analyzes the tribotechnical properties of antifriction materials based on powder iron-copper-graphite alloys of various compositions depending on the heat treatment of the samples, the lubricant used and the influence of the composition of surface-active substances (surfactants) in lubricant compositions on the formation of intermediate structures of the lubricating film in the contact zone of friction pairs. Electron probing methods were used to study types of the intermediate structures (films), as well as the microstructure of the surface layers of iron-copper-graphite alloy samples. It has been shown that to improve the tribotechnical properties of powder alloys based on Fe-Cu-Gr and Fe-Br-Gr, it is appropriate to add solutions of carboxylic acids or other surfactants into lubricants. It has been established that breaking-in time of friction pairs “block – shaft” in case of using a mixture of I-40 oil and an alcohol solution of oleic acid as lubricants, for the iron-copper-graphite powder alloy samples with a porosity of 18-22% decreases by 4-6 times, and the friction coefficient decreases by 2.2-2.5 times, and the system goes into a wear-free operation mode. It has been established that quenching after sintering of iron-copper-graphite compositions containing over 3-5% Cu activates tribosynthesis of intermediate structures and self-organization in friction pairs. The authors determined the effect of the graphite concentration on kinetics of diffusion mass transfer of copper and on the coefficients of interdiffusion and in Fe-Cu-Gr powder alloys, and analyzed the percentage distribution of copper in interparticle contacts in the Fe-5%Cu alloy in various heat treatment options to determine the distribution of copper in sintered antifriction materials, predict their structure formation and properties of products made from them.
Keywords
friction unit, tribotechnical properties, tribosynthesis, iron-copper-graphite powder alloys, chemical composition, intermediate structures, lubricants, surfactants, carboxylic acids, diffusion mass transfer
For citation
Gasanov B.G., Azarenkov A.A., Kharchenko E.V., Panchvidze G.G. Influence of the Chemical Composition of Fe-Cu-Gr Powder Alloys and Lubricants on Diffusion Mass Transfer and Tribosynthesis of Intermediate Structures in Friction Units. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2023, vol. 21, no. 2, pp. 114-126. https://doi.org/10.18503/1995-2732-2023-21-2-114-126
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