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ArticleName Impregnation of carbon graphite with aluminum alloy. Part 1
DOI 10.17580/tsm.2023.06.08
ArticleAuthor Miroshkin N. Yu., Tsurikhin S. N., Kidalov N. A., Gulevsky V. A.

Volgograd State Technical University, Volgograd, Russia:

N. Yu. Miroshkin, Head of Laboratory, Chair for Machinery and Technology of Foundry Production, e-mail:
S. N. Tsurikhin, Associate Professor, Chair for Machinery and Technology of Foundry Production, Candidate of Technical Sciences
N. A. Kidalov, Head of the Chair for Machinery and Technology of Foundry Production, Doctor of Technical Sciences


Volgograd Industrial College, Volgograd, Russia:
V. A. Gulevsky, Lecturer, Candidate of Technical Sciences


A liquid-phase technology for obtaining carbon-graphite-aluminum frame metal-filled composite materials without the use of autoclave equipment using the example of impregnation of carbon-graphite materials (AG-1500 and SIGRI) is presented. The infiltration of the aluminum alloy into the open pores of the carbon-graphite frame was carried out under the pressure of the melt, realized due to the difference in the thermal expansion coefficients of the alloy and the material of the impregnation device during their joint heating. In order to improve the wetting of the aluminum alloy, the workpieces under study were electrochemically coated with a copper coating, which was applied using an experimental setup that made it possible to fill the open pores of the carbon-graphite skeleton with an electrolyte solution, followed by the application of an electrochemical coating. As a result, the copper coating was deposited not only on the surface of the frame, but also on the surface of its open pores filled with the electrolyte solution. The samples prepared in this way are infiltrated with an alloy of Al – 20% Mg – 20% Zn – 4% Cu at the temperature of 800 oC. On carbon-graphite frameworks from both materials without a copper coating, low filling of open pores was obtained and, as a result, a lower mass gain after infiltration — 1.9% for AG-1500 and 3.16% for SIGRI (of the initial mass). And for samples pre-coated with a copper electrochemical coating, the mass gain after infiltration was 16.9 and 21.62%, respectively. The latter indicates the efficiency of using the electrochemical copper coating to increase the infiltration of the aluminum alloy into the open pores of the carbon-graphite framework. A description is given of the kinetics of filling a capillary with the aluminum alloy under conditions without impregnation, when the temperature and pressure increase simultaneously. During the tests, it was found that the compressive strength of the CM based on the preliminarily copper-plated carbon-graphite frame AG-1500 increased by 2.5 times, and the SIGRI frame — by 2.6 times compared with the original materials.

The study was carried out with the financial support of Volgograd State Technical University within the framework of scientific project No. 8/466-22.

keywords Carbon-graphite materials, carbon, electrochemical coatings, aluminum alloy, infiltration, impregnation, pores, composite material

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