Volgograd State Technical University, Volgograd, Russia:

N. Yu. Miroshkin, Head of Laboratory, Chair for Machinery and Technology of Foundry Production, e-mail: nikolays34rus@gmail.com
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.

1. Antipin G. V., Bannikov М. L., Domashnev А. D. et al. Face seals for chemical production equipment. Moscow: Mashinostroenie, 1984. 112 p.
2. Fialkov А. S. Processes and apparatuses for production of powder carbongraphite materials. Moscow : Aspekt Press, 2008. 686 p.
3. Nagorny V. G., Kotosonov А. S., Ostrovskiy V. S. et al. Properties of graphite-based structural materials : handbook. Edited by V. P. Sosedov. Moscow : Metallurgiya, 1975. 336 p.
4. Livshits P. S. Handbook : electric machine brushes. Moscow : Energoatomizdat, 1983. 216 p.
5. Evans A., SanMarchi C., Mortensen A. Metal matrix composites in industry: an introduction and a survey. NY : Kluwer Academic Publishers, 2003. p. 423. DOI: 10.1007/978-1-4615-0405-4
6. Ali M. M., Nived N. Composites materials for sustainable space industry: A review of recent developments. World Review of Science, Technology and Sustainable Development. 2021. No. 17. pp. 172–196. DOI: 10.1504/WRSTSD.2021.114680
7. Suresha S., Sridhara B. K. Wear characteristics of hybrid aluminium matrix composites reinforced with graphite and silicon carbide particulates. Composites Science and Technology. 2010. No. 70. pp. 1652–1659. DOI: 10.1016/j.compscitech.2010.06.013
8. Etter T., Papakyriacou M., Schulz P., Uggowitzer P. J. Physical properties of graphite/aluminium composites produced by gas pressure infiltration method. Carbon. 2003. No. 41. pp. 1017–1024. DOI: 10.1016/S0008-6223(02)00448-7
9. Calderon N. R., Voytovych R., Narciso J., Eustathopoulos N. Pressureless infiltration versus wetting in AlSi/graphite system. Journal of Materials Science. 2010. No. 45. pp. 4345–4350. DOI: 10.1007/s10853-010-4358-y
10. Kostikov V. I., Varenkov А. N. Interaction of metal melts with carbon materials. Moscow : Metallurgiya, 1981. 184 p.
11. Cuevas A. C., Bercerril E., Martinez M. S. Metal matric composites: wetting and infiltration. Cham, Switzerland : Springer, 2018. 221 p.
12. Malaki M., Tehrani A. F., Niroumand B., Gupta M. Wettability in metal matrix composites. Metals. 2021. No. 11. DOI: 10.3390/met11071034
13. Léger A., Weber L., Mortensen A. Influence of the wetting angle on capillary forces in pressure infiltration. ActaMaterialia. 2015. No. 91. pp. 57–69. DOI: 10.1016/j.actamat.2015.03.002
14. Mortensen A. Melt infiltration of metal matrix composites comprehensive composite materials. Oxford : Pergamon, 2000. pp. 521–524.
15. Kostikov V. I., Varenkov А. N. Composite materials based on aluminum alloys reinforced with carbon fibers. Moscow : Intermet Inzhiniring, 2000. 446 p.
16. Gulevskii V. A., Miroshkin N. Y., Gulevskii V. V. et al. Use of electroplating for increasing the efficiency and quality of impregnation of a porous graphitized carbon material with copper alloys. Russian Metallurgy (Metally). 2020. Vol. 2020, No. 7. pp. 746–751. DOI: 10.1134/S0036029520070071
17. Gulevskii V. A., Miroshkin N. Y., Antipov V. I. et al. Effect of alloying elements on the wetting of graphitized carbon with copper alloys. Russian Metallurgy (Metally). 2019. Vol. 2019, No. 1. pp. 72–76. DOI: 10.1134/S0036029519010051
18. Yampolskiy А. М. Precious metal coatings. Edited by P. М. Vyacheslavov. Iss. 7, 2^nd edition enlarged and revised. Moscow-Leningrad : MAShGIZ, 1961. 52 p.
19. GOST 2409–95. Refractories. Method for determination of bulk density, apparent and true porosity, water absorption. Introduced: 01.01.1997.
20. MI 00200851-142–2007. Method for determination of compressive strength of carbon-graphite materials at temperatures from 291 K to 303 K (attestation certificate No. 001-145-2008 dated from 14.02.2008 VNIIFTRI). 21. Naydich Yu. V. Contact phenomena in metallic melts. Kiev : Naukova dumka, 1972. 196 p.
22. Gomzin А. I., Gallyamova R. F., Galyshev S. N., Zaripov N. G. Suppression of formation of the carbide phase in the manufacture of carbon-aluminum composite. Molodezhny vestnik Ufimskogo gosudarstvennogo aviatsionnogo tekhnicheskogo universiteta. 2019. No. 2. pp. 34–37.
23. Lu Y., Wang X., Zhang Y., Wang J. et al. Aluminum carbide hydrolysis induced degradation of thermal conductivity and tensile strength in diamond/aluminum composite. Compos. Mater. 2018. No. 52. pp. 2709–2717.
24. Gulevskiy V. А. Possibilities of alloying lead matrix alloy during gasostatfree impregnation of carbon graphite. Izvestiya vuzov. Poroshkovaya metallurgiya i funktsionalnye pokrytiya. 2021. No. 15. pp. 41–48.