Structure and properties of composite powder copper-based materials (Communicated by Academician Petr A. Vityaz)
https://doi.org/10.29235/1561-8323-2020-64-4-488-494
Abstract
The research results of the influence of graphite content, type and dispersion on the structure, mechanical and physical properties of copper—graphite composite material are presented. It is shown that in the sintering process, when the content of grade GL graphite is 1, 5, 7 %, shrinkage is 5.7; 2.4 and 0.6 %, respectively, with 20 and 30 % — no volumetric changes. In copper—graphite material, when the content of grade MG graphite is less than 10 %, a growth of samples of 1—1.6 % is observed; when the graphite content is higher, the volume practically does not change. With a graphite content of more than 20 %, regardless of its grade and dispersion, the strength of copper—graphite material sharply decreases due to both a reduction of the metal contact area and a transition of the material structure from frame-metal to matrix. In a material with grade MG graphite with the dispersion of 140 and 65 µm, multiple microcracks are formed in the deformation process. When the content of grade MG graphite is 10 %, the electrical resistivity of copper-graphite material is equal to 11—13•108 Ohm•m, when it is 30 %, the electrical resistivity is equal to 136—140•108 Ohmrm; when the content of grade GL graphite — 8 and 18•108 Ohm•m, respectively.
About the Author
L. N. Dyachkova
Powder Metallurgy Institute named after O.V. Roman
Belarus
Belarus
Dyachkova Larisa N. - D. Sc. (Engineering), Associate professor, Head of the Laboratory, Powder Metallurgy Institute named after O.V. Roman.
41, Platonov Str., 220005, Minsk.
References
1. Livshits P. S. The sliding contact of electric machines. Moscow, 1974. 158 p. (in Russian).
2. Chalykh E. F. Brushes for electric machines. Moscow, 1990. 189 p. (in Russian).
3. Gershman I. S. Current Collecting Carbon-Copper Materials. Vestnik VNIIZhT [VNIIZHT Scientific Journal], 2002, no. 5, pp. 15-20 (in Russian).
4. Temkin I. V. Production of electric coal and cermet products. Moscow, 1986. 255 p. (in Russian).
5. Gershman I. S. Compatibility of materials at friction with current collection. Journal of Friction and Wear, 2000, vol. 21, no. 5, pp. 71-74.
6. Fialkov A. S. Carbon-graphite materials. Moscow, 1979. 320 p. (in Russian).
7. Shulepov S. V. Physics of carbon-graphite materials. Moscow, 1972. 254 p. (in Russian).
8. Ostrovsky V. S., Virgiliev Yu. S., Kostikov V. I., Shipkov N. N. Artificial Graphite. Moscow, 1986. 272 p. (in Russian).
9. Gershman I. S. The development of wear-resistant materials using methods of nonequilibrium thermodynamics on the example of sliding electrical contacts. Moscow, 2006. 234 р. (in Russian).
10. Gupta S., Bharti H. A review on copper-graphite composite material fabrication & its mechanical properties. International Journal of Advance Research and Innovative Ideas in Education, 2016, vol. 2, no. 5, pp. 594-599. Available at: http://www.ijariie.com/FormDetails.aspx?MenuScriptId=2045 (accessed 23 March 2020).
11. Rajkumar K., Aravindan S. Microwave sintering of copper-graphite composites. Journal of Materials Processing Technology, 2009, vol. 209, no. 15-16, pp. 5601-5605. https://doi.org/10.1016/j.jmatprotec.2009.05.017
12. 10 Gershman I. S., Gershman E. I., Turnin P. G. Investigation of the properties and characteristics of graphite-copper materials with modified graphite. Vestnik VNIIZhT [VNIIZHT Scientific Journal], 2013, no. 3, pp. 43-48 (in Russian).
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