Strengthening of the composite materials based on metal matrix and carbon nanotubes
https://doi.org/10.29235/1561-8358-2019-64-2-166-174
Abstract
Carbon nanotube (CNT)-reinforced powder nanocomposites based on copper matrix were successfully fabricated using a spark plasma sintering method. In this work, the mechanisms of hardening the metal matrix with nanosized filler particles were shown. A comparative analysis of the calculated and experimental values of the ultimate compressive strength for samples based on the copper matrix and carbon nanotubes was performed. Linear and root-mean-square models of hardening of composite materials with nano-sized filler were presented. The root-mean-square model allowed us to calculate reliably the values of the ultimate compressive strength at a concentration of CNT in the material up to 0.07 wt.%. The ultimate compressive strength decreases sharply when the content of CNTs in the material is more than 0.07 wt.%. The Orovan mechanism is the predominant mechanism of strengthening of composite materials: copper – CNT. The predominance of Orovan mechanism over other strengthening mechanisms is explained by the relatively low transfer efficiency of the load between the initial components of the material due to the weak interfacial connection between the matrix and the filler, the insufficiently uniform distribution of CNTs in the metal matrix, the agglomeration of nanosized filler, the location of a certain number of CNTs in the pore space of the metal matrix, the presence of pores of irregular shape. The results of the work were used in the development of new antifriction composite materials with improved strength properties for friction units of machines and mechanisms for various purposes.
Keywords
copper,
metal matrix,
carbon nanotubes (CNT),
copper powder,
ultimate compressive strength,
strengthening
Supporting agencies: The work was supported by the Belarusian Republican Foundation for Fundamental Research (Project T17MS-015). The authors wish to thank to the researchers of the Laboratory “Mechanics, Diagnostics, Non-Destructive Testing” of the Institute of Mechanics of the Bulgarian Academy of Sciences for their assistance in setting up the experiment and discussing the results of the presented work.
About the Authors
V. N. Pasovets
University of Civil Protection of the Ministry of Emergency Situations of Belarus; State Scientific and Production Association of Powder Metallurgy
Belarus
Belarus
Vladimir N. Pasovets – Ph. D. (Engineering), Associate Professor; Doctoral Student
25, Mashinostroiteley Str., 220118, Minsk; 41, Platonov Str., 220005, Minsk
V. A. Kovtun
Gomel branch of the University of Civil Protection of the Ministry of Emergency Situations of Belarus
Belarus
Belarus
Vadim A. Kovtun – D. Sc. (Engineering), Professor
35, Rechitsky Ave., 246021, Gomel
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