Experimental Researches on Obtaining Sintered Composite Materials with Copper Matrix

Using 663-tin bronze, Ni, W, nanoAl2O3, MoS2, graphite, CaF2, and Ni coated graphite as the matrix alloy powder, in which copper-coated carbon fiber of 5%, 7%, 9%, 11% and 13% in volume fraction were added as the reinforcing phase, a novel type carbon fiber/copper-matrix self-lubricating composite materials was prepared by means of powder metallurgy. The results indicate that the mechanical properties of the composite materials are improved after adding copper-coated carbon fibers. The composite materials reach optimal overall mechanical performance under testing when the volume fraction of the added copper-coated carbon fibers is 11%.: with a hardness of 57.8 HV and a compressive strength of 222 MPa. The addition of carbon fiber also improved the friction and wear properties of the composite materials. Increasing the volume fraction of fiber, was found to increase the wear resistance and improve self-lubricating performance. A volume fraction of 11% gave a friction coefficient of 0.09 and abrasion loss of 4mg.

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Theoretical and experimental investigation of the process of plastic deformation of sintered composite materials. I. Analysis of the conditions of simultaneous deformation of the different phases of a composite material

Soviet Powder Metallurgy and Metal Ceramics ◽

10.1007/bf00810619 ◽

1987 ◽

Vol 26 (8) ◽

pp. 615-620

Author(s):

S. S. Kiparisov ◽

I. A. Kiyanskii ◽

V. E. Perel'man

Keyword(s):

Experimental Investigation ◽

Plastic Deformation ◽

Composite Material ◽

Composite Materials ◽

Sintered Composite

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Strengthening of the composite materials based on metal matrix and carbon nanotubes

Proceedings of the National Academy of Sciences of Belarus Physical-Technical Series ◽

10.29235/1561-8358-2019-64-2-166-174 ◽

2019 ◽

Vol 64 (2) ◽

pp. 166-174

Author(s):

V. N. Pasovets ◽

V. A. Kovtun

Keyword(s):

Carbon Nanotubes ◽

Compressive Strength ◽

Composite Materials ◽

Root Mean Square ◽

Metal Matrix ◽

Pore Space ◽

Copper Matrix ◽

Ultimate Compressive Strength ◽

Mean Square ◽

Nanosized Filler

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.

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