Comparative Study of the Mechanical and Tribological Characteristics of Fe–Cu–Ni–Sn Composites with Different CrB2 Content under Dry and Wet Friction

Comparative Study of the Mechanical and Tribological Characteristics of Fe–Cu–Ni–Sn Composites with Different CrB2 Content under Dry and Wet Friction

The structure, phase composition, hardness, and elasticity modulus of sintered Fe–Cu–Ni–Sn–CrB 2 composites and their tribological properties under dry and wet friction have been studied by X-ray diffraction, scanning electron microscopy, microindentation, and tribological testing. The obtained resu...

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Bibliographic Details
Published in:Journal of superhard materials Vol. 43; no. 1; pp. 52 - 64
Main Authors: Mechnik, V. A., Bondarenko, N. A., Kolodnitskyi, V. M., Zakiev, V. I., Zakiev, I. M., Gevorkyan, E. S., Kuzin, N. O., Yakushenko, O. S., Semak, I. V.
Format: Journal Article
Language:English
Published: Moscow Pleiades Publishing 2021
Springer Nature B.V
Subjects:
Chemistry
Chemistry and Materials Science
Comparative studies
Composite materials
Copper
Diamonds
Dry friction
Elasticity
Friction
Hardness
Iron
Mechanical properties
Microhardness
Nickel
Phase composition
Physical Chemistry
Production
Properties
Structure
Tin
Tribology
Wear mechanisms
Wear rate
Wear resistance
hardness
composite
tribological tests
wear resistance
elasticity modulus
concentration
dry and wet friction
structure
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Summary:The structure, phase composition, hardness, and elasticity modulus of sintered Fe–Cu–Ni–Sn–CrB 2 composites and their tribological properties under dry and wet friction have been studied by X-ray diffraction, scanning electron microscopy, microindentation, and tribological testing. The obtained results have demonstrated that the microstructure and mechanical and tribological properties of these composites depend on the CrB 2 additive content. The Fe–Cu–Ni–Sn–CrB 2 composites incorporate the α-Fe, γ-Fe, and Cu phases and a certain fraction of the crystalline Cu 9 NiSn 3 , NiSn 3 , and CrB 2 phases. The hardness and elasticity modulus of these composites are almost independent of the friction medium (dry or wet), and the friction force and the wear rate are variable. The Fe–Cu–Ni–Sn–CrB 2 composites are superior to the Fe–Cu–Ni–Sn composites in their mechanical and tribological properties. The addition of 2 wt % of CrB 2 to the 51Fe–32Cu–9Ni–8Sn composite has decreased the friction force from 220 to 170 mN and the wear rate from 7.41 × 10 –2 to 3.41 × 10 –2 mm 3 /(N m) under dry friction and, respectively, from 200 to 140 mN and from 8.19 × 10 –2 to 4.10 × 10 –2 mm 3 /(N m) under wet friction. A further growth in the CrB 2 content in the composites leads to an increase in the wear rate. The mechanism of increase in the wear resistance of the composite containing 2 wt % of CrB 2 as compared to the initial composite implies the formation of a more fine-grained structure with an optimal combination of the hardness and elasticity modulus. The Fe–Cu–Ni–Sn–CrB 2 composites can be used as a material for the matrix of composite diamond-containing materials subjected to strong wear.
ISSN:1063-4576
1934-9408
DOI:10.3103/S1063457621010044