Tribological behaviour of Cu based materials produced by mechanical milling/alloying and spark plasma sintering

Pellizzari, M.; Cipolloni, Giulia

doi:10.1016/j.wear.2016.11.050

Cited by 23 publications

(7 citation statements)

References 39 publications

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“…In [ 36 ], hardness up to 2 GPa and relative density close to 92% were reported for Cu-10 wt% TiB 2 composites. Present authors also showed excellent wear resistance for mechanically milled and SPS’ed Cu + 0.5 wt.%TiB 2 [ 37 ].…”

Section: Introductionmentioning

confidence: 69%

“…Another remarkable feature that should be pointed out is the white region located at former particles’ boundaries ( Figure 6 e), absent in MMC-5′ and MMC-80′. These white areas are portions of the Cu matrix undergoing re-melting or re-crystallization during sintering [ 37 , 47 ], due to the local temperature increase induced by the Joule effect [ 4 , 44 ].…”

Section: Resultsmentioning

confidence: 99%

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Spark Plasma Sintering of Copper Matrix Composites Reinforced with TiB2 Particles

Pellizzari

Cipolloni

2020

Materials

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The aim of this study is to fabricate a Cu-0.5wt%TiB2 composite by mechanical alloying (MA) and spark plasma sintering (SPS). Increasing the milling time, the powders are subjected firstly to a severe flattening process and then to intense welding, which promotes the refinement of TiB2 particles, their uniform dispersion in the metal matrix, and the adhesion between the two constituents. Sintered metal matrix composites (MMC) exhibit density values between 99 and 96%, which are generally decreased by increasing milling time in view of the stronger strain hardening. On the other side, the hardness increases with milling time due to the refinement of TiB2 particles and their improved distribution. The hardness of MMC is three times higher (225 HV0.05) than the starting hardness of atomized copper (90 HV0.05). Tensile tests show a loss of ductility, but ultimate tensile strength has been increased from 276 MPa of atomized copper to 489 MPa of MMC milled for 240 min. The thermal conductivity of MMC is comparable to that of atomized copper (300 W/mK), i.e., much higher than that of the commercial Cu-Be alloy (Uddeholm Moldmax HH, 106 W/mK) typically used for tooling applications.

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Section: Introductionmentioning

confidence: 69%

Section: Resultsmentioning

confidence: 99%

Spark Plasma Sintering of Copper Matrix Composites Reinforced with TiB2 Particles

Pellizzari

Cipolloni

2020

Materials

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“…Two types of reinforcements are commonly used to improve the wear resistance of copper in the current industrial field. The first is by adding hard and wear-resistant ceramic particles such as Al 2 O 3 [3], TiB 2 [4], B 4 C [5], TiB 2 , SiC [6] and Zr 2 O 3 . For example, the hardness and wear resistance of Al 2 O 3 dispersion-strengthened copper prepared by an internal oxidation method are greatly improved.…”

Section: Introductionmentioning

confidence: 99%

Effect of Electroless Coatings on the Mechanical Properties and Wear Behavior of Oriented Multiwall Carbon Nanotube-Reinforced Copper Matrix Composites

et al. 2021

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The effects of electroless coatings on the microstructure and composition of the interface between multi-walled carbon nanotubes (MWCNTs) and a Cu matrix and the mechanical properties and wear behavior of the resulting copper matrix composites were investigated. Ni and Cu coatings were electrolessly plated on MWCNTs and mixed subsequently with copper powder. Then copper matrix composites were prepared by sintering, hot extrusion and cold drawing processes. The results showed that MWCNTs were straight, long, uniformly dispersed and aligned in the composites. The Ni coating is more continuous, dense and complete than a Cu coating. The tensile strength, compressive strength, microhardness and tribological properties of Ni@MWCNTs/Cu composite along the drawing direction were enhanced most. The ultimate tensile strength and compressive strength were 381 MPa and 463 MPa, respectively. The friction coefficient and wear rate were reduced by 59% and 77%, respectively, compared with pure Cu samples. This study provides a new insight into the regulation of tribological properties of composites by their interface.

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“…Copper-and silver-matrix composites are commonly used as contact materials of current-carrying friction pairs in electrical contacts, motor excitation systems, electromagnetic gun orbits, rail transport bow net systems, microelectronics and electrical control systems [1][2][3][4]. These composites have a perfect combination of high strength and conductivity by adding a small amount of dispersed particles such as Al 2 O 3 , SiO 2 , SiC, TiB 2 , and MgO.…”

Section: Introductionmentioning

confidence: 99%

Effect of TiB₂ particle size on the material transfer behaviour of Cu–TiB₂ composites

Guo

Song

Wang

et al. 2020

Materials Science and Technology

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Cu-5.8vol.-%TiB2 composites reinforced with different sized TiB2 particles were prepared by spark plasma sintering (SPS). The arc erosion resistance was examined using a JF04C electrical contact instrument. The results indicate that the TiB2 particle size and contact currents have important effects on the material transfer mode. Both lower mass loss and relative mass transfer was observed in the Cu-5.8vol.-%TiB2 composites reinforced with fine TiB2 particles (10 um, 30 um) compared to those with coarse TiB2 particles (70 um, 110 um). The investigation and analysis of the microstructure and arc erosion mechanism show uniform distribution of fine TiB2 particles in the copper matrix can significantly improve the viscosity of the molten pool and decrease the splashing of molten Cu.

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Tribological behaviour of Cu based materials produced by mechanical milling/alloying and spark plasma sintering

Cited by 23 publications

References 39 publications

Spark Plasma Sintering of Copper Matrix Composites Reinforced with TiB2 Particles

Spark Plasma Sintering of Copper Matrix Composites Reinforced with TiB2 Particles

Effect of Electroless Coatings on the Mechanical Properties and Wear Behavior of Oriented Multiwall Carbon Nanotube-Reinforced Copper Matrix Composites

Effect of TiB₂ particle size on the material transfer behaviour of Cu–TiB₂ composites

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Tribological behaviour of Cu based materials produced by mechanical milling/alloying and spark plasma sintering

Cited by 23 publications

References 39 publications

Spark Plasma Sintering of Copper Matrix Composites Reinforced with TiB2 Particles

Spark Plasma Sintering of Copper Matrix Composites Reinforced with TiB2 Particles

Effect of Electroless Coatings on the Mechanical Properties and Wear Behavior of Oriented Multiwall Carbon Nanotube-Reinforced Copper Matrix Composites

Effect of TiB2 particle size on the material transfer behaviour of Cu–TiB2 composites

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Effect of TiB₂ particle size on the material transfer behaviour of Cu–TiB₂ composites