Effect of La2O3 on electrical friction and wear properties of Cu-graphite composites

Mo, Fei; Feng, Yi; Chen, Yangming; Wang, Yuqing; Qian, Gang; Dou, Yusheng; Zhang, Xuebin

doi:10.1016/s1002-0721(14)60421-x

Cited by 16 publications

(8 citation statements)

References 20 publications

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“…The investigation of electrical resistance of the samples revealed a rise in their values for composite samples. The addition of graphite and n-La 2 O 3 to the composite composition leads to an increase in electrical resistance because of (1) higher electrical resistivity of graphite/La 2 O 3 (100 Ωm) than of pure copper [6], (2) the formation of discontinuity, and decrease of conduction path in samples.…”

Section: Microstructure Hardness and Electrical Resistancementioning

confidence: 99%

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The behavior of Cu/Cu-C-La2O3 nanocomposites prepared by spark plasma sintering: physical and electrochemical properties

Amirjan¹,

Bozorg²,

Shadkar³

2021

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In the present paper, the effect of La2O3 nanoparticle was studied on the physical and electrochemical properties of Cu/Cu-C contacts. The nanocomposite materials were prepared using different La2O3 contents (1.0-2.0 wt.%) processed by the spark plasma sintering method. The microstructural observations, density, hardness, electrical resistance measurements, and electrochemical behavior characterization were conducted. The results showed that the hardness, electrical resistance, and corrosion resistance of composites increase with the addition of La2O3 nanoparticle.

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Section: Microstructure Hardness and Electrical Resistancementioning

confidence: 99%

“…Graphite is soft and has low strength. So many researches try to improve the properties of Cu-graphite composites [2,5,6]. It has been reported that the sinterability of the composite can be improved by an activated sintering process by adding into small amounts of active elements.…”

Section: Introductionmentioning

confidence: 99%

The behavior of Cu/Cu-C-La2O3 nanocomposites prepared by spark plasma sintering: physical and electrochemical properties

Amirjan¹,

Bozorg²,

Shadkar³

2021

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“…Gadolinia (Gd 2 O 3 ) and many other rare earth oxides are more attractive as dispersive phases than Al 2 O 3 for Cu matrix composites due to their excellent thermodynamic stability [ 11 , 12 , 13 , 14 ]. Moreover, those rare earth elements show a low diffusivity and solubility in the metal matrix because of their larger atomic radii, consequently, could improve the microstructural stability of the metal matrix against coarsening [ 15 , 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Electroless Cu Plating Ti3AlC2 Particles on Microstructure and Properties of Gd2O3/Cu Composites

Cao

Zhan

2022

Materials

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Ti3AlC2 presents a hexagonal layered crystal structure and bridges the gap between metallic and ceramic properties, and Gadolinia (Gd2O3) has excellent thermodynamic stability, which make them potentially attractive as dispersive phases for Cu matrix composites. In this paper, Cu@Ti3AlC2-Gd2O3/Cu composites, Ti3AlC2-Gd2O3/Cu composites, and Gd2O3/Cu composites were prepared by electroless Cu plating, internal oxidation, and vacuum hot press sintering. The microstructure and the effect of the Cu plating on the properties of the Cu@Ti3AlC2-Gd2O3/Cu composites were discussed. The results showed that a Cu plating with a thickness of about 0.67 μm was successfully plated onto the surface of Ti3AlC2 particles. The ex situ Ti3AlC2 particles were distributed at the Cu grain boundary, while the in situ Gd2O3 particles with a grain size of 20 nm were dispersed in the Cu grains. The electroless Cu plating onto the surface of the Ti3AlC2 particles effectively reduces their surfactivity and improves the surface contacting state between the Cu@Ti3AlC2 particles and the Cu matrix, and reduces electron scattering, so that the tensile strength reached 378.9 MPa, meanwhile, the electrical conductivity and elongation of the Cu matrix composites was maintained at 93.6 IACS% and 17.6%.

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“…Gadolinia (Gd 2 O 3 ) and many other rare earth oxides show a more excellent thermodynamic stability comparing with Al 2 O 3 , which make them potentially attractive as dispersive phases for copper matrix composites [ 18 , 19 , 20 , 21 , 22 , 23 , 24 ]. Furthermore, these rare earth elements show a low diffusivity and solubility in the metal matrix because their atomic radii are larger than that of copper; consequently, they improve the microstructural stability against coarsening.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution and Properties of an In-Situ Nano-Gd2O3/Cu Composite by Powder Metallurgy

Cao

Zhan

2021

Materials

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Gadolinia (Gd2O3) is potentially attractive as a dispersive phase for copper matrix composites due to its excellent thermodynamic stability. In this paper, a series of 1.5 vol% nano-Gd2O3/Cu composites were prepared via an internal oxidation method followed by powder metallurgy in the temperature range of 1123–1223 K with a holding time of 5–60 min. The effects of processing parameters on the microstructure and properties of the composites were analyzed. The results showed that the tensile strength and conductivity of the nano-Gd2O3/Cu composite have a strong link with the microporosity and grain size, while the microstructure of the composite was determined by the sintering temperature and holding time. The optimal sintering temperature and holding time for the composite were 1173 K and 30 min, respectively, under which a maximum ultimate tensile strength of 317 MPa was obtained, and the conductivity was 96.8% IACS. Transmission electron microscopy observations indicated that nano-Gd2O3 particles with a mean size of 76 nm formed a semi-coherent interface with the copper matrix. In the nano-Gd2O3/Cu composite, grain-boundary strengthening, Orowan strengthening, thermal mismatch strengthening, and load transfer strengthening mechanisms occurred simultaneously.

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Effect of La2O3 on electrical friction and wear properties of Cu-graphite composites

Cited by 16 publications

References 20 publications

The behavior of Cu/Cu-C-La2O3 nanocomposites prepared by spark plasma sintering: physical and electrochemical properties

The behavior of Cu/Cu-C-La2O3 nanocomposites prepared by spark plasma sintering: physical and electrochemical properties

Effect of Electroless Cu Plating Ti3AlC2 Particles on Microstructure and Properties of Gd2O3/Cu Composites

Microstructure Evolution and Properties of an In-Situ Nano-Gd2O3/Cu Composite by Powder Metallurgy

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