Superhard Copper Matrix Composite Reinforced by Ultrafine Boron for Wear-Resistant Bearings

Zhao, Shuo; Wu, Yuying; Sun, Zuxin; Zhou, Bo; Liu, Xiangfa

doi:10.1021/acsanm.8b01299

Cited by 11 publications

(4 citation statements)

References 31 publications

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“…Diborides (TMB 2 ) and transition metal tetraborides (TMB 4 ) have been widely investigated over the last years . However, the reported Vickers hardness of TMB 2 or TMB 4 is difficult to meet the requirement of superhard material . Naturally, the Vickers hardness of TMBs mainly relies on the shorter and network covalent bonds.…”

Section: Introductionmentioning

confidence: 99%

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Influence of alloying elements on the mechanical and thermodynamic properties of ZrB₁₂ceramics from first‐principles calculations

Pan

Lin

2020

Int J of Quantum Chemistry

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Although ZrB 12 is a promising advanced material because of the boron cuboctahedron cages, the hardness of ZrB 12 remains controversy. Here, we apply first-principles calculations to study the influence of transition metals (4d-and 5d-) on the hardness and thermodynamic properties of ZrB 12 . The calculated hardness of ZrB 12 is 32.9 GPa, which is in good agreement with the previous theoretical result. Importantly, the calculated hardness of Re-doped ZrB 12 is up to 40.0 GPa, which is a potential superhard material. The essential reason is that the alloying element of Re enhances the localized hybridization of B B and Zr B atoms, and then forms the strong B B covalent bond and Zr B bond. The result is well demonstrated by the chemical bonding and lattice parameter. Here, our work shows that the alloying elements of Nb, Mo, and Re enhance the thermodynamic properties of ZrB 12 . The Debye temperature of Re-doped ZrB 12 is 1225.2 K, which is larger than that of the parent ZrB 12 (1213.5 K). K E Y W O R D S borides, elastic modulus, first-principles calculations, hardness, thermodynamic properties, ZrB 12 1 | INTRODUCTION Hard and superhard materials (≥40 GPa) are very important industrial materials, which are widely used in various industrial applications because of their high hardness, ultracompressibility, high melting point, and excellent thermal stability etc. [1-10] In comparison to diamond and boron nitride (c-BN), the transition metal borides (TMBs) are attractive potential superhard materials because of the network and shorter covalent bonding such as B B covalent bond and TM B bond. [11][12][13][14][15][16][17][18][19] Diborides (TMB 2 ) and transition metal tetraborides (TMB 4 ) have been widely investigated over the last years. [20][21][22][23][24] However, the reported Vickers hardness of TMB 2 or TMB 4 is difficult to meet the requirement of superhard material. [25][26][27][28][29] Naturally, the Vickers hardness of TMBs mainly relies on the shorter and network covalent bonds. In other words, the high concentration of boron plays a crucial role in Vickers hardness of TMBs. Among these TMBs, it is obvious that the transition metal dodecaborides (TMB 12 ) are potential superhard materials in comparison to TMB 2 and TMB 4 .Recently, ZrB 12 has evoked great interest because of the high concentration of boron and the network B B covalent bonds. [30] This dodecaboride is composed of the boron cuboctahedron cage (24 atoms) and 12-coordinate transition metals at the center of cubic structure. This structural feature is possible to enhance the Vickers hardness of TMBs. However, the Vickers hardness of ZrB 12 remains controversy. Korozlu et al. have found that the calculated Vickers hardness of ZrB 12 is 40.1 GPa, which is believed to a potential superhard material. [31] However, the recent works have shown that the Vickers hardness of ZrB 12 is 35.4 GPa by Chen et al. [32] and 29.3 GPa by Li et al., [33] which are different from Korozlu's result. On the other hand, even if the Vickers hardness of ZrB 12 remains...

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Section: Introductionmentioning

confidence: 99%

“…[20][21][22][23][24] However, the reported Vickers hardness of TMB 2 or TMB 4 is difficult to meet the requirement of superhard material. [25][26][27][28][29] Naturally, the Vickers hardness of TMBs mainly relies on the shorter and network covalent bonds. In other words, the high concentration of boron plays a crucial role in Vickers hardness of TMBs.…”

mentioning

confidence: 99%

Influence of alloying elements on the mechanical and thermodynamic properties of ZrB₁₂ceramics from first‐principles calculations

Pan

Lin

2020

Int J of Quantum Chemistry

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“…2b) or alloying element content (Fig. 2c), and is even higher than some Cu matrix composites, such as B-Cu composite 43 , Cu-30% SiC composite 44 , Cu-50% SiC composite 44 , Cu-MoS 2 -WC composite 45 , amorphous C/Cu composite 46 , graphene/Cu composite 47 and Cu-carbon nanotube composite 48 . Moreover, this hardness value (10.8 GPa) is more than double the highest hardness (4.698 GPa) for microstructurally strengthened copper expected by the classic boundary strengthening analysis (see Supplementary Information).…”

Section: Hardness and The Strengthening Mechanismmentioning

confidence: 90%

Bamboo-like dual-phase nanostructured copper composite strengthened by amorphous boron framework

Gao

Zhang

et al. 2023

Nat Commun

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Grain boundary engineering is a versatile tool for strengthening materials by tuning the composition and bonding structure at the interface of neighboring crystallites, and this method holds special significance for materials composed of small nanograins where the ultimate strength is dominated by grain boundary instead of dislocation motion. Here, we report a large strengthening of a nanocolumnar copper film that comprises columnar nanograins embedded in a bamboo-like boron framework synthesized by magnetron sputtering co-deposition, reaching the high nanoindentation hardness of 10.8 GPa among copper alloys. The boron framework surrounding copper nanograins stabilizes and strengthens the nanocolumnar copper film under indentation, benefiting from the high strength of the amorphous boron framework and the constrained deformation of copper nanocolumns confined by the boron grain boundary. These findings open a new avenue for strengthening metals via construction of dual-phase nanocomposites comprising metal nanograins embedded in a strong and confining light-element grain boundary framework.

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“…As we reported before, both boron nanotubes 20 and boron spheres 2 have been obtained via copper medium by controlling the cooling rate and boron content, thus synthesis of boron nanosheets by using copper as an ideal carrier has been proposed in this work. In order to decrease the initial size of boron and facilitate grinding, boron/copper alloys were atomized into powders, through which copper matrix composite strengthened by nanoscale boron has been prepared 21 . Here, a large number of boron nanosheets crystallized in copper by solid diffusion, coupling with a high temperature in a vacuum hot pressure sintering furnace.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Boron Nanosheets in Copper Medium

Zhao

Zhou

et al. 2019

Sci Rep

Self Cite

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Boron has a tendency to form bulk structures due to its unique electron-deficient property, so it’s hard for boron to form sheets in large quantities. Here, we report a novel method for the preparation of boron nanosheets in large quantities by copper medium. The method mainly includes mechanical exfoliation, recombination and extraction. A large number of boron nanosheets with a height of below 6 nm have been prepared in this work. X-ray photoelectron spectroscopy and Raman spectroscopy results confirmed that the nanosheets possess the characteristics of α-rhombohedra boron and β-rhombohedra boron with a high content of boron. Hexagonal and rhombic sheets have been observed and two different growth processes are revealed successfully, which are also the basic structures of boron nanosheets. An interesting phenomenon also have been discovered that high density nanotwins exist in β-Rhombohedra boron sheets and it might stimulate more interest in growth of nanomaterials.

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Superhard Copper Matrix Composite Reinforced by Ultrafine Boron for Wear-Resistant Bearings

Cited by 11 publications

References 31 publications

Influence of alloying elements on the mechanical and thermodynamic properties of ZrB₁₂ceramics from first‐principles calculations

Influence of alloying elements on the mechanical and thermodynamic properties of ZrB₁₂ceramics from first‐principles calculations

Bamboo-like dual-phase nanostructured copper composite strengthened by amorphous boron framework

Synthesis of Boron Nanosheets in Copper Medium

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Superhard Copper Matrix Composite Reinforced by Ultrafine Boron for Wear-Resistant Bearings

Cited by 11 publications

References 31 publications

Influence of alloying elements on the mechanical and thermodynamic properties of ZrB12ceramics from first‐principles calculations

Influence of alloying elements on the mechanical and thermodynamic properties of ZrB12ceramics from first‐principles calculations

Bamboo-like dual-phase nanostructured copper composite strengthened by amorphous boron framework

Synthesis of Boron Nanosheets in Copper Medium

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Influence of alloying elements on the mechanical and thermodynamic properties of ZrB₁₂ceramics from first‐principles calculations

Influence of alloying elements on the mechanical and thermodynamic properties of ZrB₁₂ceramics from first‐principles calculations