Enhanced strength of nano-polycrystalline diamond by introducing boron carbide interlayers at the grain boundaries

Zhao, Bo; Zhang, Shengya; Duan, Shuai; Song, Jingyan; Li, Xiangjun; Yang, Bingchao; Chen, Xin; Wang, Chao; Yi, Wencai; Wang, Zhixiu; Liu, Xiaobing

doi:10.1039/c9na00699k

Cited by 7 publications

(9 citation statements)

References 42 publications

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“…The hardness values were calculated by the equation H v = d −2 , where F and d represent the loading force and the mean value of the lengths of diagonals. [ 47,48 ] Standard DAC cell and PeCu cell with 200 µm flat culets were used for the in situ pressure‐dependent Raman and electrical conductivity measurements under compression of pressures ranging ambient to 61 GPa. Rhenium gaskets were pre‐indented to 25–30 µm in thickness.…”

Section: Methodsmentioning

confidence: 99%

Fabrication of Alkali Metal Boride: Honeycomb‐Like Structured NaB₄ with High Hardness and Excellent Electrical Conductivity

Zhao

Wang

et al. 2021

Adv Funct Materials

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The design and fabrication of novel hard materials with excellent electrical conductivity is attractive in scientific and technological application under extreme conditions. Metal borides have brought substantial interest for decades in material science because of their strong covalent BB bonding network for intrinsic incompressibility and MM bonding for electron transportation. Here the successful synthesis of a novel hard alkali metal boride as NaB4 with high thermal stability (873 K) and metallic behaviors is reported. The relatively low synthetic P/T conditions (lowest at 1.5 GPa and 1000 K) enable the easy fabrication of large bulk materials (several centimeters in diameter). The studies reveal that the Vickers hardness value of NaB4 can reach up to 26 GPa, associated with superior incompressibility along (001) direction of honeycomb‐like boron structure that exhibits the highest shear modulus up to 96 GPa for borides. The NaB4 structure undergoes an interesting metallic‐semiconducting transition under compression up to 61 GPa. This new form of hard metal boride material with pressure‐tunable electrical properties enables the development of industrial applications as future electrical devices.

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Section: Methodsmentioning

confidence: 99%

Fabrication of Alkali Metal Boride: Honeycomb‐Like Structured NaB₄ with High Hardness and Excellent Electrical Conductivity

Zhao

Wang

et al. 2021

Adv Funct Materials

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“…To our best knowledge, the NPD samples in the present study exhibit the highest hardness in all the reported NPD materials synthesized by sintering nano/micro-sized diamond crystals under high pressure and high temperature. [13,15] More important, they are significantly harder than SCD and those NPD synthesized from fullerene and glassy carbon by HPHT. [6] For the synthesized NPD samples, more dislocations were created in the nanocrystals of SAND-1 sample during HPHT but the corresponding hardness is the lowest, indicating that the dislocations/structural defects in NPD is not responsible to the high hardness.…”

Section: Weakening Effects Of Nano Amorphous Carbonmentioning

confidence: 99%

“…This could also be used to understand why the sintered NPD composite could exhibit superhardness when a relatively soft component is added during HPHT sintering. [15,17]…”

Section: Weakening Effects Of Nano Amorphous Carbonmentioning

confidence: 99%

Super Strengthening Nano‐Polycrystalline Diamond through Grain Boundary Thinning

Yao

Shen

Guo

et al. 2023

Adv Funct Materials

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Introducing nanostructures into diamonds is quite appealing for the synthesis of superhard materials with superior properties. However, as the grain size decreases to nanoscale, grain boundary effects become crucial yet complicated in the nanopolycrystalline diamond (NPD), making it challenging to tailor nanostructures. Here, atomistic simulations are combined with experiment to demonstrate a strengthening strategy for the sintered NPD by introducing thin amorphous grain boundary (AGB). The additive of small percentage of fullerene into precursors during sintering can significantly reduce crushed amorphous‐like nanodomains in diamond nanocrystals, leading to the formation of thin AGB. Such sintered NPD exhibits a significant hardness and fracture toughness enhancement, exceeding that of single crystal diamonds. These atomistic simulations show that upon straining the plastic deformation, crack initiation and propagation in NPD is AGB thickness dependent, and thin AGB can reduce crack nucleation and block crack propagation, well explaining the experimental observations. This study indicates that grain boundary modulation provides a promising approach for rational designs of high‐performance superhard materials with desired high strength.

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“…HPHT is the more effective method for preparation of AlB 2type TMdBs. HPHT can help to cross the high energy barrier and provide rapid cooling and quenching to retain metastable phase [76,[85][86][87][88][89][90][91][92]. Moreover, HP is advanced in forming bulk materials with high density.…”

Section: Synthesis and Basic Mechanical And Physical Propertiesmentioning

confidence: 99%

Mechanical properties and multifunctionality of AlB₂-type transition metal diborides ^*

Li¹,

Zhao²,

Wang³

et al. 2022

J. Phys.: Condens. Matter

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Transition metal diborides (TMdBs, P6/mmm, AlB2-type) have attracted much attention for decades, due to TMdBs can be conductors, superconductors, magnetism materials, and catalysts. The layered structure caused by borophene subunit is the source of functions, and also make TMdBs be a potential bank of Mbene. However, TMdBs also exhibit high hardness which is not supposed to have in layered structure. The high hardness of TMdBs arise from covalent bonds of Boron-boron (B-B) and strong p-d orbit hybridization of B and TM. While, strong B-TM bonds will eliminate the layered structure which may damage the functional properties. Understanding the basic mechanism of hardness and functional is significant to achieve optimal TMdBs. In this work, the basic properties of TMdBs include hardness, superconductor, and catalytic property are summarized. It can be found that Youngs modulus (E) and Shear modulus (G) are beneficial for the hardness of TMdBs and Poisson ratio is the opposite. The increasing of atomic radius of TM brings the improvement for the hardness of TMdBs before it reaches the highest value 1.47 Å, beyond which hardness decreases. Besides, TMdBs also have excellent activity comparable with some noble metal for hydrogen evolution reaction, which is closely related with d-band center. More importantly, higher valence electron concentrations were found to be adverse for hardness and superconductivity of TMdBs and greatly affect their catalytic properties. This review is of guiding significance for the further explore the relation between structures and properties of TMdBs.

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Enhanced strength of nano-polycrystalline diamond by introducing boron carbide interlayers at the grain boundaries

Abstract: Polycrystalline diamond with high mechanical properties and excellent thermal stability plays an important role in industry and materials science.

Cited by 7 publications

References 42 publications

Fabrication of Alkali Metal Boride: Honeycomb‐Like Structured NaB₄ with High Hardness and Excellent Electrical Conductivity

Fabrication of Alkali Metal Boride: Honeycomb‐Like Structured NaB₄ with High Hardness and Excellent Electrical Conductivity

Super Strengthening Nano‐Polycrystalline Diamond through Grain Boundary Thinning

Mechanical properties and multifunctionality of AlB₂-type transition metal diborides ^*

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Enhanced strength of nano-polycrystalline diamond by introducing boron carbide interlayers at the grain boundaries

Abstract: Polycrystalline diamond with high mechanical properties and excellent thermal stability plays an important role in industry and materials science.

Cited by 7 publications

References 42 publications

Fabrication of Alkali Metal Boride: Honeycomb‐Like Structured NaB4 with High Hardness and Excellent Electrical Conductivity

Fabrication of Alkali Metal Boride: Honeycomb‐Like Structured NaB4 with High Hardness and Excellent Electrical Conductivity

Super Strengthening Nano‐Polycrystalline Diamond through Grain Boundary Thinning

Mechanical properties and multifunctionality of AlB2-type transition metal diborides *

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Fabrication of Alkali Metal Boride: Honeycomb‐Like Structured NaB₄ with High Hardness and Excellent Electrical Conductivity

Fabrication of Alkali Metal Boride: Honeycomb‐Like Structured NaB₄ with High Hardness and Excellent Electrical Conductivity

Mechanical properties and multifunctionality of AlB₂-type transition metal diborides ^*