Mechanical properties of ultra-hard nanocrystalline cubic boron nitride

Solozhenko, Vladimir L.; Bushlya, Volodymyr; Zhou, Jinming

doi:10.1063/1.5109636

Cited by 16 publications

(5 citation statements)

References 30 publications

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“…The hardness of dense compounds of the binary B–N system—cubic BN [ 2 ], rhombohedral B 13 N 2 [ 49 , 50 ] and tetragonal B 50 N 2 [ 51 ]—does not exceed H V = 62 Gpa for single-crystal cBN [ 4 ], i.e., they all belong to the group of superhard phases. Special mention should be given to nanocrystalline cBN [ 52 ], with Vickers hardness up to 85 Gpa [ 53 ], mainly due to the Hall–Petch effect, i.e., nanosize effect, which restricts dislocation propagation through the material.…”

Section: Binary Compoundsmentioning

confidence: 99%

Prediction of Novel Ultrahard Phases in the B–C–N System from First Principles: Progress and Problems

Solozhenko

Matar

2023

Materials

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The modern synthesis of superhard and, especially, ultrahard phases is a fascinating area of research that could lead to the design of new, industrially important materials. Computational methods built within the well-established quantum mechanics framework of density functional theory (DFT) play an important role in the search for these advanced materials and the prediction of their properties. The close relationship between the physical properties of carbon and boron nitride has led to particular interest in the B–C–N ternary system, characterized by the small radii of the elements, resulting in short interatomic distances and reduced volumes—the parameters being ‘recipes’ for very high hardness in three-dimensional structures. The purpose of this review is to provide a brief outline of recent developments and problems in predicting novel ultrahard carbon allotropes as well as binary and ternary compounds of the B–C–N system with particular emphasis on the analysis of the models used to evaluate the hardness of the theoretically predicted structures.

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Section: Binary Compoundsmentioning

confidence: 99%

Prediction of Novel Ultrahard Phases in the B–C–N System from First Principles: Progress and Problems

Solozhenko

Matar

2023

Materials

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“…With the grain size decrease, the hardness increases from H V ~40 GPa for microcrystalline c-BN up to 85 GPa for nano-c-BN, approaching that of diamond. The combination of nanosize and high purity also led to very high fracture toughness and wear resistance 109,112 . These recent examples of high-pressure synthesis of extremely hard bulk binderless nanomaterials based on diamond 93 and cubic boron nitride 109 have also inspired the search for new bulk nanocrystalline materials based on compounds of light elements that may enhance useful properties of their microcrystalline counterparts.…”

Section: Hall-petch Lawmentioning

confidence: 99%

High-pressure synthesis of superhard and ultrahard materials

Godec

Courac

Solozhenko

2019

Journal of Applied Physics

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A brief overview on high-pressure synthesis of superhard and ultrahard materials is presented in this tutorial paper. Modern high-pressure chemistry represents a vast exciting area of research which can lead to new industrially important materials with exceptional mechanical properties. This field is only just beginning to realize its huge potential, and the image of "terra incognita" is not misused. We focus on three facets of this expanding research field by detailing: (i) the most promising chemical systems to explore (i.e. "where to search"); (ii) the various methodological strategies for exploring these systems (i.e. "how to explore"); (iii) the technological and conceptual tools to study the latter (i.e. "the research tools"). These three aspects that are crucial in this research are illustrated by examples of the recent results on high pressure -high temperature synthesis of novel super-and ultrahard phases (orthorhombic γ-B 28 , diamond-like BC 5 , rhombohedral B 13 N 2 and cubic ternary B-C-N phases). Finally, some perspectives of this research area are briefly reviewed. superhard-and ultrahard materials is crucial 1 ), has a dimensionality of pressure, and defined as a hardness named after the type of diamond pyramid used for indentation (so-called Vickers, Knoop or Berkovich hardness, typically used for superhard materials).Superhard and ultrahard materials can be defined as having Vickers microhardness (H V ) exceeding 40 GPa and 80 GPa respectively 2, 3 . In addition to high hardness, they usually possess other unique properties such as compressional strength, shear resistance, large bulk moduli, high melting temperatures and chemical inertness. This combination of properties makes these materials highly desirable for a number of industrial applications. Historically, the first high-pressure experiments designed to produce materials for industrial use were carried out during the second half of the 20th century with the laboratory synthesis of superhard materials, namely, diamond 4, 5 and cubic boron nitride (c-BN or zb-BN to denote its zinc-blende structure) 6, 7 . Nowadays, the chemical industries linked to these materials are flourishing all over the world with an annual production of 3 000 million carats (1 carat = 0.2 g). Industrial applications of bulk superhard materials to date have been dominated by superabrasives, such as stone and concrete sawing, cutting and grinding tools, polishing tools, petroleum exploration mining, high speed machining of various engineering materials, etc. Recent achievements in search for novel superhard materials indicate that synthesis of phases -other than carbon allotropes, which are of primary interest to this manual -with hardness exceeding that of various forms of diamond (Knoop hardness 56-115 GPa for different hkl index planes of natural single-crystals 8 and 120-145 GPa for nanocrystalline diamond 9 ) is very unlikely 10 . At the same time, the hardness and mechanical properties of diamond-based materials themselves can still be improved by microstructure ...

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“…Boron nitride (BN) films have recently attracted much attention because of their unique structures. 1,2) The bonding phase, such as the sp 2 -and/or sp 3 -bonded phase, results in BN films with various electrical 3,4) and mechanical 5) properties. The sp 2 -bonded hexagonal BN (h-BN) provides a 2D material, [6][7][8][9] which can be used in advanced electronic devices as an insulating film.…”

Section: Introductionmentioning

confidence: 99%

Ion irradiation-induced sputtering and surface modification of BN films prepared by a reactive plasma-assisted coating technique

Matsuda

Hamano

Asamoto

et al. 2022

Jpn. J. Appl. Phys.

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Boron nitride (BN) films with a wide variety of nano-network structures (sp2–sp3 bonded) were prepared and their sputtering behaviors were investigated. BN films were formed using a reactive plasma-assisted coating technique. Fourier transform infrared spectroscopy (FT-IR) and nanoindentation analyses confirmed the presence of sp2- and sp3-bonded phases. Then, the thickness change by plasma exposure was studied for various BN films. Sputtered depth after the plasma exposure of the prepared BN films was lower than that of SiO2 films. While no clear change was observed in the FT-IR spectra after the plasma exposure, the leakage current and dielectric constant changed due to the surface modification. It was found that the modified layer underneath the sputtered surface contained the local defects which play a role as carrier trapping or hopping sites. The sputtering behavior analysis in combination with electrical measurements is a useful methodology for designing BN films.

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Mechanical properties of ultra-hard nanocrystalline cubic boron nitride

Cited by 16 publications

References 30 publications

Prediction of Novel Ultrahard Phases in the B–C–N System from First Principles: Progress and Problems

Prediction of Novel Ultrahard Phases in the B–C–N System from First Principles: Progress and Problems

High-pressure synthesis of superhard and ultrahard materials

Ion irradiation-induced sputtering and surface modification of BN films prepared by a reactive plasma-assisted coating technique

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