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Ultrahard and stable nanostructured cubic boron nitride from hexagonal boron nitride
Ceramics International, 2020Abstract Cubic boron nitride (cBN), a typical superhard material, has garnered significant interest for both fundamental scientific research and technical applications. Here, nanostructured cBN with high-density nanotwins and stacking faults was synthesized by rapid quenching using hexagonal boron nitride (hBN) as the starting material at a moderate ...
Hao Liang +8 more
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Diamond and Related Materials, 2000
Abstract The use of Raman spectroscopy, and in particular Raman line shifts, to measure stress in diamond and nitrides such as gallium nitride (GaN), is well known. In both diamond and GaN the application is principally to study stresses in thin films and at the substrate–thin film interface.
R.M. Erasmus, J.D. Comins, M.L. Fish
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Abstract The use of Raman spectroscopy, and in particular Raman line shifts, to measure stress in diamond and nitrides such as gallium nitride (GaN), is well known. In both diamond and GaN the application is principally to study stresses in thin films and at the substrate–thin film interface.
R.M. Erasmus, J.D. Comins, M.L. Fish
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Synthesis of Cubic Boron Nitride by Decomposition of Magnesium Boron Nitride
Journal of the American Ceramic Society, 1992Cubic boron nitride ( c ‐BN) was synthesized by the decomposition of Mg 3 BN 3 under high pressure and high temperature.
Satoshi Nakano +2 more
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Boron suboxide: As hard as cubic boron nitride
Applied Physics Letters, 2002The Vickers hardness of boron suboxide single crystals was measured using a diamond indentation method. Under a loading force of 0.98 N, our test gave an average Vickers hardness of 45 GPa. The average fracture toughness was measured as 4.5 MPa m1/2. We also measured the hardness of the cubic boron nitride and sapphire single crystals for comparison ...
Duanwei He +5 more
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ChemistrySelect, 2017
Abstract Periodic mesoporous hexagonal boron nitride was investigated as a precursor for nanoscale forms of cubic boron nitride. Cubic boron nitride (c‐BN) nanocrystals were obtained at a pressure of 14 GPa and a temperature of 1300 °C.
Manik Mandal +8 more
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Abstract Periodic mesoporous hexagonal boron nitride was investigated as a precursor for nanoscale forms of cubic boron nitride. Cubic boron nitride (c‐BN) nanocrystals were obtained at a pressure of 14 GPa and a temperature of 1300 °C.
Manik Mandal +8 more
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Shock compression of cubic boron nitride
Journal of Applied Physics, 2009Hugoniot measurements have been performed on high-purity cubic boron nitride polycrystals in the pressure range up to 296GPa using a two-stage light-gas gun. Hugoniot parameters have been measured by a line reflection method and Fabry–Pérot velocimetry.
Nobuaki Kawai +4 more
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1999
Cubic BN (c-BN) is a compound crystallizing in the zinc-blende structure. It is the lightest among the III–V family. It possesses many unique phySiCal properties like extreme hardness, high melting point, high thermal conductivity, large band-gap energy, low dielectric constant, and high chemical stability. If the problems of crystal growth are solved,
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Cubic BN (c-BN) is a compound crystallizing in the zinc-blende structure. It is the lightest among the III–V family. It possesses many unique phySiCal properties like extreme hardness, high melting point, high thermal conductivity, large band-gap energy, low dielectric constant, and high chemical stability. If the problems of crystal growth are solved,
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Activating deformation twinning in cubic boron nitride
Nature MaterialsDeformation twinning, a phenomenon primarily documented within metallic systems, has remained essentially unexplored in covalent materials due to the formidable challenges posed by their inherent extreme hardness and brittleness. Here, by employing a five-degree-of-freedom nano-manipulation stage inside a transmission electron microscope, we reveal a ...
Yeqiang Bu +16 more
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Grinding with Cubic Boron Nitride
1974Beginning with a comparison of various abrasives and their mechanisms of wear, the specific problems when grinding high-speed steel with cubic boron nitride cup wheels are discussed. The necessary truing and dressing of the grinding section before the first usage is given special attention, because these preparations have an important effect on ground ...
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Cubic boron nitride - diamond mixed crystals
Materials Research Bulletin, 1981Mixed crystals of diamond and cubic boron nitride were obtained by the direct phase transformation at a pressure of 14.0 GPa and in temperature about 3300°K of mixed crystals of graphite and hexagonal boron nitride. The crystals, which can be described by the formula (BN)xC1−x, 0 < x < 1, possess sphalerite structure and show short range order ...
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