Synthesis of cubic boron nitride from amorphous boron nitride containing oxide impurity using Mg–Al alloy catalyst solvent

Singhal, Sunil; Park, Jun Kue

doi:10.1016/j.jcrysgro.2003.08.068

Cited by 14 publications

(11 citation statements)

References 12 publications

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“…Analogous to c-BN, w-BN is also tetrahedrally coordinated and is a candidate for superhard materials. When amorphous BN (a-BN) is considered, regrettably, its atomic structure and properties are not as clear as those of the crystalline phases in spite of numerous investigations [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Since the physical, chemical, mechanical and electronic properties of a-BN will correlate with its bonding natures, it is truly important to have an atomistic level description of a-BN to understand its properties in details and to outline its possible technological applications.…”

Section: Introductionmentioning

confidence: 99%

Hexagonal nanosheets in amorphous BN: A first principles study

Durandurdu

2015

Journal of Non-Crystalline Solids

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Section: Introductionmentioning

confidence: 99%

Hexagonal nanosheets in amorphous BN: A first principles study

Durandurdu

2015

Journal of Non-Crystalline Solids

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“…The effect of oxygen/B 2 O 3 on the phase transformation of h-BN to c-BN at high pressures has been studied extensively [ 37 , 38 , 39 , 40 ]. Choi et al [ 37 ] showed that amorphous or crystalline h-BN transforms to c-BN at a much lower rate in the absence of B 2 O 3 at 4.6 GPa and 1350 °C (AlN-catalyzed).…”

Section: Discussionmentioning

confidence: 99%

On the Stability of c-BN-Reinforcing Particles in Ceramic Matrix Materials

2018

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Cubic boron nitride (c-BN) composites produced at high pressures and temperatures are widely used as cutting tool materials. The advent of new, effective pressure-assisted densification methods, such as spark plasma sintering (SPS), has stimulated attempts to produce these composites at low pressures. Under low-pressure conditions, however, transformation of c-BN to the soft hexagonal BN (h-BN) phase can occur, with a strong deterioration in hardness and wear. In the present work, the influence of secondary phases (B2O3, Si3N4, and oxide glasses) on the transformation of c-BN was studied in the temperature range between 1100 °C and 1575 °C. The different heat treated c-BN particles and c-BN composites were analyzed by SEM, X-ray diffraction, and Raman spectroscopy. The transformation mechanism was found to be kinetically controlled solution–diffusion–precipitation. Given a sufficiently low liquid phase viscosity, the transformation could be observed at temperatures as low as 1200 °C for the c-BN–glass composites. In contrast, no transformation was found at temperatures up to 1575 °C when no liquid oxide phase is present in the composite. The results were compared with previous studies concerning the c-BN stability and the c-BN phase diagram.

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“…Amorphous form of BN with sp 2 hybridization can be easily produced by several experimental methods such as high frequency plasma‐assisted chemical vapor deposition, ball milling etc . Yet its properties are still needed to be explored.…”

Section: Introductionmentioning

confidence: 99%

“…Amorphous form of BN with sp 2 hybridization can be easily produced by several experimental methods such as high frequency plasma-assisted chemical vapor deposition, ball milling etc. [5][6][7][8][9][10][11][12][13][14][15][16][17][18] Yet its properties are still needed to be explored. Amorphous cubic BN layers were also fabricated by the reactive pulse plasma method.…”

Section: Introductionmentioning

confidence: 99%

Tetrahedral amorphous boron nitride: A hard material

Durandurdu

2019

J Am Ceram Soc

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We generate a tetrahedrally coordinated amorphous boron nitride (BN) model by means of first principles molecular dynamics calculations and report its mechanical and electrical properties in detail. The amorphous configuration is almost free from chemical disorder and consists of about 20% coordination defects, similar to tetrahedral (diamond‐like) amorphous carbon. Its theoretical band gap energy is about 2.0 eV, less than 4.85 eV estimated for cubic BN. The bulk modulus and Vickers hardness of tetrahedral amorphous BN are computed as 206 GPa and 28‐35 GPa, respectively. Based on these findings, we propose that tetrahedral noncrystalline BN can serve as electronic and hard materials as well.

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Synthesis of cubic boron nitride from amorphous boron nitride containing oxide impurity using Mg–Al alloy catalyst solvent

Cited by 14 publications

References 12 publications

Hexagonal nanosheets in amorphous BN: A first principles study

Hexagonal nanosheets in amorphous BN: A first principles study

On the Stability of c-BN-Reinforcing Particles in Ceramic Matrix Materials

Tetrahedral amorphous boron nitride: A hard material

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