Journal ArticleDOI
Sintered superhard materials.
TLDR
The sintered masses are produced on a commercial scale and are increasingly used as cutting tools on hard or abrasive materials, as wire-drawing dies, in rock drills, and in special high-pressure apparatus.Abstract:
Diamond or cubic boron nitride particles can be sintered into strong masses at high temperatures and very high pressures at which these crystalline forms are stable. Most of the desirable physical properties of the sintered masses, such as hardness and thermal conductivity, approach those of large single crystals; their resistance to wear and catastrophic splitting is superior. The sintered masses are produced on a commercial scale and are increasingly used as cutting tools on hard or abrasive materials, as wire-drawing dies, in rock drills, and in special high-pressure apparatus.read more
Citations
More filters
Journal ArticleDOI
Covalent Organic Frameworks: Chemistry beyond the Structure.
TL;DR: A closer look is taken at the growth of COFs from mere supramolecular structures to potential industrializable materials.
Journal ArticleDOI
Ultrahard nanotwinned cubic boron nitride.
Yongjun Tian,Bo Xu,Dongli Yu,Yanming Ma,Yanbin Wang,Yingbing Jiang,Wentao Hu,Chengchun Tang,Yufei Gao,Kun Luo,Zhisheng Zhao,Li-Min Wang,Bin Wen,Julong He,Zhongyuan Liu +14 more
TL;DR: It is shown that hardening of cBN is continuous with decreasing twin thickness down to the smallest sizes investigated, contrasting with the expected reverse Hall–Petch effect below a critical grain size or the twin thickness of ∼10–15 nm found in metals and alloys.
Journal ArticleDOI
Synthesis of high-purity boron nitride single crystals under high pressure by using Ba-BN solvent
Takashi Taniguchi,Kenji Watanabe +1 more
TL;DR: In this paper, high-purity cubic boron nitride (cBN) and hexagonal Boron Nitride (hBN) single crystals were synthesized at 4.5 GPa and 1500 C using barium BORON nitride as a solvent, and their band edge optical properties were measured by cathodoluminescence spectroscopy.
Journal ArticleDOI
Boron suboxide: As hard as cubic boron nitride
TL;DR: In this paper, the Vickers hardness of boron suboxide single crystals was measured using a diamond indentation method using a loading force of 0.98 N. The average fracture toughness was measured as 4.5m1/2.
Journal ArticleDOI
Superhard B–C–N materials synthesized in nanostructured bulks
Yusheng Zhao,Duanwei He,Luke L. Daemen,Tongde Shen,Ricardo B. Schwarz,Yuntian Zhu,David L. Bish,Jian Yu Huang,Jian Yu Huang,Jianzhong Zhang,Guoyin Shen,Jiang Qian,Jiang Qian,T. W. Zerda +13 more
TL;DR: In this paper, high-pressure synthesis of well-sintered millimeter-sized bulks of superhard BC2N and BC4N materials in the form of a nanocrystalline composite with diamond-like amorphous carbon grain boundaries was reported.
References
More filters
Journal ArticleDOI
Direct Transformation of Hexagonal Boron Nitride to Denser Forms
F. P. Bundy,R. H. Wentorf +1 more
TL;DR: In this paper, a hexagonal, graphitelike boron nitride was changed directly into the zincblende cubic form reported earlier or into a new wurtzite form by the application of static high pressures.
Journal ArticleDOI
Direct Conversion of Graphite to Diamond in Static Pressure Apparatus
TL;DR: At pressures above about 125 kbar and temperatures in the 3000°K range it is found that graphite spontaneously collapses completely to polycrystalline diamond which may be retrieved quantitatively.
Journal ArticleDOI
Synthesis of the Cubic Form of Boron Nitride
TL;DR: In this paper, a study of the formation of cubic boron nitride showed that the alkali and alkaline earth metals and their nitrides are effective catalysts for converting hexagonal BN into cubic, and a minimum of about 45 000 atm and 1500°C has been found to be optimum up to the present time.
Journal ArticleDOI
High Pressure Electrical Resistance Cell, and Calibration Points above 100 Kilobars
A. S. Balchan,H.G. Drickamer +1 more
TL;DR: In this article, a high pressure electrical cell is described consisting of tapered Carboloy pistons supported by a pyrophyllite pellet, and a calibration is obtained based on the barium transition at 59 kb, the bismuth transition at 90 kb and an extrapolation of Bridgman's data.
Journal ArticleDOI
High-pressure physics: sustained static generation of 1.36 to 1.72 megabars.
TL;DR: The pressure in experiments with the diamond-window pressure cell exceeded 1.7 megabars, which is the highest sustained pressure ever generated under static conditions where the pressure in the sample itself was measured.