Results 181 to 190 of about 7,614 (217)

Influence of sintering conditions on the properties of polycrystalline cubic boron nitride

Soviet Powder Metallurgy and Metal Ceramics, 1986
For the purpose of a further study of the sintering process of beta-BN grains into polycrystalline compacts, a study was made of the influence of sintering temperature and grain size on the microstructure, width of the x-ray diffraction lines, and certain physical properties of polycrystalline specimens of beta-BN. Sintering of beta-BN grains occurs in
V. B. Shipilo, N. G. Anichenko, L. A. Makovetskaya, G. P. Popel'nyuk   +3 more
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The influence of microstructure on the fracture properties of polycrystalline cubic boron nitride

Computational Materials Science, 2015
Abstract The effect of microstructure on the fracture properties of polycrystalline cubic boron nitride (PcBN) for industrial applications has been investigated numerically using the finite volume method. Representative synthetic microstructures have been created using a modified Voronoi tessellation procedure and these have been implemented in a ...
P. Alveen, D. McNamara, D. Carolan, N. Murphy, A. Ivanković   +4 more
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Picosecond laser processing of polycrystalline cubic boron nitride — A method to examine the ablation behavior of a high cubic boron nitride content grade material

Journal of Laser Applications, 2015
Chipping of hardened steel is often performed by the use of polycrystalline cubic boron nitride (PCBN). Moreover, PCBN tools are also suitable for many machining tasks with a lower degree of specialization, due to their excellent mechanical properties.
Daniel, Christian, Ostendorf, Sven, Hallmann, Sina, Emmelmann, Claus   +3 more
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Structurization of single-phase polycrystalline materials based on cubic boron nitride

Soviet Powder Metallurgy and Metal Ceramics, 1987
The authors study the crystallization of cubic boron nitrides by means of transmission electron microscopy and electron diffraction and the effects on crystal structure and microstructure of sintering, compacting, and heat treatment. Their results establish that the structurization of the nitrides is determined by structural phase transformations ...
V. F. Britun, G. S. Oleinik, A. N. Pilyankevich, S. S. Dzhamarov   +3 more
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Shock compressibility and spallation strength of cubic modification of polycrystalline boron nitride

High Temperature, 2009
Methods of shock-wave physics are used to perform experimental investigations of the elastoplastic and strength properties of cubic modification of polycrystalline boron nitride. The samples are prepared by pressing to a pressure of 7–8 GPa at a temperature of 1700–1800 °C and rank just a little below diamond in hardness. The measurements are performed
A. V. Utkin, V. V. Yakushev, A. V. Anan’in, V. F. Tatsii, A. N. Zhukov, A. N. Dremin, A. V. Bochko, N. N. Kuzin   +7 more
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Mechanism study on the wear of polycrystalline cubic boron nitride cutting tools

SPIE Proceedings, 2010
The samples of bearing steel, alloy cold-die steel, cold-harden cast iron were continuous machined by polycrystalline cubic boron nitride(PcBN) cutting tools dry turning. After the machining, the phases of cutting tools blade-edge were analyzed by X-ray diffraction analyzer and cutting tools blade-edge microstructure were observed by scanning ...
Yunhai Jia, Jiangang Li
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Some properties and cutting performance of polycrystalline cubic boron nitride with no additives

International Journal of Refractory Metals and Hard Materials, 1998
Abstract Hexagonal BN disks made by chemical vapor deposition were treated under ultra high pressure of 6.8 GPa and at temperatures from 1800 to 2500 °C for 1.8 ks. When treated at temperatures above 2100 °C, only a c-BN phase was detected. The sample treated at 2100 °C had a homogeneous microstructure having fine grain size less than 1 μm, whereas ...
T. Ohashi, K. Yamamoto, Y. Hamada, T. Tanase   +3 more
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Thermal Conductivity of Polycrystalline Cubic Boron Nitride Compacts

1979
Slack [1] predicts a room temperature thermal conductivity of about 13 W/cm°C for single-crystal cubic boron nitride with only diamond having a higher conductivity among the high thermal conductivity adamantine Compounds. However, no crystals of cubic BN were available that were large enough to measure the thermal conductivity, and the highest value ...
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Processing and properties of polycrystalline cubic boron nitride reinforced by SiC whiskers

International Journal of Applied Ceramic Technology, 2018
Abstract Dense polycrystalline cBN (Pc BN )–SiCw composites were fabricated by a two‐step method: First, SiO 2 was coated on the surface of cubic boron nitride ( cBN ) particles by the sol‐gel ...
Jian Li, Gang Shao, Yao Ma, Xiaotong Zhao, Hailong Wang, Rui Zhang   +5 more
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Effect of grain boundaries on iron distribution in polycrystalline cubic boron nitride

Journal of Physics: Condensed Matter, 2002
The influence of grain boundaries on local electronic states and the distribution of 57Fe ions in cubic boron nitride (c-BN) polycrystals has been investigated as a function of technological processing. The study was performed on two sets of c-BN samples: (1) prepared by catalytic synthesis and (2) synthesized by direct phase transformation.
J A Fedotova, A K Fedotov, N A Shishonok, J Stanek   +3 more
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