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Shock compressibility and spallation strength of cubic modification of polycrystalline boron nitride
High Temperature, 2009Methods 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 +7 more
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Mechanism study on the wear of polycrystalline cubic boron nitride cutting tools
SPIE Proceedings, 2010The 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, 1998Abstract 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 +3 more
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Processing and properties of polycrystalline cubic boron nitride reinforced by SiC whiskers
International Journal of Applied Ceramic Technology, 2018Abstract 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 +5 more
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Thermal Conductivity of Polycrystalline Cubic Boron Nitride Compacts
1979Slack [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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Effect of grain boundaries on iron distribution in polycrystalline cubic boron nitride
Journal of Physics: Condensed Matter, 2002The 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 +3 more
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Inorganic Materials: Applied Research, 2016
The effect of the thermochemical modification of hexagonal BN micropowders with aluminum on the synthesis of cubic-BN-based polycrystals after attritor processing is studied. It is found that the preliminary hBNattr modification with aluminum reduces the parameters of the hBN → cBN phase transformation, namely, p and T, and results in the formation of ...
V. T. Senyut +5 more
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The effect of the thermochemical modification of hexagonal BN micropowders with aluminum on the synthesis of cubic-BN-based polycrystals after attritor processing is studied. It is found that the preliminary hBNattr modification with aluminum reduces the parameters of the hBN → cBN phase transformation, namely, p and T, and results in the formation of ...
V. T. Senyut +5 more
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Tool-wear mechanisms in hard turning with polycrystalline cubic boron nitride tools
Wear, 2001Hard turning is a turning operation performed on high strength alloy steels (45 < HRC < 65) in order to reach surface roughness close to those obtained in grinding (R ∼ 0.1 μm). Extensive research being conducted on hard turning has so far addressed several fundamental questions concerning chip formation mechanisms, tool-wear, surface integrity and ...
G. Poulachon, A. Moisan, I.S. Jawahir
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A Review of Polycrystalline Cubic Boron Nitride Cutting tool Developments and Application
1993This paper reviews published literature on the manufacture and application of polycrystalline cubic boron nitride (PCBN) cutting tools. More specifically, it details the various commercial CBN products, their composition/microstructure and physical properties, together with workpiece/material applications and associated machinability data. In addition,
A. M. Abrão +2 more
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