Results 201 to 210 of about 13,468 (252)

Sintering of Fine Grained Polycrystalline Cubic Boron Nitride Compacts without Binder

Applied Mechanics and Materials, 2014
Cubic boron nitride (cBN) is a excellent super hard materials with superior mechanical properties that has been widely used in different industrial applications. Conventional cBN was sintered with binder in the cBN powder, and the binder affect the mechanical properties of cBN.
Guo Duan Liu, Zi Li Kou, Xiao Zhi Yan, Li Lei, Duan Wei He   +4 more
openaire   +1 more source

Study on the properties and fracture mode of pure polycrystalline cubic boron nitride with different particle sizes

, 2020
In this paper, pure polycrystalline cubic boron nitride (cBN) without additives was synthesized by a direct sintering method at 7.3 GPa and 2100 °C using industrial cBN powders with different particle sizes.
Hao Wang, F. Deng, Zhuowei Zhang, Hui Xie, Xuehua He, Hanbin Wang   +5 more
semanticscholar   +1 more source

Synthesis of polycrystalline cubic boron nitride from hexagonal boron nitride after mechanical activation and modification with aluminum

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, P. A. Vityaz, S. A. Kovalyova, E. I. Mosunov, I. V. Valkovich, T. V. Gamzeleva   +5 more
openaire   +1 more source

Surface morphology and microstructural analysis of al 8081-mg/zr/tio2 nano metal matrix composite – A base for performance evaluation of polycrystalline diamond and poly cubic boron nitride tools

Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2021
The investigation of surface roughness in machined materials/products has proven to be a difficult undertaking. The surface quality is determined not only by the parameters but also by the cutting conditions.
Balla S Prasad, Chandra M KarakaVVNR, Venkata S Annavarapu   +2 more
semanticscholar   +1 more source

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
openaire   +1 more source

Tool-wear mechanisms in hard turning with polycrystalline cubic boron nitride tools

Wear, 2001
Hard 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
openaire   +1 more source

Numerical simulation analysis and experimental validation on wear/fracture mechanisms of polycrystalline cubic boron nitride superabrasives in high-speed grinding

Ceramics International, 2019
In this study, a two-dimensional finite element model is proposed to investigate the wear/fracture mechanisms of polycrystalline cubic boron nitride (PCBN) superabrasives in high-speed grinding process.
Zhiwen Rao, W. Ding, Yejun Zhu, Jiu-hua Xu   +3 more
semanticscholar   +1 more source

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 ...
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source