Thermal stability of the negative electron affinity condition on cubic boron nitride

1998 ◽  
Vol 72 (23) ◽  
pp. 3023-3025 ◽  
Author(s):  
Kian Ping Loh ◽  
Mikka Nishitani-Gamo ◽  
Isao Sakaguchi ◽  
Takashi Taniguchi ◽  
Toshihiro Ando
Keyword(s):  
Thermal Stability ◽  
Boron Nitride ◽  
Electron Affinity ◽  
Cubic Boron Nitride ◽  
Negative Electron Affinity ◽  
Thermal Stability Of

Negative electron affinity of cubic boron nitride

1999 ◽  
Vol 8 (2-5) ◽  
pp. 781-784 ◽  
Author(s):  
Kian Ping Loh ◽  
Isao Sakaguchi ◽  
Mikka Nishitani-Gamo ◽  
Takashi Taniguchi ◽  
Toshihiro Ando
Keyword(s):  
Boron Nitride ◽  
Electron Affinity ◽  
Cubic Boron Nitride ◽  
Negative Electron Affinity

Thermal Stability of Cubic Boron Nitride Films Deposited by Chemical Vapor Deposition.

ChemInform ◽  
2007 ◽  
Vol 38 (2) ◽  
Author(s):  
J. Yu ◽  
Z. Zheng ◽  
H. C. Ong ◽  
K. Y. Wong ◽  
S. Matsumoto ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Chemical Vapor Deposition ◽  
Boron Nitride ◽  
Vapor Deposition ◽  
Cubic Boron Nitride ◽  
Chemical Vapor ◽  
Boron Nitride Films ◽  
Thermal Stability Of

scholarly journals Thermal Stability of TiN Coated Cubic Boron Nitride Powder

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1642
Author(s):  
Benjamin Hering ◽  
Anne-Kathrin Wolfrum ◽  
Tim Gestrich ◽  
Mathias Herrmann
Keyword(s):  
Thermal Stability ◽  
Boron Nitride ◽  
Cubic Boron Nitride ◽  
Atomic Layer ◽  
Normal Pressure ◽  
Ceramic Composites ◽  
Recrystallization Process ◽  
Layer Deposition ◽  
Boron Nitride Powder ◽  
Thermal Stability Of

Wear-resistant, super hard ceramic composites based on cubic boron nitride (cBN) are of great interest to industry. However, cBN is metastable under sintering conditions at normal pressure and converts into the soft hexagonal BN (hBN). Therefore, efforts are being made to avoid this process. Besides short sintering times, the use of coated cBN-particles is a way to minimize this process. Therefore, the thermal stability of TiN coated cBN powders in high purity argon and nitrogen atmospheres up to temperatures of 1600 °C was investigated by thermogravimetry, X-ray phase analysis, scanning electron microscopy and Raman spectroscopy. The TiN coating was prepared by the atomic layer deposition (ALD)-method. The investigations showed that the TiN layer reacts in Ar at T ≥ 1200 °C with the cBN and forms a porous TiB2 layer. No reaction takes place in nitrogen up to temperatures of 1600 °C. Nevertheless, the 20 and 50 nm thin coatings also undergo a recrystallization process during heat treatment up to temperatures of 1600 °C.

Thermal Stability of Cubic Boron Nitride Films Deposited by Chemical Vapor Deposition

2006 ◽  
Vol 110 (42) ◽  
pp. 21073-21076 ◽  
Author(s):  
J. Yu ◽  
Z. Zheng ◽  
H. C. Ong ◽  
K. Y. Wong ◽  
S. Matsumoto ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Chemical Vapor Deposition ◽  
Boron Nitride ◽  
Vapor Deposition ◽  
Cubic Boron Nitride ◽  
Chemical Vapor ◽  
Boron Nitride Films ◽  
Thermal Stability Of

High Temperature Thermal Stability of Innovative Nanostructured Thin Coatings for Advanced Tooling

2014 ◽  
Vol 622-623 ◽  
pp. 45-52 ◽  
Author(s):  
Marcello Cabibbo ◽  
Mohamad El Mehtedi ◽  
Nicola Clemente ◽  
Stefano Spigarelli ◽  
A.M.S. Hamouda ◽  
...  
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Boron Nitride ◽  
Die Casting ◽  
Cubic Boron Nitride ◽  
Hard Coatings ◽  
Thin Coatings ◽  
Polycrystalline Cubic Boron Nitride ◽  
The Coefficient Of Friction ◽  
Thermal Stability Of

Tools for machining are made of hard steels and cemented carbide (WC-Co). For specialized applications, such as aluminium machining, diamond or polycrystalline cubic boron nitride are also used. The main problem with steel, isthat itexhibits a relatively low hardness (below 10 GPa) which strongly decreases upon annealing above about 600 K.Thus, the majority of modern tools are nowadays coated with hard coatings that increase the hardness, decrease the coefficient of friction and protect the tools against oxidation. A similar approach has been recently used to obtain a longer duration of the dies for aluminium die-casting.

Features of the crystalline structure and thermal stability of the wurtzite modification of boron nitride

1985 ◽  
Vol 24 (1) ◽  
pp. 77-82
Author(s):  
A. V. Kurdyumov ◽  
G. S. Oleinik ◽  
N. F. Ostrovskaya ◽  
A. N. Pilyankevich ◽  
G. I. Sawakin
Keyword(s):  
Thermal Stability ◽  
Boron Nitride ◽  
Crystalline Structure ◽  
Thermal Stability Of

scholarly journals Electrospun Silk-Boron Nitride Nanofibers with Tunable Structure and Properties

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1093
Author(s):  
Ye Xue ◽  
Xiao Hu
Keyword(s):  
Thermal Stability ◽  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Environmental Research ◽  
Strong Interactions ◽  
Helical Structures ◽  
Scanning Calorimetry ◽  
Modulated Differential Scanning Calorimetry ◽  
Good Thermal Stability ◽  
Thermal Stability Of

In this study, hexagonal boron nitride (h-BN) nanosheets and Bombyx mori silk fibroin (SF) proteins were combined and electrospun into BNSF nanofibers with different ratios. It was found that the surface morphology and crosslinking density of the nanofibers can be tuned through the mixing ratios. Fourier transform infrared spectroscopy study showed that pure SF electrospun fibers were dominated by random coils and they gradually became α-helical structures with increasing h-BN nanosheet content, which indicates that the structure of the nanofiber material is tunable. Thermal stability of electrospun BNSF nanofibers were largely improved by the good thermal stability of BN, and the strong interactions between BN and SF molecules were revealed by temperature modulated differential scanning calorimetry (TMDSC). With the addition of BN, the boundary water content also decreased, which may be due to the high hydrophobicity of BN. These results indicate that silk-based BN composite nanofibers can be potentially used in biomedical fields or green environmental research.

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