scholarly journals THE SYNTHESIS OF CUBIC BORON NITRIDE UNDER HIGH PRESSURES AND TEMPERATURES

1976 ◽  
Vol 25 (1) ◽  
pp. 1
Author(s):  
SZECHUAN CUBIC BORON NITRIDE CO-OP. GROUP
Keyword(s):  
Boron Nitride ◽  
High Pressures ◽  
Cubic Boron Nitride ◽  
High Pressures And Temperatures

Sintering of wurtzitic boron nitride under high pressures and temperatures

1994 ◽  
Vol 13 (1) ◽  
pp. 73-75 ◽  
Author(s):  
M. M. Bindal ◽  
B. P. Singh ◽  
S. K. Singhal ◽  
R. K. Nayar ◽  
R. Chopra
Keyword(s):  
Boron Nitride ◽  
High Pressures ◽  
High Pressures And Temperatures ◽  
Wurtzitic Boron Nitride

Hard Metal Matrix Composites Reinforced with Cubic Boron Nitride

2012 ◽  
Vol 727-728 ◽  
pp. 310-313 ◽  
Author(s):  
Guerold Sergueevitch Bobrovinitchii ◽  
Ana Lúcia Diegues Skury ◽  
Sérgio Neves Monteiro ◽  
Marcia G. de Azevedo
Keyword(s):  
Boron Nitride ◽  
High Speed ◽  
High Pressures ◽  
Cubic Boron Nitride ◽  
Hard Metal ◽  
Matrix Composites ◽  
Powder Mixtures ◽  
Negative Effect ◽  
Machining Operations ◽  
Composite Properties

Cubic boron nitride (cBN) composites with hardmetal such as metal turning and rocks drilling, WC-Co, matrix are alternative substitutes for similar diamond composites in high speed machining operations and rocks and drilling. Although it possesses related technical properties close to diamond, cBN has the inconvenience of reacting with hardmetals. This deteriorates the composite properties. A possible solution to this negative effect is to apply high pressures during the sintering operation. In this work, powder mixtures of cBN with a hardmetal (WC15%Co) were subjected to pressures up to 7.0GPa and temperatures up to 1400°C for 40 seconds. The results showed significantly higher values of hardness and compressive strength as well as an improved wear resistance.

Turbostratic boron nitride (BNt) under high pressures and temperatures

1986 ◽  
Vol 117 (1-2) ◽  
pp. 241-245 ◽  
Author(s):  
I.S. Gladkaya ◽  
G.N. Kremkova ◽  
V.N. Slesarev
Keyword(s):  
Boron Nitride ◽  
High Pressures ◽  
High Pressures And Temperatures

Compression and thermal expansion of rhombohedral boron nitride at high pressures and temperatures

2000 ◽  
Vol 61 (12) ◽  
pp. 1935-1938 ◽  
Author(s):  
Y Le Godec ◽  
D Martinez-Garcia ◽  
V.L Solozhenko ◽  
M Mezouar ◽  
G Syfosse ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Boron Nitride ◽  
High Pressures ◽  
High Pressures And Temperatures ◽  
Rhombohedral Boron

Corrugations of the basal planes in hexagonal boron nitride and their impact on the phase transition to cubic boron nitride

2015 ◽  
Vol 30 (S1) ◽  
pp. S90-S96 ◽  
Author(s):  
C. Schimpf ◽  
M. Schwarz ◽  
C. Lathe ◽  
E. Kroke ◽  
D. Rafaja
Keyword(s):  
Phase Transition ◽  
Boron Nitride ◽  
Basal Plane ◽  
High Pressures ◽  
Hexagonal Boron Nitride ◽  
Cubic Boron Nitride ◽  
Synthesis Product ◽  
Transmission Electron ◽  
Specific Shape ◽  
The Difference

Among the microstructure defects in hexagonal graphitic boron nitride, the basal plane corrugations are of high relevance for the sp2 to sp3 phase transition under high pressures (HP) and high temperatures (HT). A microstructure model is described, which is capable of quantifying the amplitude of the basal plane corrugations on the basis of the anisotropic X-ray diffraction line broadening. It is illustrated that this model correctly reproduces the specific shape of the diffraction lines from corrugated basal planes, i.e., the characteristic splitting of the 00l peaks. The results from XRD are verified by direct observation in the transmission electron microscope with high resolution. Subsequent HP/HT experiments were performed in order to highlight the difference in the phase transition kinetics between hexagonal boron nitride samples with different amount of basal plane corrugations. The effect of these microstructure defects on the conversion rate and on the obtained synthesis product is discussed.

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