scholarly journals In Situ Renewable Coating of Boron Carbide (B4C) for Plasma Materials for Plasma-Technological and Fusion Devices

2019 ◽  
Author(s):  
Leon Begrambekov ◽  
Andrey Grunin ◽  
Nikolay Puntakov ◽  
Yaroslav Sadovskiy ◽  
Vyacheslav Budaev ◽  
...  
Keyword(s):  
Boron Carbide ◽  
Boron Carbide B4c

scholarly journals In Situ EELS and TEM Observation of Boron Carbide (B4C) During Hydrogen- and Helium-Ion Bombardments

1995 ◽  
Vol 6 (1) ◽  
pp. 149-157 ◽  
Author(s):  
Kouhei N. Kushita ◽  
Kiichi Hojou ◽  
Shigemi Furuno
Keyword(s):  
Boron Carbide ◽  
Helium Ion ◽  
Boron Carbide B4c

scholarly journals In situ TEM observations of ion irradiation damage in boron carbide

2019 ◽  
Vol 39 (4) ◽  
pp. 726-734 ◽  
Author(s):  
Guillaume Victor ◽  
Yves Pipon ◽  
Nathalie Moncoffre ◽  
Nicolas Bérerd ◽  
Claude Esnouf ◽  
...  
Keyword(s):  
Boron Carbide ◽  
Ion Irradiation ◽  
Irradiation Damage ◽  
In Situ Tem

Pressureless Sintering of Boron Carbide-Based Superhard Materials

2010 ◽  
Vol 159 ◽  
pp. 145-148 ◽  
Author(s):  
Dimitar D. Radev
Keyword(s):  
Transition Metal ◽  
Boron Carbide ◽  
Sintering Temperature ◽  
Liquid Phase Sintering ◽  
Vacuum Furnace ◽  
Pressureless Sintering ◽  
Metal Carbides ◽  
Sintering Aids ◽  
Transition Metal Carbides

Boron carbide-based materials B4C-MexBy were densified by pressureless sintering in a vacuum furnace. Some transition metal carbides (TiC, ZrC, HfC, Cr3C2 and WC) from groups IV-VI were used as sintering aids. The optimal sintering temperature in the range 2220-2250oC was used for any composition. Here we show the possibilities to activate the mass transport of the B4C by the mechanism of liquid phase sintering. The method of reactive sintering of B4C in the presence of additives of some transition metal carbides allows in situ synthesis of dense B4C-MexBy materials. Structural properties and fracture toughness of the B4C-based composite materials were discussed. The properties of some of these materials and the possibilities for their application are also discussed.

Scanning Auger and Xps Studies of Fracture Surfaces of B4C Hot Pressed with Excess Carbon

1989 ◽  
Vol 153 ◽  
Author(s):  
Benjamin M. DeKoven ◽  
Eric A. Ness ◽  
David D. Hawn
Keyword(s):  
Fracture Surface ◽  
Boron Carbide ◽  
Carbon Content ◽  
Low Dose ◽  
Xps Spectra ◽  
Excess Carbon ◽  
Fracture Surfaces ◽  
Four Point Bending ◽  
Hardness Values

AbstractA series of boron carbide materials was hot pressed with 0-7% excess carbon. The strength of each material was determined by four point bending, and found to decrease from about 600MPa to 300MPa as the carbon content increased from 0% to 7%. Diamond indentation yielded hardness values that decreased from 28.3 to 25.OGPa and toughness values that increased from 3.5 to 4.5 MPa√mover the same carbon range. Each sample was fractured in situ in ultrahigh vacuum (UHV) and examined by scanning Auger microanalysis (SAM) and XPS to determine both the elemental and chemical state distributions. For the samples with excess carbon, localized carbonrich regions are observed on fracture surfaces by SAM. XPS reveals a 50% enhancement of excess carbon on the fracture surface compared to the bulk for the sample with 7% excess carbon. A correlation was observed between surface carbon composition and the bulk toughness and hardness. The C(ls) XPS spectra were utilized to determine the nature of carbon in B4C on freshly fractured and Ne+ bombarded surfaces. Two distinct peaks were observed in the C(ls) region. Low dose ion bombardment resulted in a single broad C(ls) peak at the midpoint of the two initial peaks. It can be inferred from this data that there are C-C-C intericosahedral linkages in B4C.

In-situ synthesis and densification of boron carbide and boron carbide-graphene nanoplatelet composite by reactive spark plasma sintering

2018 ◽  
Vol 44 (17) ◽  
pp. 21132-21137 ◽  
Author(s):  
Rajath Alexander ◽  
T.S.R. Ch. Murthy ◽  
K. Vasanthakumar ◽  
N.S. Karthiselva ◽  
Srinivasa Rao Bakshi ◽  
...  
Keyword(s):  
Boron Carbide ◽  
Spark Plasma Sintering ◽  
In Situ Synthesis ◽  
Graphene Nanoplatelet ◽  
Plasma Sintering ◽  
Spark Plasma

The Comparison between Boron Carbide (B4C) with other Common Inhibitors on Physical and Mechanical Properties of WC/Co

2012 ◽  
Vol 05 ◽  
pp. 102-110 ◽  
Author(s):  
H. Tamizifar ◽  
A.M. Hadian ◽  
M. Tamizifar
Keyword(s):  
Boron Carbide ◽  
Vanadium Carbide ◽  
Sintering Temperature ◽  
Physical And Mechanical Properties ◽  
Growth Inhibitor ◽  
Hard Metal ◽  
Growth Inhibitors ◽  
Fine Grained ◽  
Hard Metals ◽  
Boron Carbide B4c

The hardness, toughness and sum of cracks measurement of fine-grained WC - Co hard metals were studied. Thirty commercial and experimental hard metal grades with different additives such as boron carbide ( B 4 C ), vanadium carbide ( VC ), chromium carbide ( Cr 3 C 2) and silicon carbide ( SiC ) were prepared in a commercial sinter HIP furnace. Physical, mechanical and microstructure properties were investigated to build up a representative hardness/sum of cracks measurement band. This band was then used to estimate the most effective sintering temperature and the amount of each additives. Afterwards, influence of grain growth inhibitors in optimum condition were compared. The results showed that the grades, doped with B 4 C and VC as growth inhibitor exhibits more hardness than other comparable doped alloys. However, Cr 3 C 2 is favorable in toughness improvement.

Sign in / Sign up

Export Citation Format

Share Document