The paper presents the results of experimental studies on implementation electric arc synthesis boron carbide using carbon with different morphology and origin as a feedstock: fibers, flake graphite, obtained by pyrolysis plant waste, namely, pine sawdust cedar nuts husks. A feature method used is its an original plasma reactor atmospheric air working gas medium. Oxidation feedstock products in...

Solid-state neutron detectors based only on boron-rich semiconductors are of interest for their potential to provide the highest thermal neutron detection efficiencies of any solid-state neutron detectors. A simple physical model, recently shown to generate thermal neutron capture product spectra that agree quantitatively with full-physics GEANT4 simulation, is used to compare the capture produ...

Abstract Recently, silicon carbide–boron carbide composite ceramics have attracted more and attention. The most important achievements of the should be applied in terms mechanical, physical, chemical for use various advanced industries, such as armor plates, nozzles, abrasive tools, mechanical seals, etc. To prepare with good performance, synthesis powders is basis. approaches are systematicall...

In this paper, a hand-held neutron radiation sensor application is described. The sensor system utilizes a new class of boron-carbide diode that interacts with incoming neutrons. To interface with the boron-carbide diode an integrated front-end is designed in a 1.5/spl mu/m standard CMOS technology. With the diode and front-end microchip, a hand-held neutron detection system was realized with a...

Knowledge of the thermal conductivity of boron carbide is necessary o evaluate its potential for high temperature thermoelectric energy conversion applications. We have measured the thermal diffusivity of hot -pressed boron carbide B1_xCx samples as a function of composition (0.1 < x < 0.2), temperature (300 K to 1700 K) and temperature cycling. These data in concert with density and specific h...

A new ceramic sintering approach employing plastic deformation as the dominant mechanism is proposed, at low temperature close to the onset point of grain growth and under high pressure. Based on this route, fully dense boron carbide without grain growth can be prepared at 1,675-1,700 °C and under pressure of (≥) 80 MPa in 5 minutes. The dense boron carbide shows excellent mechanical properties...

We have investigated the changes in the electronic structure of molecu larly adsorbed orthocarborane fi lms, as a function of Hg co-adsorption, using photoe mission. The interaction between Hg and molecular orthocarborane is weak and results in the formation of some small aggregates of Hg. This behavior is very different from alkali metals interaction with molecular carborane fi lms and the int...

Sintering with low frequency rf power (-50 M H z ) is a new technique with unique capabilities that has been used to sinter a variety of ceramic materials, including zirconia-toughened alumina, alumina, silicon carbide, and boron carbide. Processing with low frequencies offers many advantages compared to processing with conventional microwave frequencies (915 MHz and 2.45 GHz). Because of the l...

Ab initio density-functional theory study suggests that pillared Li-dispersed boron carbide nanotubes is capable of storing hydrogen with a mass density higher than 6.0 weight% and a volumetric density higher than 45 g/L. The boron substitution in carbon nanotube greatly enhances the binding energy of Li atom to the nanotube, and this binding energy (~ 2.7 eV) is greater than the cohesive energ...