This paper describes the synthesis of B4C/carbon nanotube (CNT) composite by hot-pressing and shows details for effectiveness CNT addition, additive amount its orientation on thermal shock resistance. CNTs tend to array perpendicular direction, which caused anisotropic mechanical properties B4C/CNT composite. We investigated residual bending strength thermally shocked composites determined crit...

This thesis is a theoretical study of configurationally disordered icosahedral boronrich solids, in particular boron carbides, using density functional theory and alloy theory. The goal is to resolve discrepancies, regarding the properties of boron carbides, between experiments and previous theoretical calculations which have been a controversial issue in the field of icosahedral boron-rich sol...

Aluminum (Al) matrix composites with boron carbide (B4C) reinforcements were fabricated by solid state powder metallurgy using the hot-pressing process. Composite materials at different volume fractions of B4C particles, ranging from 2% to 12%, evaluate impact on thermal and mechanical properties composite materials. Thermal properties, such as conductivity (TC) coefficient expansion (CTE), mea...

The assessed binary phase diagram of boron-carbon exhibits a single intrinsically disordered alloy phase designated “B4C” with rhombohedral symmetry occupying a broad composition range that falls just short of the nominal carbon content of 20%. As this composition range is nearly temperature independent, the phase diagram suggests a violation of the third law of thermodynamics, which typically ...

The aim of this work is to apply the Gamma Ray Transmission (GRT), a non destructive technique, for structural characterization of ceramic samples. With this technique, the porosity of Alumina (Al2O3) and Boron Carbide (B4C) ceramic samples, in tablet format, was determined. The equipment employed is constituted by a 241 Am gamma ray source (59.6 keV and 100mCi), a 2”x2” diameter NaI (Tl) scint...

The densification behavior and mechanical properties of B4C hot-pressed at 2000°C for 1 h with additions of Al2O3 up to 10 vol% were investigated. Sinterability was greatly improved by the addition of a small amount of Al2O3. The improvement was attributed to the enhanced mobility of elements through the Al2O3 near the melting temperature or a reaction product formed at the grain boundaries. As...

A single point cutting tool is modeled out of two different materials having desired thermoelectric properties. The material used B4C doped with compositions Titanium Carbide. In the present work, three on both sides made by tungsten carbide. range composition boron carbide (B4C) was selected randomly 0-12.5%, 0-25.4% and 12.5 – 25.4% first half second respectively. simulation process done in A...

Boron carbide is one of the hardest materials. The combustion method was used to synthesize B4C-TiB2 nanocomposite powder in a B2O3-Mg-TiO2-C system. An experimental study of the formation of B4C–TiB2 nanoparticles was conducted in the thermal explosion mode. A mixture of B2O3:TiO2:Mg:C at a molecular ratio of 3:1:12:1 was chosen to obtain the B4C–TiB2. This powder mixture was milled for differ...

In order to improve the mechanical properties of B4C ceramics, B4C@TiB2 composite powders with core-shell structure are prepared by molten salt method using and Ti as raw materials. And ceramics were from spark plasma sintering (SPS). The results show that exhibit intact structure. improves mass transfer during sintering. When molar ratio B4C/Ti is 2/1, relative density, Vickers hardness, fract...

In this study, to fabricate neutron shielding material, boron carbide (B4C)-reinforced aluminum (Al) alloy composites were successfully fabricated by stir casting followed a hot rolling process. Microstructural analysis of B4C/Al6061 with different volume fractions (5, 10, 20, 25, and 30%) revealed that the had ratios similar target B4C. Furthermore, B4C reinforcements uniformly dispersed in Al...