synthesis route for boron carbide ..

All the techniques on synthesis and consolidation of boron carbide are discussed in detail and critically reviewed. Discover the world's research 14+ million members

Synthesis and Consolidation of Boron Carbide- A Review will be available on

Boric acid solution was dropwise added to poly vinyl alcohol (PVA) solution under a hot condition (80 °C) and stirring. The condensation reaction was controlled by extracting of a white poly vinyl borate (PVBO) gel precursor which formed on the surface of the reaction mixture. By collecting of the gel several times during the reaction, the solution viscosity and concentration of the reacting mixtures was decreased, and the interface between the reactants was increased, resulting in a high dispersion of C-B at the nanometer scale. After drying of the PVBO precursor, the C/B2O3 molar ratio was controlled at (3.1–2.9), which is less than the stoichiometric ratio of 3.5, by the pyrolysis of the precursor at 650 °C for 2 h in air. The X-ray diffraction (XRD) analysis of the final product show that high purity semi-equiaxed grains and fiber-like shape nanocrystalline boron carbide powder was synthesized by the heat treatment of the pyrolyzed precursor at 1400 °C for 4 h in Ar flow. Compared to previous reports, it is the first time to report the formation of a fiber-like shape boron carbide by carbothermal reduction route at a low temperature as 1400 °C.


synthesize boron carbide are studied ..

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Self-propagating High-temperature Synthesis (SHS) of titanium and boron carbide (B4C) combined with explosively driven Dynamic Compaction (DC) was employed for the fabrication of composite TiB2/TiC compacts. A 23 factorially designed experiment set was used to examine the effects of the TiB2/TiC ratio, delay time and C/M ratio on the consolidation and properties of the compacts. The delay time is the time between completion of the SHS reaction and compaction. The C/M ratio, the ratio of the explosive mass to that of the flyer plate, influences the pressure applied to the samples during compaction. Composites with molar TiB2/TiC ratios of 2:1 or 1:2 were prepared using Ti and B4C or Ti, C and B4C, respectively, as reactants. The SHS/DC of Ti and B4C resulted in high quality, near fully dense TiB2/TiC composite compacts. Under best conditions, the densities were greater than 98% of the theoretical maximum. While the microhardness and densities of the compacts with TiB2/TiC ratio of 2:1 were comparable to those of monolithic TiB2 and TiC, compacts with TiB2/TiC ratios of 1:2 were poorly consolidated and contained extensive cracks. Given the high energy and time efficiency, high product quality and inexpensive reactants, the SHS/DC of Ti and B4C represents an attractive technique for the economical fabrication of TiB2/TiC composites.


The synthesis and consolidation of hard materials by …

N2 - Self-propagating High-temperature Synthesis (SHS) of titanium and boron carbide (B4C) combined with explosively driven Dynamic Compaction (DC) was employed for the fabrication of composite TiB2/TiC compacts. A 23 factorially designed experiment set was used to examine the effects of the TiB2/TiC ratio, delay time and C/M ratio on the consolidation and properties of the compacts. The delay time is the time between completion of the SHS reaction and compaction. The C/M ratio, the ratio of the explosive mass to that of the flyer plate, influences the pressure applied to the samples during compaction. Composites with molar TiB2/TiC ratios of 2:1 or 1:2 were prepared using Ti and B4C or Ti, C and B4C, respectively, as reactants. The SHS/DC of Ti and B4C resulted in high quality, near fully dense TiB2/TiC composite compacts. Under best conditions, the densities were greater than 98% of the theoretical maximum. While the microhardness and densities of the compacts with TiB2/TiC ratio of 2:1 were comparable to those of monolithic TiB2 and TiC, compacts with TiB2/TiC ratios of 1:2 were poorly consolidated and contained extensive cracks. Given the high energy and time efficiency, high product quality and inexpensive reactants, the SHS/DC of Ti and B4C represents an attractive technique for the economical fabrication of TiB2/TiC composites.

of titanium oxide with boron carbide and ..

material, magnetic materials, carbide, boron compound, nitrides, oxides and metal compounds of sintering. C ST-2300VSF series vacuum sintering furnace adopts horizontal water cooling…

Influence of Synthesis Temperature on the Defect …

A carbide boronizing method was first developed to produce dense boron carbide‐ zirconium diboride (“B4C”–ZrB2) composites from zirconium carbide (ZrC) and amorphous boron powders (B) by…