Nanocrys Talline Boron Carbide Powder Synthesized Via Carbothermal Reduction Reaction

2015 ◽  
pp. 63-74
Author(s):  
Said M. El-Sheikh ◽  
Yasser M. Z. Ahmed ◽  
Emad M. M. Ewais ◽  
Asmaa Abd-El-Baset Abd Allah ◽  
Said Anwar
Keyword(s):  
Boron Carbide ◽  
Carbothermal Reduction ◽  
Reduction Reaction ◽  
Carbide Powder ◽  
Carbothermal Reduction Reaction

scholarly journals Mechanism for the formation of SiC by carbothermal reduction reaction using a microwave heating technique

2011 ◽  
Vol 119 (1394) ◽  
pp. 740-744 ◽  
Author(s):  
Shinobu HASHIMOTO ◽  
Syuho OHASHI ◽  
Kiyoshi HIRAO ◽  
You ZHOU ◽  
Hideki HYUGA ◽  
...  
Keyword(s):  
Microwave Heating ◽  
Carbothermal Reduction ◽  
Reduction Reaction ◽  
Carbothermal Reduction Reaction

Tailored MoSi2/SiC composites by mechanical alloying

1993 ◽  
Vol 8 (6) ◽  
pp. 1428-1441 ◽  
Author(s):  
S. Jayashankar ◽  
M.J. Kaufman
Keyword(s):  
Mechanical Alloying ◽  
Carbothermal Reduction ◽  
Reduction Reaction ◽  
Partial Pressures ◽  
Micron Size ◽  
Important Processing ◽  
Sic Composites ◽  
Carbon Additions ◽  
Carbothermal Reduction Reaction

MoSi2-based composites have been synthesized through the mechanical alloying (MA) of elemental molybdenum and silicon powders with and without carbon additions. The interplay between the phase formation sequence in the powders and the microstructural evolution in the consolidated samples is described. It is shown that the glassy SiO2 phase characteristic of conventional powder processed MoSi2 can be effectively eliminated by combining mechanical alloying, carbon additions, and an in situ carbothermal reduction reaction. Using this approach, composites consisting of uniformly distributed micron-size SiC in an MoSi2 matrix can be formed. The effect of important processing variables such as the extent of carbon additions, extraneous iron pickup during MA, partial pressures of oxygen, consolidation temperatures, and consolidation atmospheres is discussed based on the evidence obtained from DTA, TGA, TEM, and XRD.

Effect of Molecular Structure of Polyols with Different Molecular Characteristics on Synthesis of Boron Carbide Powder

2013 ◽  
Vol 534 ◽  
pp. 61-65 ◽  
Author(s):  
Masaki Kakiage ◽  
Naoki Tahara ◽  
Yusuke Tominaga ◽  
Satomi Yanagidani ◽  
Ikuo Yanase ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Thermal Decomposition ◽  
Boron Carbide ◽  
Carbothermal Reduction ◽  
Poly Vinyl Alcohol ◽  
Molecular Characteristics ◽  
Carbide Powder ◽  
Excess Carbon ◽  
Condensed Product ◽  
Crystalline Boron

Crystalline boron carbide (B4C) powder was synthesized by the carbothermal reduction of condensed products formed from boric acid (H3BO3) and polyols with different molecular characteristics, i.e., glycerin, mannitol, and poly (vinyl alcohol) (PVA). The effect of the molecular structure of the polyol on the thermal decomposition conditions and the obtained morphology of the B4C powder was discussed in this study. The thermal decomposition in air of each condensed product was performed before the carbothermal reduction in order to eliminate the excess carbon, where the decomposition conditions varied with the type of polyol. Crystalline B4C powder with less residual free carbon was synthesized from the thermally decomposed products by heating at 1250 °C for 5 h in an Ar flow. The thermal decomposition conditions and the particle size of the obtained B4C powder reflected the molecular characteristics of the polyols.

Processing factors influencing the free carbon contents in boron carbide powder by rapid carbothermal reduction

2016 ◽  
Vol 61 ◽  
pp. 14-20 ◽  
Author(s):  
Yong Gao ◽  
Anthony Etzold ◽  
Tyler Munhollon ◽  
William Rafaniello ◽  
Richard Haber
Keyword(s):  
Boron Carbide ◽  
Carbothermal Reduction ◽  
Free Carbon ◽  
Carbide Powder ◽  
Factors Influencing ◽  
Processing Factors
Sign in / Sign up

Export Citation Format

Share Document