Controlling the Morphology and Oxidation Resistance of Boron Carbide Synthesized Via Carbothermic Reduction Reaction

Thermodynamic investigation and reaction mechanism of B4C synthesis based on carbothermal reduction

“…The product has been verified to be pure B 4 C grain as indicated in Figure A′. The clean and smooth grain surface of the primary polyhedral B 4 C particle implies that it is nucleated in the liquid (B 2 O 3 liquid) and then gradually grows up according to the classical nucleation theory . Consistent with the thermodynamic investigation, the B 4 C polyhedral particle is synthesized by LS mechanism according to reaction (10): 2B 2 O 3 (l) + 7C(s) = B 4 C(s) + 6CO(g).…”

“…Meanwhile, the reducing CO partial pressure permits the reaction (10) to occur at a relatively low temperature. This explains why some researchers synthesized B 4 C at temperatures lower than 1700 K . In addition, with a high supersaturation of B 2 O 2 gas, reaction (11) is also feasible over the whole temperature range.…”

“…Elsheikh et al proposed that the reaction of C with liquid B 2 O 3 (LS mechanism) or gaseous B 2 O 3 (VS mechanism) might occur to form B 4 C. Weimer et al and Ma et al revealed B 4 C nanowires were formed by VV mechanism according to the reaction: 2B 2 O 3 (g) + 8CO(g) = B 4 C(s) + 7CO 2 (g) or 2B 2 O 2 (g) + 6CO(g) = B 4 C(s) + 5CO 2 (g). Ahmed et al referred that B 4 C formation could take place via two main mechanisms of LS mechanism and VS mechanism. Despite the above research progresses, the reaction mechanism of B 4 C synthesis as yet remains unclear due to the lack of sufficient theoretical investigation.…”

Influence of precursor preparation on the synthesis of boron carbide from glutinous rice flour

“…Glutinous rice flour is an interesting alternative precursor for the B4C synthesis because it is an inexpensive and readily available carbon source with high content of -OH functional groups in its structure. These -OH functional groups can interact with boric acid, resulting in the formation of B-O-C bonds which facilitates the reaction between B and C species to form B4C, enhancing low temperature synthesis [7,[15][16].…”

Microstructure, Thermo-Physical, Mechanical and Wear Properties of in-Situ Formed Boron Carbide - Zirconium Diboride Composite

“…Boron carbide (B 4 C) is a potential material for heavy duty wear applications, cutting tools, armor and neutron absorbers in various types of nuclear reactors (Pressurized water reactor, boiling water reactor, fast breeder reactor and high temperature reactors), due to its high melting point, hardness, wear resistance, moderate electrical and thermal conductivity, chemical stability, retention of strength at elevated temperatures and high neutron absorption cross-section for both thermal and fast neutrons [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Important properties of boron carbide are listed in Table 1 [3,16].…”