The Effects of Carbon Content on the Anisotropic Deformation Mechanism of Boron Carbide

Li, Jun; Liu, Lisheng; Xu, Shuang; Zhang, Jinyong; Wu, Yihang

doi:10.3390/ma11101861

Cited by 7 publications

(6 citation statements)

References 43 publications

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“…From all the above-mentioned results, it becomes obvious that relatively high temperatures and pressures with moderate dwell time are favorable for the sintering of SHS synthesized fine B 4 C powder. The dwell time impact can be conditioned by the fact that carbon can be dissolved in B 4 C and form carbon-rich carbides [ 13 , 53 , 54 ]. Thus, the sample with maximum relative density was obtained (99.2%) at 1950 °C temperature, and the dwell time was 10 min at a pressure of 50 MPa.…”

Section: Resultsmentioning

confidence: 99%

“…Although boron carbide was discovered in the nineteenth century as a by-product of a reaction involving metal borides, methods for its preparation are still being improved. Self-propagating high-temperature synthesis (SHS) [ 8 , 9 , 10 ] has proven to be a versatile processing route to fabricate refractory ceramics, including but not limited to the B 4 C of diverse morphologies, which exhibit a unique combination of enhanced physicomechanical and tribological properties [ 11 , 12 , 13 , 14 , 15 ]. The short synthesis duration (minutes), the consumption of only the inner heat of reagents, the simplicity of the technological equipment, and the ability to produce high-purity products emphasize the viability of this technology.…”

Section: Introductionmentioning

confidence: 99%

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Novel Pathway for the Combustion Synthesis and Consolidation of Boron Carbide

et al. 2022

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A novel pathway for the magnesiothermic reduction of boron oxide and magnesium dodecaboride (MgB12) in the presence of carbon by a self-propagating high-temperature synthesis method was proposed that was aimed at the direct preparation of boron carbide nanopowder. The combined utilization of two boron sources, boron oxide and MgB12, allowed tailoring the overall caloric effect of the process, increasing the yield of the target product and lessening the laborious leaching process. In addition, it is an alternative way to utilize magnesium borides, which are inevitable side products at boron production. Multivariate thermodynamic calculations performed in the B2O3-MgB12-Mg-C system allowed estimating equilibrium compositions of the products and deducing the optimum composition of the initial mixture for obtaining B4C. For the latter, the adiabatic temperature (Tad) is 2100 °C, which is theoretically enough for the implementation of the self-propagating reaction. The combustion reaction was shown to be extremely sensitive to the initial mixture composition, external pressure, as well as sample diameter (heat losses). It proceeds in self-oscillatory mode and leads to the product of a layered macrostructure. The combustion product was then consolidated by the spark plasma sintering technique at different conditions. Vickers microhardness was measured, and the wear erosion behavior was examined. The variation in lattice parameters of boron carbide reflected the influence of synthesis, sintering and erosion conditions on the ordering/disordering of the boron carbide structure.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel Pathway for the Combustion Synthesis and Consolidation of Boron Carbide

et al. 2022

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“…It is supposed that, for a brittle compound, B / G is smaller than 1.75, and for a metallic compound, B / G is greater than 1.75. Meanwhile, the general trend is that, with higher ductility, the value of B / G of structures increases. ,,− Since B / G is only an empirical rule to estimate ductility, we first validate the B / G criterion by applying uniaxial compressive strains along the c axis and a axis, respectively, on B 6.5 C, B 4 C, and B 2.5 C structures . The stress–strain curves of these three systems under uniaxial compression along the c axis and a axis are shown in Figure a,b, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…26,36,55−58 Since B/G is only an empirical rule to estimate ductility, 53 we first validate the B/G criterion by applying uniaxial compressive strains along the c axis and a axis, respectively, on B 6.5 C, B 4 C, and B 2.5 C structures. 59 The stress−strain curves of these three systems under uniaxial compression along the c axis and a axis are shown in Figure 2a,b, respectively. For clarity, Table 3 illustrates the B/G and failure strains of B 6.5 C, B 4 C, and B 2.5 C structures for comparison.…”

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confidence: 99%

First-Principles Predicting Improved Ductility of Boron Carbide through Element Doping

Zhang

et al. 2021

J. Phys. Chem. C

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Boron carbide (B4C) is a superhard material, whose wide engineering applications are limited by its brittleness under impact. Doping various impurity elements into B4C may lead to a significant change in its mechanical properties and deformation behaviors. To study this effect, density functional theory was employed to examine how different doping elements and doping content affect the mechanical properties and failure mechanism of B4C. The results show that doping Mg, N, or Si into B4C could improve its ductility, but the newly doped B11CP-CMgC and B11CP-NBC structures are not stable because of the bending of 3-atom chains after structural optimization. Si was selected to illustrate the effect of doping content on the mechanical properties and deformation mechanism of B4C. The results show that, with the increase of doping content, the ductility of xSi-B4C is increased, whereas its thermodynamic stability and mechanical stability are both decreased. The a-axis uniaxial compression of 6Si-B4C indicates that its failure strain is increased by 39.1% relative to that of B4C. Doping Si into B4C can enhance its ductility, which arises from the modified failure mechanism through stabilizing the icosahedra. Our study suggests that doping an element into B4C is a promising way to tune the mechanical properties and deformation mechanism of B4C.

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“…Boron carbide is characterized by a high melting point [1], extreme hardness, relatively low density, a high Young's modulus, and high chemical resistance [2]. Such properties are favorable for boron carbide applications as components resistant to abrasion in ball mills, nozzles, parts of machinery and equipment, or as parts of anti-ballistic armor [3]. Due to its high cross-section, boron carbide is used as an absorbing and screening material in the nuclear industry [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Boron Carbide Nanoparticles as Potential Boron-Rich Therapeutic Carriers

Kozień,

Żeliszewska,

Szermer-Olearnik

et al. 2023

Materials

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Boron carbide is one of the hardest materials in the world which can be synthesized by various methods. The most common one is a carbothermic or magnesiothermic reduction of B2O3 performed at high temperatures, where the obtained powder still requires grinding and purification. The goal of this research is to present the possibility of synthesizing B4C nanoparticles from elements via vapor deposition and modifying the morphology of the obtained powders, particularly those synthesized at high temperatures. B4C nanoparticles were synthesized in the process of direct synthesis from boron and carbon powders heated at the temperature of 1650 °C for 2 h under argon and characterized by using scanning electron microscopy, transmission electron microscopy, atomic force microscopy, X-ray diffraction analysis, and dynamic light scattering measurements. The physicochemical characteristics of B4C nanoparticles were determined, including the diffusion coefficients, hydrodynamic diameter, electrophoretic mobilities, and zeta potentials. An evaluation of the obtained B4C nanoparticles was performed on several human and mouse cell lines, showing the relation between the cytotoxicity effect and the size of the synthesized nanoparticles. Assessing the suitability of the synthesized B4C for further modifications in terms of its applicability in boron neutron capture therapy was the overarching goal of this research.

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The Effects of Carbon Content on the Anisotropic Deformation Mechanism of Boron Carbide

Cited by 7 publications

References 43 publications

Novel Pathway for the Combustion Synthesis and Consolidation of Boron Carbide

Novel Pathway for the Combustion Synthesis and Consolidation of Boron Carbide

First-Principles Predicting Improved Ductility of Boron Carbide through Element Doping

Synthesis and Characterization of Boron Carbide Nanoparticles as Potential Boron-Rich Therapeutic Carriers

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