Influence of carbon nanotubes as secondary phase addition on the mechanical properties and amorphization of boron carbide

DeVries, Matthew; Subhash, Ghatu

doi:10.1016/j.jeurceramsoc.2019.01.032

Cited by 22 publications

(6 citation statements)

References 66 publications

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“…6,7 (ii) Reinforcement through the incorporation of carbon-based fillers like graphene, carbon nanotubes (CNTs), and carbon fibers. [8][9][10] (iii) Modification of the crystal chemical structure by adjusting the stoichiometric ratio (B/C ratio) or microalloying with atoms such as Si, Al, and Mg. [11][12][13] For example, Si dopants can replace B atoms (or vacancies) in the 3-atom chains connecting the icosahedra, mitigating stress-induced amorphization. This mechanism involves the twisting of 3-atom chains, deconstruction of icosahedra, and the formation of amorphous nano-shear bands during further deformation.…”

Section: Introductionmentioning

confidence: 99%

Densification of low‐density boron carbide by Li doping and its microstructural characterization

Pan,

Wang,

Zhang

et al. 2024

J Am Ceram Soc.

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Lithium (Li)‐doped boron carbide (B4C) has generated widespread attention for its potential to enhance mechanical properties. Nevertheless, the influence of the Li solid solution on the microstructure and mechanical properties of B4C ceramics remain unclear. In this research, the microstructure of Li‐doped B4C was investigated in meticulous detail. Through X‐ray diffraction, X‐ray photoelectron spectroscopy, and Raman spectroscopy analysis, it was confirmed that Li successfully solubilized in B4C at 1 500°C under 50 MPa for an 8 min, resulting in lattice expansion. Further insights from electron energy loss spectroscopy revealed the integration of Li into the crystal lattice and alterations in the C–B–C chains. Furthermore, the Li2O content significantly affected the densification and microstructure of B4C. Relative density increased from 91.2% (B4C) to 99.2% (9 wt.% Li2O–B4C), accompanied by a transition from a few intragranular planar defects to high‐density twins. Mechanical property tests demonstrated that 9 wt.% Li2O–B4C exhibited optimal comprehensive mechanical performance, with a flexural strength of 533 ± 27 MPa, fracture toughness of 3.71 ± 0.29 MPa∙m1/2, hardness of 33.3 ± 0.6 GPa, and a density of just 2.45 g/cm3, surpassing that of pure B4C.

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Section: Introductionmentioning

confidence: 99%

Densification of low‐density boron carbide by Li doping and its microstructural characterization

Pan,

Wang,

Zhang

et al. 2024

J Am Ceram Soc.

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“…Many attempts have been made to improve the mechanical properties of B 4 C, although there is no coherent view of the origin of amorphization in B 4 C. An et al − proposed that inserting nanoscale twins in B 4 C can significantly improve its intrinsic strength and fracture toughness, thereby mitigating the formation of amorphous bands. DeVries et al suggested that addition of carbon nanotubes to B 4 C can improve its mechanical properties by enhanced toughening. Reddy et al concluded that the compression strength, plasticity, and toughness of nanocrystalline B 4 C can be noticeably improved by introducing nanoporosity and weak amorphous carbon at grain boundaries.…”

Section: Introductionmentioning

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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“…Carbon fiber, 13‐16 SiC fiber, 17‐19 and CNTs 20‐23 are commonly introduced in the glass‐ceramic matrix to improve mechanical properties. However, these materials were found to show different drawbacks in the relative researches, such as the poor oxidation resistance of carbon fiber 24 ; the high price of SiC fiber; and the complex synthesis steps of CNTs 25 . Sialon, as a solid solution of Si 3 N 4 , consists of α‐Sialon, β‐Sialon, O‐Sialon, and X‐Sialon phases.…”

Section: Introductionmentioning

confidence: 99%

“…However, these materials were found to show different drawbacks in the relative researches, such as the poor oxidation resistance of carbon fiber 24 ; the high price of SiC fiber; and the complex synthesis steps of CNTs. 25 Sialon, as a solid solution of Si 3 N 4 , consists of α-Sialon, β-Sialon, O-Sialon, and X-Sialon phases. Among them, β-Sialon is known for the high fracture toughness and excellent thermal stability, making it superior over other reinforcement materials when dealing with high temperature.…”

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confidence: 99%

Synthesis and microstructure evolution of β‐Sialon fibers/barium aluminosilicate (BAS) glass‐ceramic matrix composite with enhanced mechanical properties

et al. 2021

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Barium aluminosilicate (BAS, BaO-Al 2 O 3 -2SiO 2 ) glassceramic material shows excellent thermal stability, high oxidation resistance, high melting point (1760°C), and low dielectric constant. These features have resulted in the widespread use of BAS composites in the area of integrated circuit substrate, electronic package, LCD monitor, refractory composites, and so on. [1][2][3][4][5][6][7][8][9][10][11][12] Whereas the intrinsic low toughness problem has restricted the wider range of applications. Carbon fiber, [13][14][15][16] SiC fiber, [17][18][19] and CNTs [20][21][22][23] are commonly introduced in the glass-ceramic matrix to improve mechanical properties. However, these materials were found to show different drawbacks in the relative researches, such as the poor oxidation resistance of carbon fiber 24 ; the high price of SiC fiber; and the complex synthesis steps of CNTs. 25 Sialon, as a solid solution of Si 3 N 4 , consists of α-Sialon, β-Sialon, O-Sialon, and X-Sialon phases. Among them, β-Sialon is known for the high fracture toughness and excellent thermal stability, making it superior over other reinforcement materials when dealing with high temperature. 4 So the combination of Sialon and BAS not only solves the fatal brittleness problem of BAS, but also improves the thermal performance of BAS matrix.It has been demonstrated that one-dimensional materials, such as nanowires, whiskers, and fibers, exhibit unique structures and properties, which are exploited to build up nano-scale reinforcements. [26][27][28][29] Significant efforts have been devoted for in situ synthesizing one-dimensional Sialon materials inside ceramic matrix materials. [30][31][32] In these researches,

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Influence of carbon nanotubes as secondary phase addition on the mechanical properties and amorphization of boron carbide

Cited by 22 publications

References 66 publications

Densification of low‐density boron carbide by Li doping and its microstructural characterization

Densification of low‐density boron carbide by Li doping and its microstructural characterization

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

Synthesis and microstructure evolution of β‐Sialon fibers/barium aluminosilicate (BAS) glass‐ceramic matrix composite with enhanced mechanical properties

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