Fabrication and characterization of hot-pressed B-rich boron carbide

Tian, Tian; Hu, Lanxin; Wang, Aiyang; Liu, Chun; Guo, Wenchao; Xu, Pengyu; He, Qianglong; Wang, Weimin; Wang, Hao; Fu, Zhengyi

doi:10.1016/j.ceramint.2022.01.248

Cited by 4 publications

(4 citation statements)

References 39 publications

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“…DFT simulations were used to calculate the theoretical shear strength increase of nanotwin r-LiB 13 C 2 , r-LiB 13 C 2 , and B 4 C, confirming that nanotwin r-LiB 13 C 2 increased by 4.9% compared to r-LiB 13 C 2 and by 14.7% compared to B 4 C. 17 Thus, a high density of twinned structures can effectively enhance strength. Additionally, compared to pure B 4 C, B 8.6 C, B 4 C-BN, and B 4 C-graphene ceramics in previous studies, [45][46][47] the mechanical properties of the 9LB ceramics have been improved. The flexural strength and fracture toughness of the sample exceeded 533 MPa and 3.71 MPa•m 1/2 , while the density was only 2.45 g/cm 3 .…”

Section: Resultsmentioning

confidence: 77%

“…Thus, a high density of twinned structures can effectively enhance strength. Additionally, compared to pure B 4 C, B 8.6 C, B 4 C–BN, and B 4 C–graphene ceramics in previous studies, 45–47 the mechanical properties of the 9LB ceramics have been improved. The flexural strength and fracture toughness of the sample exceeded 533 MPa and 3.71 MPa∙m 1/2 , while the density was only 2.45 g/cm 3 .…”

Section: Resultsmentioning

confidence: 79%

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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: Resultsmentioning

confidence: 77%

Section: Resultsmentioning

confidence: 79%

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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“…B 4 C ceramics is characterised by high melting point (2450 °C) and hardness (28)(29)(30)(31)(32)(33)(34)(35)(36)(37) as it is the third hardest material after diamond and cubic boron nitride. It has low density (2.52 g/cm 3 ) and high Young's modulus (360-460 GPa) [1][2][3][4][5]. It has good impact and wear resistance, excellent resistance to chemical agents as well as high capacity for neutron absorption [4,6,7].…”

Section: Introductionmentioning

confidence: 99%

“…Both the relative density of B 4 C-TiB 2 ceramic composite and the portion of TiB 2 secondary phase generally increase with these parameters. However, higher sintering temperature or longer sintering time lead to coarsening of the microstructure [2,6]. Favourable mechanical properties were reported in fully dense B 4 C-TiB 2 ceramic composites in several works and their values differ mainly depending on the portion of TiB 2 secondary phase.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of b4c-tib2 composites reactive sintered from B4C + TiO2 precursors

Švec

Čaplovič

2022

PAC

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Ceramic composites consisting of a boron carbide (B4C) matrix and titanium diboride (TiB2) secondary phase were obtained by reactive sintering from boron carbide powder with 40 and 50wt.% of titanium dioxide (TiO2) additive. The same sintering temperature of 1850?C and pressure of 35MPa, but different sintering times from 15 to 60min, were applied during reactive hot pressing of the composites in vacuum. The effects of TiO2 content and sintering time on phase compositions, microstructures and mechanical properties of the composites were studied. The TiO2 additive enhanced densification of the B4C-TiB2 ceramic composites. Both Vickers hardness and the fracture toughness of the composites increased with prolongation of sintering time. The highest hardness of 29.8GPa was achieved for the composite with 29.6 vol.% of TiB2 obtained by sintering of the precursor with 40wt.% of TiO2 additive for 60min. The fracture toughness reached a maximum value of 7.5MPa?m1/2 for the composite containing 40.2 vol.% of TiB2, which was fabricated by reactive sintering of the precursor with 50wt.% of TiO2 additive for 60min.

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