Microstructures and mechanical properties in B4C–CeO2 ceramics

Sun, Shuchen; Sakamoto, Tatsuaki; Nakai, Kenta; Kurishita, Hiroaki; Kobayashi, Sengo; Xu, Jianzhong; Cao, Haiyang; Gao, Bo; Bian, Xue; Wu, Wenyuan; Tu, Ganfeng; Matsuda, Seiji

doi:10.1016/j.jnucmat.2010.12.093

Cited by 16 publications

(10 citation statements)

References 9 publications

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“…However, the low fracture toughness and strength as well as poor machinability have limited their widespread use. In order to overcome those limitations, a great deal of effort has been performed to reinforce B 4 C ceramics using conventional toughing phase, such as Al 2 O 3 , TiB 2 , and CeO 2 . However, to the best of our knowledge, there has been no report so far on the use of graphene nanofillers to improve the mechanical properties of B 4 C ceramics.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Toughness in Boron Carbide with Reduced Graphene Oxide

Liu

Wang

et al. 2015

J. Am. Ceram. Soc.

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Ceramics typically have very high hardness, but suffer from poor toughness. Here, we use graphene to enhance the toughness of bulk boron carbide ceramics. The reduced graphene oxide (rGO) platelets are homogenously dispersed with boron carbide particles after sintering at 1350°C, under high pressure of 4.5 GPa with a multi-anvil apparatus. Fracture toughness of the composites is increased~131% (from~3.79 tõ 8.76 MPaÁm 1/2 ) at 1.5 vol% rGO platelets as a result of a toughing effect of graphene along with a little sacrificing of the hardness and elastic modulus, compared with those of pure boron carbide. The remarkably enhanced fracture toughness in the boron carbide ceramics is associated with graphene sheets crack bridging and graphene interface sliding effect. This study holds much significance for the understanding and development of high-performance graphene reinforcing ceramics.

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Section: Introductionmentioning

confidence: 99%

Enhancing Toughness in Boron Carbide with Reduced Graphene Oxide

Liu

Wang

et al. 2015

J. Am. Ceram. Soc.

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“…However, the low toughness and strength as well as poor damage tolerance have limited their widespread use as structural and functional materials 3,4 . As strength and plasticity of brittle materials are sensitive to the fabrication flaws that may act as stress concentrators or weak points for crack initiation and thereby catastrophic failure 5,6 , various attempts have been made to improve the sintering density of B 4 C ceramics with different sintering additives [7][8][9] . Although those sintering aids can increase the specific density of B 4 C, the fracture toughness, ductility and strength were only improved marginally 10,11 .…”

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confidence: 99%

Enhanced mechanical properties of nanocrystalline boron carbide by nanoporosity and interface phases

et al. 2012

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Ceramics typically have very high hardness, but low toughness and plasticity. Besides intrinsic brittleness associated with rigid covalent or ionic bonds, porosity and interface phases are the foremost characteristics that lead to their failure at low stress levels in a brittle manner. Here we show that, in contrast to the conventional wisdom that these features are adverse factors in mechanical properties of ceramics, the compression strength, plasticity and toughness of nanocrystalline boron carbide can be noticeably improved by introducing nanoporosity and weak amorphous carbon at grain boundaries. Transmission electron microscopy reveals that the unusual nanosize effect arises from the deformation-induced elimination of nanoporosity mediated by grain boundary sliding with the assistance of the soft grain boundary phases. This study has important implications in developing high-performance ceramics with ultrahigh strength and enhanced plasticity and toughness.

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“…Studies show that using the common rare earth oxides such as Y 2 O 3 , CeO 2 , La 2 O 3 , Nd 2 O 3 , Dy 2 O 3 , Eu 2 O 3 , and Sm 2 O 3 as sintering additives can greatly improve the sintering performance of B 4 C ceramics 17–19 . CeO 2 is proved to have the effective function on enhancing sintering of B 4 C 20,21 . Xu et al 20 .…”

Section: Introductionmentioning

confidence: 99%

“…16 Studies show that using the common rare earth oxides such as Y 2 O 3 , CeO 2 , La 2 O 3 , Nd 2 O 3 , Dy 2 O 3 , Eu 2 O 3 , and Sm 2 O 3 as sintering additives can greatly improve the sintering performance of B 4 C ceramics. [17][18][19] CeO 2 is proved to have the effective function on enhancing sintering of B 4 C. 20,21 Xu et al 20 fabricated B 4 C-CeB 6 composites with CeO 2 as the additive. When the CeO 2 content is 4%, the B 4 C-CeB 6 composites had the optimal properties, of which the flexural strength and fracture toughness reached 346.7 MPa and 5.…”

Section: Introductionmentioning

confidence: 99%

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Performance of B₄C/CeB₆ composites fabricated via hot pressing under different processes

Chen

Wang

et al. 2022

Int J Applied Ceramic Tech

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In this work, CeO2 sintering additive reinforced B4C ceramic composites were prepared by hot‐pressing reaction sintering under different processes of low temperature–long holding time (1980°C, 30 MPa, 3 h, 4 wt% CeO2) and high temperature–short holding time (2050°C, 30 MPa, .5 h, 4 wt% and 6 wt% CeO2). The effect of sintering process and CeO2 content on the microstructure and mechanical properties of B4C‐CeB6 composites were investigated. The existed impurities in the obtained composites were also analyzed. Results show that CeO2 is an active sintering additive. CeB6 is formed by the reaction between CeO2, B4C and C in sintering process. The densification of B4C ceramics is enhanced, and the grains can be refined by the formed CeB6, which promotes the strength. The thermal expansion coefficient mismatch, crack deflection, and fracture mode change caused by the in situ formed CeB6 improve the toughness. The process of low temperature–long holding time is more suitable for playing the role of CeO2 additive in sintering of B4C, under which condition the relative density, flexural strength, fracture toughness, and hardness reach 99%, 417 MPa, 5.32 MPa·m1/2, and 30.66 GPa, respectively. The impurities in the composites are the kinds of Ti‐contained, C‐O‐Mg‐Ca‐contained, C‐O‐Ca‐S‐contained, and Si‐contained impurities.

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Microstructures and mechanical properties in B4C–CeO2 ceramics

Cited by 16 publications

References 9 publications

Enhancing Toughness in Boron Carbide with Reduced Graphene Oxide

Enhancing Toughness in Boron Carbide with Reduced Graphene Oxide

Enhanced mechanical properties of nanocrystalline boron carbide by nanoporosity and interface phases

Performance of B₄C/CeB₆ composites fabricated via hot pressing under different processes

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Microstructures and mechanical properties in B4C–CeO2 ceramics

Cited by 16 publications

References 9 publications

Enhancing Toughness in Boron Carbide with Reduced Graphene Oxide

Enhancing Toughness in Boron Carbide with Reduced Graphene Oxide

Enhanced mechanical properties of nanocrystalline boron carbide by nanoporosity and interface phases

Performance of B4C/CeB6 composites fabricated via hot pressing under different processes

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Product

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Performance of B₄C/CeB₆ composites fabricated via hot pressing under different processes