Morphology characteristics and mechanical properties of hot-pressed micron/sub-micron boron carbide ceramics

Boron carbide-based ceramics will be probably the most promising materials during the next decades due to their excellent mechanical properties combined with its chemical stability and low-density. Boron carbide itself is a very challenging system because of its complicated but highly-symmetrical crystallographic structure. Room-temperature mechanical properties of pure boron carbide have deserved considerable attention due to its remarkable hardness and resistance to shock-impact; however, its high-temperature plasticity with unsual ductility remains unexplored. The high-temperature creep of pure B4C polycrystals and the microsturctural observation were performed to find the mechanism of deformation in this material.

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Microstructure and mechanical properties of fine-grained boron carbide ceramics fabricated by high-pressure hot pressing combined with high-energy ball milling

Ceramics International ◽

10.1016/j.ceramint.2018.03.114 ◽

2018 ◽

Vol 44 (9) ◽

pp. 10766-10772 ◽

Cited By ~ 6

Author(s):

Xiaorong Zhang ◽

Zhixiao Zhang ◽

Bin Nie ◽

Huanyu Chen ◽

Yanming Wang ◽

...

Keyword(s):

Mechanical Properties ◽

High Pressure ◽

Boron Carbide ◽

Ball Milling ◽

Hot Pressing ◽

High Energy ◽

High Energy Ball Milling ◽

Fine Grained ◽

Energy Ball ◽

Carbide Ceramics

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Fabrication and Mechanical Properties of Boron Nitride Nanotube Reinforced Boron Carbide Ceramics

10.21203/rs.3.rs-67675/v1 ◽

2020 ◽

Author(s):

Bingsai Liu ◽

Yuanping Gu ◽

Yuchun Ji ◽

Guoyuan Zheng ◽

Feiwen Ma ◽

...

Keyword(s):

Mechanical Properties ◽

Fracture Toughness ◽

Particle Size ◽

Boron Nitride ◽

Boron Carbide ◽

Sintering Temperature ◽

Composite Ceramic ◽

Boron Nitride Nanotubes ◽

The Matrix ◽

Carbide Ceramics

Abstract A series of BNNTs/B4C composite ceramic were prepared by the spark plasma sintering (SPS) technology using boron carbide (B4C) powders as the matrix and boron nitride nanotubes (BNNTs) as the toughening phase. The XRD, SEM, TEM and HR-TEM were used to characterize the B4C samples. The influence of sintering temperature, BNNTs content and matrix particle size on the microstructures and mechanical properties of B4C composite ceramics, as well the toughening mechanism were investigated in detail. The experimental results showed that changing the particle size of the powder, increasing the sintering temperature and adding BNNTs could significantly improve the mechanical properties of the material. The ceramic samples obtained by adding 5wt.% BNNTs content sintered at 1750℃ displayed the best mechanical properties. Its relative density, microhardness and fracture toughness respectively were 99.41%, 32.68 GPa and 6.87 Mpa·m1/2, respectively. In particular, the fracture toughness value of the BNNTs/B4C composite ceramic was 54.59% higher than that of B4C ceramics without BNNTs.

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Does grain size have an influence on intrinsic mechanical properties and conduction mechanism of near fully-dense boron carbide ceramics?

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2019.05.037 ◽

2019 ◽

Vol 795 ◽

pp. 408-415 ◽

Cited By ~ 4

Author(s):

Bibi Malmal Moshtaghioun ◽

Miguel Angel Laguna-Bercero ◽

Diego Gómez-García ◽

Jose I. Peña

Keyword(s):

Mechanical Properties ◽

Grain Size ◽

Boron Carbide ◽

Conduction Mechanism ◽

Carbide Ceramics

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Gelatin tailored pore structure and mechanical properties of freeze-cast porous boron carbide ceramics

Ceramics International ◽

10.1016/j.ceramint.2020.09.111 ◽

2021 ◽

Vol 47 (2) ◽

pp. 2897-2902

Author(s):

Yang Wang ◽

Qiang Liu ◽

Biao Zhang ◽

Haoqian Zhang ◽

Yicheng Jin ◽

...

Keyword(s):

Mechanical Properties ◽

Boron Carbide ◽

Pore Structure ◽

Carbide Ceramics

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Microstructural and Mechanical Properties of Boron Carbide Ceramics by Methanol Washed Powder

MRS Proceedings ◽

10.1557/proc-1224-ff10-35 ◽

2009 ◽

Vol 1224 ◽

Cited By ~ 1

Author(s):

Jong Pil Ahn ◽

Kyoung Hun Kim ◽

Joo Seok Park ◽

Jae Hong Chae ◽

Sung Min So ◽

...

Keyword(s):

Mechanical Properties ◽

Boron Carbide ◽

Sintering Behavior ◽

Hot Press ◽

Homogeneous Microstructure ◽

High Temperature Materials ◽

Microstructural Coarsening ◽

Carbide Ceramics ◽

Hot Press Sintering ◽

B4c Powder

AbstractBoron carbide (B4C) is currently used in lightweight armors and high temperature materials, because it has high meting point, good hardness, low specific gravity and good mechanical properties. The sintering of boron carbide, however, is restricted by its high covalent bonding and B2O3 coatings on B4C particles surface which can cause a microstructural coarsening during sintering. Therefore, it is necessary to remove B2O3 film of By4C particles surface to restrict microstructural coarsening and densification of B4C. B4C ceramics were fabricated by a hot-press sintering and its sintering behavior, microstructure and mechanical properties were evaluated. The relative density of B4C ceramics were obtained by a hot-press sintering reached as high as 99% without any sintering additives. The mechanical properties of B4C ceramics was improved by a methanol washing which can remove B2O3 phase from a B4C powder surface. This improvement is resulted from the formation of homogeneous microstructure because the grain coarsening was suppressed by the elimination of B2O3 phase. Particularly, the mechanical properties of the sintered samples using a methanol washed powder improved compared with the samples using an as-received commercial powder.

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