MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
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2024
·
IF 6.1
Qianglong He,Wenchao Guo,Yunwei Shi,Aiyang Wang,Weimin Wang,Zhengyi Fu
In this study, B 4 C–TiB 2 –graphite ceramic composites were prepared via reactive hot-pressing sintering using B 4 C and TiC as the raw materials. The reaction process, microstructure, and mechanical properties were investigated. The solid-phase reaction is a diffusion-controlled process, wherein the B atoms diffuse into TiC and react to form TiB. Thereafter, TiB 2 is generated with the entry of subsequent B atoms. A core–shell structure is formed, wherein TiB 2 particles are wrapped by layered graphite. The products TiB 2 and graphite inhibit the growth of B 4 C matrix grains, which are instrumental in fine grain strengthening. In addition, the novel TiB 2 –graphite-agglomerated structure significantly improves the fracture toughness of the ceramic composites through crack deflection, bridging, and branching toughening mechanisms. Therefore, the comprehensive properties of B 4 C–TiB 2 –graphite ceramic composites are better than those of pure B 4 C ceramics. Specifically, the fracture toughness is approximately 6.77 MPa m 1/2 , which is considerably higher than that of pure B 4 C ceramics (2.47 MPa m 1/2 ).
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
Advances in Applied Ceramics
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2016
·
IF 1.162
X. J. Zeng,W. L. Liu
B4C green tapes are prepared by aqueous tape casting and a spark plasma sintering (SPS) process using polyethylenimine (PEI) as dispersant, hydroxypropyl methyl cellulose (HPMC) as binder and polyethylene glycol (PEG) as plasticiser. The influences of solid content, dispersant content, mass ratio of plasticiser to binder (R value) and milling time on the slurry viscosity are studied. The samples are characterised by means of hardness tester, universal testing machine and scanning electron microscopy. The results indicate that the solid content of B4C slurry achieves 47.5 wt-% with milling time of 12 h when the content of PEI, HPMC and PEG is 1.5, 5 and 5 wt-%, respectively. The relative density of B4C ceramics subject to SPS at 1600°C and 50 MPa for 8 min is up to 97.2%. The Vickers hardness, flexural strength and fracture toughness of B4C ceramics reach 36.5 ± 0.7 GPa, 510.3 ± 19.4 MPa and 5.04 ± 0.29 MPa m−1/2, respectively.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 25
·13989-14000
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IF 4.22
Wang Yang,Liu Qiang,Zhang Biao,Zhang Haoqian,Jin Yicheng,Zhong Zhaoxin,Ye Feng,Wang Wen
Freeze casting technique has become a promising way to assemble various components into multifunctional nacre-like materials. Surprisingly, although many ceramics materials have been processed by this approach, there are few studies reporting the structure–property-processing relationships of freeze-cast porous B 4 C ceramics. Here we generate bimodally lamellar porous B 4 C scaffolds by freeze casting and describe how processing parameters such as solid concentration and freezing front velocity control the architecture. The porosity, pore morphology and lamella thickness of B 4 C scaffolds can be tailored via altering such two parameters, which makes the scaffolds with excellent mechanical properties suitable as a support for the melt infiltration process. The pore morphology, structural characteristics, compressive mechanical response and fracture mechanism of the scaffolds are explored. Additionally, we have utilized a morphology map to identify the different structures such as lamellar and dendritic, which are formed by varying processing parameters. This study offers the freeze-cast scaffolds with custom-designed structure and mechanical properties for developing bioinspired multifunctional materials represented by B 4 C/Al composites.
研究领域:
材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE FORUM
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2016
·
IF 0
Wei Liang Liu,Min Wu,Zhong Tao Shi,Zhao Liang Xu,Jie Ping Ruan
B4C ceramic tapes were prepared by aqueous tape-casting with boron carbide powders as starting material, deionized water as solvent, polymine (PEI) as dispersant, polyethylene glycol (PEG) as plasticizer, poval (PVA) or gelatin as binders. The influences of pH, dispersant content, kind and content of binder on the stability and rheological property of tape slurries were studied. The experimental results indicated that, when the pH was ranged in 3-4, the slurries with good stability and good rheology could be obtained with 0.8 wt% PEI, 4.0 wt% PVA or 6.5 wt% gelatin. PVA as binder made cast tape with certain strength, and gelatin as binder made cast tape with poor strength.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
DOI
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2018
·Vol. 101
·期 8
·3617-3626
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IF 2.956
Deng Pan,Shufeng Li,Xin Zhang,Bo Pan,Shengyin Zhou,Yabo Fu,Katsuyoshi Kondoh
Strip-shaped W 2 B 5 reinforced B 4 C ceramic composites were prepared via in situ reaction of boron(B)-graphite(Gr)-WC system by powder metallurgy (P/M). In order to study the effect of the graphite content on the properties of the as-fabricated ceramic composites, the powder mixture of B-Gr-WC with various amounts of Gr powder were blended and consolidated by spark plasma sintering (SPS). The sintering parameters were shown as following: sintering pressure was set as 30 MPa; The three-step sintering temperature was 1100-1550-1700°C and the duration time was set as 5-5-6 minutes, respectively. In situ formed strip-shaped W 2 B 5 particles were dispersed homogeneously in B 4 C matrix, which resulted in a remarkable improvement on the fracture toughness and mechanical properties. Appropriate 5vol% residual Gr in the composite shows positive effect on the mechanical properties which achieved an optimal counter-balance of fracture toughness and hardness, the relative density was 99.8%, the Vickers hardness can reach 30.2 GPa, and the fracture toughness was 11.9 MPa·m 1/2 when the sintering temperature was set at 1700°C.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Wei-Ming Guo,Zhi-Lin Zhang,Jing-Xi Li,Yang You,Shang-hua Wu,Hua-Tay Lin
Al 2 O 3 –B 4 C ceramics had poor densification, due to the formation of Al 18 B 4 O 33 phase by reaction between Al 2 O 3 and B 2 O 3 on the surface of B 4 C. In the present work, Y 2 O 3 or Ti additive together with ZrO 2 from milling media were introduced into Al 2 O 3 –B 4 C ceramics. Results showed that Y 2 O 3 reacted with B 2 O 3 to produce YBO 3 phase, and removed Al 18 B 4 O 33 phase, resulting in the improved densification and the coarse microstructure. However, Ti and ZrO 2 reacted with B 2 O 3 to produce hard TiB 2 and ZrB 2 phases, removed the most of Al 18 B 4 O 33 phase, refined microstructure by pinning effect of hard particles, and improved densification and mechanical properties .
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Jing Xue,Yongzhao Hou,Wei Chu,Zhongya Zhang,Zhichao Dong,Lijuan Zhang,Guangwu Wen
B 4 C ceramic holds enormous application potential in the lightweight armors. In order to simplify the design of armor materials, 3D printed B 4 C-based honeycomb ceramic via DIW technique with high solid content were fabricated using printing ink with B 4 C powder, BYK-2070 dispersant, BAC solvent, PSZ adhesive and DCP cross-linking agent. The role of each constituent and the printing parameters of such honeycomb ceramic were investigated. In addition, epoxy resin was employed to impregnate PSZ-modified B 4 C-based honeycomb ceramic to prepare three-dimensional structure hybrid composites with excellent mechanical strength (172 MPa of flexural strength, 4.95 KJ/m 2 of impact strength) and physiochemical properties (7.52 % of open porosity, 5.5 % of water absorption, 1.35 g/cm −1 of density, and 5.2 GPa of hardness). The exceptional performances of the three-dimensional structure hybrid composite come from the bioinspired structure design, new chemical bonds (such as the formation of B–C, C–N and Si–B bonds) formed in the ceramic material and cross-linking reaction occurred during curing between epoxy resin and PSZ. The findings in this study provide an effective strategy for the fabrication of B 4 C-based composites with controllable structures and mechanical performances and exhibit the potential application in complex armor structures.
研究领域:
材料科学
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国防工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2017
·Vol. 100
·期 7
·3099-3107
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IF 2.841
Xiaorong Zhang,Zhixiao Zhang,Weimin Wang,Junhong Shan,Hongwei Che,Jingbo Mu,Guangsuo Wang
B 4 C–TiB 2 –SiC composites toughened by composite structural toughening phases, which are the units of (TiB 2 –SiC) composite, were fabricated through reactive hot pressing with B 4 C, TiC, and Si as raw materials. The units of (TiB 2 –SiC) composite with the size of 10-20 μm are composed of interlocking TiB 2 and SiC with the size of 1-5 μm. The addition of TiC and Si can effectively promote the sintering of B 4 C ceramics. The relative densities of all the B 4 C composites with different contents of TiB 2 and SiC are close to completely dense (98.9%-99.4%), thereby resulting in superior hardness (33.1-36.2 GPa). With the increase in the content of TiB 2 and SiC, the already improved fracture toughness of the B 4 C composite continuously increases (5.3-6.5 MPa·m 1/2 ), but the flexure strength initially increases and then decreases. When cracks cross the units of the (TiB 2 –SiC) composite, the cracks deflect along the interior boundary of TiB 2 and SiC inside the units. As the crack growth path is lengthened, the crack propagation direction is changed, thereby consuming more crack extension energy. The cumulative contributions improve the fracture toughness of the B 4 C composite. Therefore, the composite structural toughening units of the (TiB 2 –SiC) composite play an important role in reinforcing the fracture toughness of the composites.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Yang Wang,Qiang Liu,Biao Zhang,Junjie Ding,Haoqian Zhang,Yicheng Jin,Zhaoxin Zhong,Wen Wang,Feng Ye
To date, surprisingly few studies about the structure-property correlations in porous B 4 C ceramics with unidirectionally aligned channels have been reported. In this study, bimodally lamellar porous B 4 C ceramics aligned along the freezing direction were produced via freeze casting method using Al 2 O 3 –Y 2 O 3 as the sintering additive. The porosity, pore size distribution , morphology, and compressive strength could be effectively tailored by the addition of Al 2 O 3 –Y 2 O 3 . The volume shrinkage ranged from 1.66 to 2.42%, much lower than the reported values of porous ceramics . A low-melting eutectic liquid was observed to exert significant effects on the sintering and strength of the porous B 4 C ceramics. By varying the contents of the Al 2 O 3 –Y 2 O 3 sintering additive, the preforms displayed a rather high porosity of 78.71–82.01%, a low closed porosity of 0.37–0.86% and an excellent compressive strength of 1.76–3.28 MPa. Meanwhile, the wavelength, lamellar thickness, and pore diameter decreased as the Al 2 O 3 –Y 2 O 3 content increased. Adding Al 2 O 3 –Y 2 O 3 can tailor the structures of porous B 4 C ceramics prepared by freeze casting, which is of great significance for the preforms with low shrinkage, low density, high porosity, and satisfactory mechanical performance.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2020
·
IF 3.442
Xiuling Wang,Ruichong Chen,Diyin Ye,Dan Ruan,Jianqi Qi,Zhijun Liao,Tiecheng Lu
Boron carbide (B 4 C) ceramic hollow microspheres are considered to be a potential ignition capsule for inertial confinement fusion (ICF). B 4 C hollow microspheres with enhanced mechanical properties were obtained by pressureless calcination at low temperature with the addition of 2 wt% carbon nanotubes (CNTs). Notably, the microstructure of as-prepared microspheres directly reveals the strengthening mechanism is bridge toughening and pullout of CNTs. The density of B 4 C hollow microspheres reached 73.2% T.D. at 1000 °C when the doping amount of CNTs is 2 wt%. The crush load of B 4 C ceramic hollow microspheres (2 wt% CNTs) calcinated at 1000 °C is 25.3 N, while the crush load of the undoped samples under the same conditions is only 8.0 N. The improvement of mechanical properties of B 4 C hollow microspheres reduces the sensitivity of hollow microspheres to hydrodynamic instability in the high-temperature and high-pressure environment during fusion reaction, which can achieve relatively high fuel efficiency. Meanwhile, the B 4 C hollow microspheres with high surface finish and high strength as ICF target pellets can greatly reduce the influence of hydrodynamics instability on implosion and effectively improve the gain of the target.
研究领域:
材料科学
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核能工程
✓ 已验证
产品关联
DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
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2022
·
IF 3.752
Yang WANG,Qiang LIU,Biao ZHANG,Hao-qian ZHANG,Yi-cheng JIN,Zhao-xin ZHONG,Jian YE,Yu-han REN,Feng YE,Wen WANG
To address the issue that B 4 C ceramics are difficult to be wetted by aluminum metals in the composites, TiB 2 was introduced via an in-situ reaction between TiH 2 and B 4 C to regulate their wettability and interfacial bonding. By pressure infiltration of the molten alloy into the freeze-cast porous ceramic skeleton, the 2024Al/B 4 C–TiB 2 composites with a laminate-reticular hierarchical structure were produced. Compared with 2024Al/B 4 C composite, adding initial TiH 2 improved the flexural strength and valid fracture toughness from (484±27) to (665±30) MPa and (19.3±1.5) to (32.7±1.8) MPa·m 1/2 , respectively. This exceptional damage resistance ability was derived from multiple extrinsic toughening mechanisms including uncracked-ligament bridging, crack branching, crack propagation and crack blunting, and more importantly, the fracture model transition from single to multiple crack propagation. This strategy opens a pathway for improving the wettability and interfacial bonding of Al/B 4 C composites, and thus produces nacre-inspired materials with optimized damage tolerance.
研究领域:
材料科学
·
力学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Qi Song,Zhao-Hui Zhang,Zheng-Yang Hu,Shi-Pan Yin,Hao Wang,Zhen-Wu Ma
B 4 C ceramics were fabricated by spark plasma sintering with 5% (Ti 3 SiC 2 +Si) as sintering aid. The effects of sintering temperatures and sintering aid on microstructures and properties of B 4 C ceramics were investigated. The results indicated that the addition of a small amount of (Ti 3 SiC 2 +Si) could effectively improve the sintering characteristic of B 4 C ceramics and reduce the sintering temperature. The as-sintered ceramics fabricated at 1700 °C exhibited excellent mechanical properties , including a super-high Vickers hardness of 38.4 GPa, a high flexural strength of 457.6 MPa and a good fracture toughness of 5.61 MPa m 0.5 . Following reasons may be responsible for the improvement of the hardness of B 4 C ceramics: high relative density due to the combination use of (Ti 3 SiC 2 +Si) sintering aids and SPS technology, fine-grained structure of the B 4 C ceramics benefited from the low sintering temperature, formation of the second phases TiB 2 and SiC by chemical reaction and existence of the nano-sized unit of (TiB 2 +SiC) in B 4 C grains.
研究领域:
材料科学
·
陶瓷工程
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）