CERAMICS INTERNATIONAL
·
2019
·Vol. 45
·期 6
·7916-7922
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IF 3.45
Ruichong Chen,Jianqi Qi,Xiaofeng Guo,Diyin Ye,Xiuling Wang,Qiwu Shi,Di Wu,Zhijun Liao,Tiecheng Lu
B 4 C hollow microspheres have been proposed as one of the promising ignition capsules for inertial confinement fusion (ICF). It is worth noting that the selection of easier-to-remove substrate materials is the key to obtaining B 4 C hollow microspheres . In this work, B 4 C core-shell microspheres with a uniform structure are prepared by the wet coating method on a PAMS substrate. After the calcination , the complete thermal decomposition of the PAMS substrate leads to a hollow structure B 4 C ceramic microsphere. The effects of solid content of coating slurry on the morphology and microstructure of the B 4 C core-shell microspheres were investigated in detail. The result shows that the spacing of the B 4 C particles in the slurry gradually decreases with increasing the solid content, resulting in an increase in the surface tension of the slurry and an improved stabilization, which helps to optimize the surface roughness and sphericity of the B 4 C microspheres.
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DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
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2026
·
IF 7.3
Ming Zhang,Zhanbo Li,Zihao Li,Jingjing Xie,Weimin Wang,Zhengyi Fu
B 4 C–TiB 2 composites with enhanced mechanical properties were fabricated by a hydrolysis-based coating process, followed by ball milling with stainless-steel media, and consolidated by reactive hot pressing. Milling with 9Cr18 stainless-steel balls introduced Fe–Cr debris, which generated a liquid phase during sintering, promoting the formation of coarse, plate-like (Ti,Cr)B 2 solid-solution grains and a newly formed FeB phase. The optimal flexural strength of 745.7 ± 37 MPa is achieved, attributed to solid-solution strengthening and improved microstructural homogeneity. Meanwhile, the highest fracture toughness and Vickers hardness of 5.40 ± 0.28 MPa m 1/2 and 37.4 ± 1.3 GPa are achieved when the milling time is prolonged to 3 h, representing a 27% and 9.67% improvement, respectively, compared to the composites without ball-milling treatment. These results demonstrate that controlled introduction of Fe–Cr debris by stainless-steel ball milling enables simultaneous enhancement of flexural strength, fracture toughness, and hardness in B 4 C–TiB 2 composites through liquid-phase sintering.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
Ruichong Chen,Jianqi Qi,Lin Su,Qiwu Shi,Xiaofeng Guo,Di Wu,Tiecheng Lu,Zhijun Liao
In this work, we report a rapid, simple and controllable approach to prepare B 4 C ceramic double-curvature shells by dropping the coating slurry on a molybdenum (Mo) substrate. The B 4 C slurry finally forms a nearly uniform spherical thin shell on the Mo substrates after drainage and curing process. We discovered that the uniformity and the wall thickness of the thin shell structure are controlled by the curing time and the viscosity of the slurry, respectively. This novel fabrication method not only provides an alternative way to prepare B 4 C ceramic double-curvature shells for the potential application as an ICF capsule, but also sheds light on the uniformity control of other ceramic double-curvature thin shells.
研究领域:
材料科学
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核聚变工程
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先进陶瓷制备
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表面涂层技术
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功能材料
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Chuandong Wu,Ruoyu Shi,Guoqiang Luo,Jian Zhang,Qiang Shen,Zhanghua Gan,Jing Liu,Lianmeng Zhang
The current study explores Al-Zn-Mg alloy reinforced with a high weight fraction of B 4 C particles as a model system to elucidate the relationship between the microstructure and mechanical behavior of submicron-grained, precipitation strengthened Al-based metal matrix composites (MMCs). Our results indicate that the incorporation of high weight fraction of B 4 C reinforcement particles can lead to a high dislocation density within the Al grains. Under identical aging condition, this results in an acceleration of the global precipitation kinetics compared to those of the unreinforced counterparts. The microstructures of the consolidated material and heat-treated material were characterized by a high density of plate-like η/η′, and some coarse “fiber-like” precipitates. The “fiber-like” precipitates were identified to be incoherent η 2 or η 4 precipitates. To elucidate the mechanical behavior of the composite, the contributions from various strengthening mechanisms were estimated using existing relationships. In addition, the effects of the reinforcement particles and precipitates on the fracture mechanisms are discussed.
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高影响因子
JOURNAL OF MATERIALS CHEMISTRY
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2011
·Vol. 21
·期 25
·9095-9102
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IF 5.101
Xinyong Tao,Yiping Li,Jun Du,Yang Xia,Yingchao Yang,Hui Huang,Yongping Gan,Wenkui Zhang,Xiaodong Li
Finding a general procedure to produce a whole class of materials in a similar way is a desired goal of materials chemistry. In this work, we report a new bamboo-based carbothermal method to prepare nanowires of covalent carbides (SiC and B4C) and interstitial carbides (TiC, TaC, NbC, TixNb1−xC, and TaxNb1−xC). The use of natural nanoporous bamboo as both the renewable carbon source and the template for the formation of catalyst particles greatly simplifies the synthesis process. Based on the structural, morphological and elemental analysis, volatile oxides or halides assisted vapour–liquid–solid growth mechanism was proposed. This bamboo based carbothermal method can be generalized to other carbide systems, providing a general, one-pot, convenient, low-cost, nontoxic, mass production, and innovative strategy for the synthesis of carbide nanostructures.
研究领域:
材料化学
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纳米材料科学
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2014
·
IF 2.726
Zhixiao Zhang,Chongjun Xu,Xianwu Du,Zili Li,Jilin Wang,Weihong Xing,Yuan Sheng,Weimin Wang,Zhengyi Fu
High-performance TiB 2 –SiC composites were fabricated with a new reaction system of B 4 C–TiC–Si by reactive hot pressing. The reaction process was controlled by the diffusion of boron atoms and hindered by the accumulated product layer of TiB 2 and C. The melting Si can offer another diffusion path for boron atoms, thereby promoting the reaction process. The Vickers hardness , flexural strength , and fracture toughness of the fabricated TiB 2 –SiC composites respectively reached 28.6 ± 0.6 GPa, 654 ± 49 MPa, and 6.8 ± 0.5 MPa m 1/2 . Both the intergranular fracture resulting from mismatch in thermal expansion coefficient between TiB 2 and SiC and the transgranular fracture resulting from the network structure of TiB 2 can enhance the fracture toughness of the TiB 2 –SiC composite.
研究领域:
材料科学
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机械工程
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Bo Xu,Fengyi Wang,Minxian Shi,Zhixiong Huang
Alumina fiber reinforced composites (AFC) have attracted massive attention in thermal protection materials due to their excellent high temperature mechanical properties. However, the application of the AFCs is restricted by their easy failure at high temperature condition for the sake of phase transition and grain growth. In this work, a series of alumina fiber based ceramizable composites modified with TiCN and B 4 C were prepared. The thermal stability, phase evolution, thermal insulation performance and anti-ablation mechanism of the composites were investigated. The flexural strength and residual weight yield of obtained ceramizable composite after static ablation at 1200 ℃ was 22.3 MPa and 85.8 %, showing obvious enhancement compared with those of the composite without ceramic fillers. The good ablation resistance and high temperature bearing capacity of the composites can be attributed to the formation of protective layer of rutile phase TiO 2 and the grain-refining effect of ceramic phase.
研究领域:
材料科学
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陶瓷
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热防护系统
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复合材料
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产品关联
DOI
高影响因子
Journal of Macromolecular Science Part B-Physics
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2023
·
IF 1.4
He Ding,Sige Huang,Xiaofan Liu,Zongyi Deng,Minxian Shi,Zhixiong Huang,Yue Wu
In order to investigate the effect of refractory metal on the high temperature properties of phenolic resin matrix composites, modified quartz fiber reinforced ceramizable composites were prepared by a molding process with a refractory component, tungsten, as the functional component and boron carbide as the ceramic forming agent. The effects of the tungsten and the boron carbide on the heat resistance of the composite were investigated. The results showed that the introduced refractory metal tungsten and the boron carbide can react to form tungsten borides and tungsten carbides at high temperature, and form a ceramic layer on the surface of the composite, which can fill the defects caused by pyrolysis of matrix and improve the high temperature performance of the composite. When the content of boron carbide was 10 wt% and the content of tungsten powder was 30 wt%, the flexural strength of the composite before and after heat treatment at 1200 °C were increased by 54.6% and 30.2% respectively compared with that without filler.
研究领域:
材料科学
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复合材料
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高温材料
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陶瓷材料
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聚合物基复合材料
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Xiaorong Zhang,Zhixiao Zhang,Yuming Liu,Yanming Wang,Xiying Fu,Yongmei Bai,Guangshuo Wang,Jingbo Mu,Xiaoliang Zhang,Hongwei Che
We studied the effects of particle size of raw materials (B 4 C, TiC and Si powders) on the characteristics of both TiB 2 –SiC composite powders and ceramics. Results show that the size of B 4 C and Si particles hardly affects the size of TiB 2 and SiC particles because B 4 C is decomposed and consumed during the formation of TiB 2 , and Si is melted during the formation of SiC. The size of SiC particles is within the nano and submicron scale. However, the size of TiC particles determines the sizes of TiB 2 particles and TiB 2 grains in the composite ceramics because TiC particles serve as templates to form TiB 2 particles. Consequently, the microstructure and mechanical properties of the TiB 2 –SiC composite ceramics are affected. The TiB 2 –SiC composites fabricated using nano-sized TiC powder possess smaller grain size, better dispersibility and more reasonable crack propagation path, thereby obtaining the optimal mechanical properties (Vickers hardness of 30.2 GPa, flexural strength of 732 MPa and fracture toughness of 7.37 MPa m 1/2 ).
研究领域:
材料科学
·
陶瓷工程
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Qiang Liu,Yang Wang,Xin-Yuan Hua,Biao Zhang,Hao-Qian Zhang,Jun-Wei Liu,Feng Ye,Wen Wang
Although traditional functionally graded materials (FGMs) have weakened a certain extent abrupt changes along interfaces between layers, eliminating residual abrupt interfaces which results in great inter laminar stresses remains a major challenge. Herein, ceramic scaffolds with novel continuously graded channels have been firstly prepared through combining layer-by-layer casting with gelation-freeze-dry. Followed by infiltrating soft phase, the co-continuous FGMs without delamination and abrupt changes between layers can be successfully fabricated. The wet layering of suspensions and continuous ice crystals across the interface are the main reasons for the eliminated interfaces. More importantly, the performance of FGMs can be optimized to meet the practical requirement attributed to the varied porosity and pore size distribution of freeze-cast ceramic scaffolds. The novel process for co-continuous ceramics/ FGMs without abrupt interfaces can be extended to other polymers or even metals.
研究领域:
材料科学
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复合材料工程
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Zeyi Wang,Rong Su,Maojie Zhao,Luyao Zhang,Lu Yang,Feng Xiao,Weishan Tang,Lichuan Chen,Ping He,Dingming Yang
The application of PbO 2 for electrochemical oxidation technology is limited by its low electrocatalytic activity and short service life. Herein, based on the facile one-step electrodeposition , we prepared a boron carbide (B 4 C) and cerium (Ce) co-modified Ti/PbO 2 (Ti/PbO 2 –B 4 C–Ce) electrode to overcome these shortcomings. Compared with Ti/PbO 2 electrode, the denser surface is displayed by Ti/PbO 2 –B 4 C–Ce electrode. Meanwhile, electrochemical characterization indicates that the introduction of B 4 C and Ce significantly enhance the electrochemical performance of PbO 2 electrode. In degradation experiments, under optimized conditions (current density 20 mA cm −2 , pH 9, 0.15 M Na 2 SO 4 and 30 °C), the fully degradation of tetracycline (TC) can be completed within 30 min. Furthermore, the trapping experiment demonstrates that ∙OH and SO 4 ·- radicals have a synergistic effect in the degradation process of TC. Based on results of liquid chromatography-mass spectrometer, the generated ·OH preferentially attacks amides, phenols and conjugated double bond groups in TC. Importantly, Ti/PbO 2 –B 4 C–Ce electrode maintains a constant degradation efficiency even after 10 recycling tests, and its service life is 2.4 times of traditional Ti/PbO 2 electrode. Hence, Ti/PbO 2 –B 4 C–Ce electrode is a promising electrode for degradation of organic wastewater containing amides, phenols, and conjugated double bond groups.
研究领域:
环境科学
·
电化学工程
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产品关联
DOI
PubMed
高影响因子
MATERIALS CHARACTERIZATION
·
2023
·
IF 4.7
Andong Hua,Yishi Su,Yunpeng Cai,He Cao,Kan Liu,Lichaoran Guan,Di Zhang,Qiubao Ouyang
A novel strategy of multistep ball milling was used to tune the multimodal grain structure in B 4 C microparticles and SiC nanowires hybrid reinforced 2024Al matrix composites (B 4 C/SiC/2024Al composites). During the ball milling process, SiC nanowires and 2024Al powders were added step by step, multimodal grain structure was achieved by different ball milling time. Then B 4 C microparticles were added and ball milled to achieve uniform dispersion of B 4 C microparticles and SiC nanowires. Multimodal grain structure was maintained in the subsequent preparation processes. Balanced strength and ductility were achieved in trimodal coarse grain (CG)/ fine grain (FG)/ ultrafine grain (UFG) structure, which exhibited yield strength of 616.7 ± 8.1 MPa, ultimate tensile strength of 714.6 ± 2.1 MPa and fracture elongation of 2.68 ± 0.12% with a comparable strength but doubled ductility as that in unimodal UFG structure. Significant toughening effect was achieved in the trimodal grain structure, which could be attributed to the hetero-deformation induced (HDI) hardening effect and the energy dissipation mechanism caused by the formation of a large number of SFs and the blunting effect of CG(FG) zones on crack tips. Therefore, multistep ball milling and powder metallurgy were confirmed an effective way to tune and fabricate multimodal grain structure with balanced strength and ductility in metal matrix composites .
研究领域:
材料科学
·
机械工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）