POLYMERS FOR ADVANCED TECHNOLOGIES
·
2018
·Vol. 29
·期 7
·1922-1929
·
IF 2.137
Yuanyuan Song,Lishuai Zong,Feng Bao,Guiyang Li,Zuoqiang Wu,Nan Li,Jinyan Wang,Xigao Jian
The effects of inorganic particles such as Al 2 O 3 and B 4 C on the solidification kinetics and heat resistance of phthalonitrile resin were investigated. The properties of the blends and the cured products were tested by rheometer, differential scanning calorimetry, Fourier transform infrared spectroscopy, and thermogravimetric analysis. The results revealed that B 4 C and Al 2 O 3 inorganic particles could prolong the gel time of phthalonitrile resin and broaden the processing window. The curing kinetic analysis showed that the presence of the particles could significantly reduce the curing activation energy of phthalonitrile resins by 72.38 kJ/mol down to 43.03 kJ/mol. Meanwhile, the heat resistance of the phthalonitrile resin was improved. Among them, the blend system combined with 30% B 4 C showed prominent thermoresistance. And while the T d5% weight loss temperature was 600°C, char yield at 1000°C was higher than 86% under nitrogen atmosphere; while the T d5% weight loss temperature was 581°C, char yield at 1000°C was higher than 80% under air atmosphere. Hence, the resulting resins were good candidate matrix of high-temperature structural composites.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·Vol. 47
·期 18
·25895-25900
·
IF 4.527
Daimeng Chen,Kuibao Zhang,Jianjun Zeng,Haiyan Guo,Bo Li,Baozhu Luo,Xuegang Huang
In this study, TiB 2 –B 4 C composite ceramics were prepared using Y 2 O 3 and Al 2 O 3 as the sintering aids . Different contents of B 4 C were added to seek promoted comprehensive mechanical properties of the composites. The mixed powders were sintered at 1850 °C under a uniaxial loading of 30 MPa for 2 h via hot-pressing. Through the measurement of XRD, SEM and related mechanical properties, the influence of B 4 C content on the microstructure and mechanical properties of TiB 2 –B 4 C composites ceramics was discussed. The experimental results show that TiB 2 –B 4 C composite ceramics exhibit excellent mechanical properties, which can be attributed to the dense microstructure and fine grain size . In addition, TiB 2 –B 4 C composite ceramic shows a relatively high comprehensive properties when the addition amount of B 4 C is 20 wt%. The relative density, Vickers hardness , fracture toughness and flexural strength are measured to be 99.61%, 27.63 ± 1.73 GPa, 4.77 ± 0.06 MPa m 1/2 , 612.5 ± 28.78 MPa, respectively.
研究领域:
材料科学
·
陶瓷
·
机械工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·Vol. 45
·期 6
·7761-7766
·
IF 3.45
Chuandong Wu,Ruoyu Shi,Jian Zhang,Guoqiang Luo,Qiang Shen,Zhanghua Gan,Jing Liu,Lianmeng Zhang
The three-layered structured AA7075-B 4 C systems functionally graded materials (FGMs) were successfully synthesized via plasma activated sintering (PAS). In the current study, the results indicated that the multi-level gradient structures, including the reinforcements, dislocations and precipitates, could be observed based on the microstructural characterization. This type of FGMs exhibited a significantly high bending strength of ~1291 MPa with AA7075 being loaded in tensile, which could be ascribed to the excellent bonding between different layers as well as the multi-level gradient structures.
研究领域:
材料科学
·
复合材料
·
机械工程
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DOI
高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-11
·
IF 4.259
Wu Chuandong,Ma Kaka,Zhang Dalong,Wu Jialu,Xiong Shuya,Luo Guoqiang,Zhang Jian,Chen Fei,Shen Qiang,Zhang Lianmeng,Lavernia Enrique J.
To provide insight into precipitation phenomena in age-hardening Al-Zn-Mg(-Cu) matrix composites, an Al 7075 alloy composite reinforced with B 4 C particles was selected as a model system. The bulk composites were fabricated via plasma activated sintering and followed by a peak aged (T6) heat treatment. Two types of Al matrix zones were identified in the composite: (1) the regions in the vicinity of the matrix/reinforcement interface, defined as “matrix plastic zone” (MPZ) hereafter, and (2) the regions away from the matrix/reinforcement interface, simply defined as matrix hereafter. The precipitation behavior in the MPZ was characterized and compared to that in the matrix. The MPZ contained a high density of dislocations. The number density of GP zones in the MPZ is lower than that in the matrix while the average size of the GP zones in MPZ is coarser. In addition, semi-coherent platelet η′ precipitates were observed but only in the MPZ. The dislocations and the Al/B 4 C interfaces provide more heterogeneous nucleation sites for the η′ precipitates in the MPZ. The growth and coarsening of the η′ precipitates caused rapid depletion of Mg and Zn solute atoms in the MPZ.
研究领域:
材料科学
·
金属基复合材料
·
物理冶金学
·
析出强化
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DOI
高影响因子
Materials Today Communications
·
2023
·
IF 3.8
Xianxiang Yao,Shuailing Ma,Wang Chen,Songpeng Zhang,Yanping Huang,Yongsheng Zhao,Wei Li,Xingbin Zhao,Hao Jiang,Qiang Tao,Pinwen Zhu,Tian Cui
Boron doped diamond are potential superhard materials with good electric conductivity . In this work, polycrystalline boron doped diamond (p-BDD) with different boron concentration were synthesized from the mixture of graphite and boron carbide under ultra-high pressure (15 GPa) and temperature (2500–2700 K). The results indicate that no more boron atoms can be inserted into diamond when the boron concentration is above 4 at%. The EELS spectra indicated that the boron atoms have been doped into the diamond grains, and surplus boron carbide locate at the grain boundary. The hardness measurements reveal that the p-BDD doped with 1 at% and 23 at% boron atoms exhibit high hardness of 78.5 GPa and 45 GPa, respectively, which is equivalent to the hardness of single crystal diamond and cubic boron nitride . The p-BDD is a semiconductor and transforms into superconductive state below 2.5 K. According to microstructure measurements, highly dense p-BDD and B 4 C bonded diamond exhibit superhard behavior because of the strong bonding of diamond grains by B 4 C additives. The oxidation temperature of these p-BDD specimens is around 1538 K in the air, which is far higher than diamond. B 4 C is demonstrated as a superior additive to sinter superhard and electric conductive p-BDD, which are extremely useful in areas where high hardness and electric conductive are highly desired.
研究领域:
材料科学
·
凝聚态物理
·
高压合成
·
超导材料
·
硬质材料工程
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DOI
高影响因子
Materials
·
2026
·Vol. 19
·期 13
·2708
·
IF 3.7
Yiyang Zhan,Zhengxin Li,Mu Qiao,Yujie Wang,Xuefei Fang,Yakun Lan,Guangli Zhu,Yuanmin Zou,Wenjie Yang,Chenyang Shi
Boron carbide (B4C) holds significant application potential in the fields of lightweight, high-hardness protective and high-end wear-resistant components due to its low density and exceptional hardness. However, its strong covalent bonding leads to low sintering activity and weak grain-boundary cohesion, resulting in high brittleness and crack sensitivity. These inherent properties make it difficult to achieve simultaneous full densification and toughness enhancement, severely limiting the reliability of B4C under complex service conditions. Although diamond is an attractive reinforcement because of its high elastic modulus and low coefficient of thermal expansion, the simultaneous realization of densification, graphitization suppression, and fracture-resistance improvement in diamond/B4C composites remains insufficiently understood. In this study, diamond particles were introduced into the B4C matrix and consolidated by rapid high-temperature and high-pressure (HTHP) sintering to synergistically promote densification and fracture toughening. The effects of sintering temperature and diamond content on phase evolution, densification, microstructure, and mechanical properties were systematically investigated, and the associated toughening mechanisms were analyzed. The results indicate that the hardness generally increases with rising sintering temperature and diamond content. The primary toughening mechanisms are identified as the pull-out of diamond particles and crack deflection induced by residual stresses generated during the cooling process. Although the composite with 20 wt.% diamond exhibits higher hardness, it also experiences severe macroscopic cracking. The composite with 10 wt.% diamond sintered at 1450 °C under 5.3 GPa for 4 min exhibits the optimal balance of properties, achieving a relative density of 98.85%, a Vickers hardness of 40.72 GPa, and a fracture toughness of 9.20 MPa·m1/2. This work confirms the effectiveness of combining diamond reinforcement with HTHP sintering in simultaneously achieving densification and toughening of B4C-based composites, providing a new pathway for developing high-performance lightweight protective ceramics.
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DOI
PubMed
高影响因子
POWDER TECHNOLOGY
·
2026
·
IF 5.5
Ceng Wang,Zhi-he Dou,Ting-an Zhang
Based on the magnesiothermic self-propagating in-situ synthesis (SHS) method, we systematically investigated the effects of intrinsic physical properties of five inorganic carbon sources - graphite, charcoal, activated carbon, carbon black, and carbon nanotubes (CNTs)-on the crystal growth behavior of Boron carbide (B 4 C). The results showed that different carbon sources exhibited significant differences in chemical composition, particle size distribution, and microstructure. These differences further affected their chemical reaction activity and significantly regulated the thermodynamic behavior and reaction kinetics during the self-propagating process. The structural characteristics of the carbon sources significantly affect the crystallization behavior and morphology-influenced growth of B 4 C products: Graphite shows low reaction reactivity due to its highly ordered layered structure, yielding B 4 C with the highest free carbon content (16.37 wt%), lowest crystallinity (11.75 wt%), and flake-like morphology. Charcoal and activated carbon have enhanced reactivity by porous structures, producing B 4 C with reduced free carbon content (4.61 wt%), improved crystallinity, and strip-like morphology. Carbon black exhibits excellent reactivity due to its amorphous structure and high defect density, resulting in B 4 C with the lowest magnesium residue (0.35 wt%), relatively high crystallinity, and regular fine-grained morphology. Carbon nanotubes possess high reactivity owing to their tubular nanostructure, generating B 4 C with the highest crystallinity (85.81 wt%) and solid columnar morphology. Starting from the correlation mechanism of carbon sources structure-reaction behavior-product morphology, this study provided a theoretical basis and experimental support for the directional regulation of B 4 C microstructure and properties.
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DOI
高影响因子
THIN-WALLED STRUCTURES
·
2025
·
IF 6.6
Xu Yaojie,Ma Yu,Zhang Hong,Huang Guangyan
Aramid fabrics (such as Twaron fabric) are widely used in flexible protective equipment due to their high strength and flexibility. Recent studies have shown that growing zinc oxide (ZnO) nanoparticles on fiber surface can enhance the ballistic performance of single-layer fabrics. However, the enhancement effect on multi-layer fabrics is not ideal. This work proposes a new method of modifying aramid fabrics with Boron Carbide/STF/ZnO (BSZ). The mechanical and friction properties of BSZ modified fabrics increased first and then decreased with the increase of shear thickening fluid (STF) solid content. The thickness of BSZ fabric only increased by 6.7% compared with neat fabric. Compared with neat fabric and ZnO modified fabric, the ballistic limit velocity ( v bl ) of single-layer BSZ fabric increased by 103.3% and 29.2%, respectively, and the areal density only increased by 7.1%. The v bl of three-layer BSZ fabric increased by 77.8% and 36.4% compared with neat and ZnO modified fabric, respectively. The enhanced protection of BSZ fabric can be attributed to friction gain, mechanical interlocking, stacking effect, and stress dispersion effect of nanoparticles. The discrepancy between numerical and experimental results was within 10%. The failure characteristics of the fabric in numerical simulation was highly consistent with the results in experiment, further indicating that BSZ modification improved the ballistic performance of the fabric by enhancing the inter-yarn friction, tensile properties, and particle diversity of the fabric.
研究领域:
材料科学
·
防护装备工程
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产品关联
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2023
·
IF 6.4
Yang Wang,Qiang Liu,Biao Zhang,Hongxu Wang,Paul J. Hazell,Bo Li,Tao Song,Ling Li,Futian Liu,Feng Ye
Functionally gradient materials (FGMs) primarily composed of a discretely layered structure with relatively sharp macroscopic interfaces are highly susceptible to interlayer failure under impact loading . Nacre is regarded as a model system for lightweight armor with high impact-resistant performance owing to its multiple length-scale and gradient structures. However, the simultaneous translation of both structural features into artificial assemblies remains challenging. Herein, we constructed new B 4 C/2024Al FGMs with eliminated sharp interfaces, which reproduced the hierarchical and gradient architectures of nacre. A combined experimental and numerical approach was employed to investigate the protective mechanisms of nacre-like FGMs subjected to 7.62 mm armor-piercing incendiary bullet, and two homogeneous composites were also tested under the same conditions for comparison purposes. The FGMs exhibited improved performance to resist ballistic attacks and maintain integrity compared with the uniform structures. As the ceramic contents decreased along the thickness, the energy dissipation mechanisms transitioned from eroding projectile to plastic deformation . The toughness gradient and varying energy dissipation modes prevented the formation of crushed cones at the ceramic-rich layers. The nacre-like structure created several extrinsic toughening mechanisms, which led to the increased energy-absorbing capability of the target. Meanwhile, the eliminated abrupt interfaces avoided the occurrence of interlayer tearing by diminishing the tensile wave strength and the sudden change of wave impedance, which prolonged the projectile-target interaction period and strengthened the eroding effect on the projectile. The present study opens new opportunities to design advanced lightweight FGMs armors with high impact-resistant protective performance.
研究领域:
材料科学
·
仿生学
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产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2020
·Vol. 17
·期 4
·1629-1635
·
IF 1.762
Meihua Hu,Ning Bi,Mingming Liu,Shangsheng Li,Taichao Su
TiB 2 –B 4 C composites were in situ synthesized and consolidated by high pressure synthesis method from a mixture of TiC and B powders at the pressure and temperature of 5.0 GPa and 1500℃-1900℃. The phase composition, microstructure, density, hardness, thermal conductivity, and electrical resistivity of TiB 2 –B 4 C composites were analyzed. As the increase in the synthesis temperature, the products were TiB 2 and B 4 C phases and that crystallinity improved. TiB 2 –B 4 C composites were dense without obvious pores. TiB 2 –B 4 C composites synthesized at 1800℃ obtained the optimized performance, including the relative density of 98.2%, the Vickers hardness of 31.7 ± 1.2 GPa with the load of 9.8 N, the thermal conductivity of 30.3 ± 0.7 W/(m K), and the electrical resistivity of 3.3 × 10 −3 Ω cm, respectively. The grain size of the TiB 2 –B 4 C composites changed with the increase in synthesis temperature, leading to the changes in hardness, thermal conductivity, and electrical resistivity.
研究领域:
材料科学
·
陶瓷
·
高压处理
·
复合材料
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Qiankun Xu,Qingliang Shan,Jianbao Hu,Yewei Wang,Yu Wang,Qian Ma,Changrong Chen,Yuqian Zhou,Anze Shui
The oxidation property of SiC-B 4 C- x Al 2 O 3 ( x ranges from 0 wt% to 30 wt%) ceramics was studied in air at 1400 ℃. Results show that the porous oxide layer becomes dense and smooth with addition of Al 2 O 3 . When the content of Al 2 O 3 is proper, the DOP (degree of polymerization) of borosilicate network can be improved with increase of Al 2 O 3 content, inhibiting the migration of atoms and molecular groups. With that, the crystallization of SiO 2 and volatilization of B 2 O 3 can be restrained. When the content of Al 2 O 3 is excessive, the DOP of borosilicate network will be decreased, deteriorating the oxide layer morphology. It is believed that the damage of borosilicate network by excess Al 2 O 3 should be responsible for this phenomenon. In this research, the SiC-B 4 C ceramic with optimal oxidation resistant can be obtained when the content of Al 2 O 3 is 15 wt%.
研究领域:
材料科学
·
无机非金属材料
·
高温材料
·
表面工程
·
陶瓷学
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·Vol. 47
·期 2
·118793
·
IF 6.3
Yiman Wang,Ming Zhang,Zhanbo Li,Weimin Wang,Wei Peng,Feng Jiang,Jingjing Xie,Zhengyi Fu
B 4 C–TiB 2 composites with an excellent combination of mechanical properties were consolidated at 1900 ℃ via a combined route of pre‑calcination and hot‑pressing. The effect of TiO 2 content (10 30 wt%) on boron carbide and sintering behavior was investigated. Increasing TiB 2 content accelerated densification, while the concomitant formation of non‑stoichiometric B x C with lattice distortion further enhanced the sintering activity. The pre‑calcination effectively reduced the formation of by‑products and suppressed particle agglomeration prior to sintering. The composite with 26 wt% TiB 2 achieved the best combination of properties: flexural strength of 774 ± 42 MPa, Vickers hardness of 35.1 ± 1.8 GPa, and fracture toughness of 3.17 ± 0.11 MPa·m 1/2 (SEVNB), representing a 58.5% improvement over monolithic B 4 C. Quantitative AFM analysis revealed increasing fracture roughness with TiB 2 content, corroborating enhanced crack‑propagation resistance.
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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）