JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2025
·
IF 14.3
Zhixiong Huang,Yuzhan Lu,Shaoxiong Weng,Guoqin Jiang,Wanglin Ying,Zongyi Deng
The rapid development of reusable hypersonic vehicles has put forward urgent demand for reusable large-area thermal protection materials. Herein, a novel ceramizable composite modified by Ti 3 AlC 2 and B 4 C was proposed, and its long-term oxidation resistance and reusability after isothermal cyclic high-temperature oxidation experiment at 1200°C for 30 min for 1–10 cycles were explored. The high-temperature bending strength after treated once reached 80.0 MPa, and it kept above 43 MPa and the structural integrity of the samples was good even after eight high-temperature oxidation treatments, demonstrating that the ceramizable composite possessed good application potential as reusable large-area thermal protection materials. The anti-oxidation mechanism was proposed based on microstructure evolution, element distribution, phase evolution, and thermodynamics analyses during the high-temperature oxidation cycles. Ti 3 AlC 2 and B 4 C underwent a series of ceramization reactions with O 2 and pyrolytic carbon (PyC), converting the ceramizable composite into a ceramized composite in-situ and playing the roles of oxygen consumption, self-healing, oxygen inhibition, carbon fixation, and heat absorption, by which carbon fibers and PyC were protected.
研究领域:
材料科学
·
航空航天工程
·
高温材料学
·
复合材料学
·
热防护系统
·
固态化学
·
结构材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2016
·
IF 2.933
Rong Tu,Nian Li,Qizhong Li,Song Zhang,Lianmeng Zhang,Takashi Goto
B 4 C-HfB 2 composites were prepared by arc-melting using B 4 C and HfB 2 as raw materials. The eutectic composition of B 4 C-HfB 2 system was 70B 4 C-30HfB 2 (mol%) with a lamellar eutectic microstructure. HfB 2 about 1 μm in thickness was dispersed in B 4 C matrix uniformly of the eutectic composite, much smaller than raw powders. At the eutectic composition, the B 4 C-HfB 2 composites showed the maximum Vickers hardness (31.2 GPa) and fracture toughness (5.3 MPa m 1/2 ) at room temperature, and maximum thermal expansion coefficient (7.1 × 10 −6 K −1 ) from 293 to 1273 K. The electrical and thermal conductivity of B 4 C-HfB 2 composites increased with increasing HfB 2 content. The electrical conductivity of B 4 C-HfB 2 eutectic composites decreased from 8.94 × 10 4 to 7.43 × 10 4 Sm −1 with increasing temperature from 298 to 800 K, showing a metallic electrical behavior. The thermal conductivity of B 4 C-HfB 2 eutectic composite was 16–18 WK −1 m −1 from 298 to 973 K.
研究领域:
材料科学
·
陶瓷与复合材料
·
机械工程
·
热工学
·
材料电学性能
✓ 已验证
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2023
·Vol. 38
·期 6
·1262-1268
·
IF 1.6
Ding Jie,Li Yan,Shi Minxian,Huang Zhixiong,Qin Yan,Zhuang Yingluo,Wang Cunku
The composites were prepared by modifying silicon carbide fiber with particles of zirconium carbide (ZrC) and boron carbide (B 4 C) and incorporating them into a phenolic resin matrix. The influence of ZrC and B 4 C on the mechanical performance of SiC f /phenolic composites after high-temperature pyrolysis was studied through flexural performance test. The results show that the composite material has good thermal stability and high-temperature mechanical properties. After static ablation at 1 400 °C for 15 minutes, the flexural strength of the composite material reaches 286 MPa, which is still 7.3% higher than at room temperature, indicating that the composite material still has good mechanical properties even after heat treatment at 1 400 °C.
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2026
·Vol. 109
·期 9
·e71219
·
IF 4.2
Ming Zhang,Zhanbo Li,Feng Jiang,Jingjing Xie,Weimin Wang,Zhengyi Fu
Pressure-assisted sintering of high-performance boron carbide (B 4 C) into complex shapes remains a significant challenge. In this study, a near‑net‑shape B 4 C hemisphere was successfully prepared by hot pressing using a specially designed mold. The uniform dispersion of nano‑Al 2 O 3 within the B 4 C matrix, achieved via a hydrothermal process, enhances both sinterability and mechanical properties. A pressure-induced phase transformation from Al 2 O 3 to Al 18 B 4 O 33 is identified at applied pressures exceeding 40 MPa, which tailors the densification rate and determines the final phase assemblage. The as‑obtained hemisphere achieved full density, exhibited uniform thickness, and was free of internal defects, demonstrating a viable route to break the conventional performance–geometry trade‑off in B 4 C‑based ceramic components.
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Li Huaxin,Luo Ziqiang,Xiang Zhi,Li Yafei,Shi Chen,Lu Chuanyang,Yang Jianguo,He Yanming
The preparation of N-doped conductive SiC ceramics through conventional solid-state sintering typically requires extremely high temperatures and additional nitrogen solid solution treatments. To overcome this limitation, pre-synthesized N-doped SiC nanopowder containing 1 wt.% B 4 C were used to fabricate solid-sintered conductive SiC ceramics via spark plasma sintering (SPS) at sintering temperatures of 1850–1900 °C and holding times of 1–10 min. Localized overheating during SPS induced the formation of B-Si–O-C-N liquid phase within the ceramic matrix, a phenomenon not observed in conventional solid-state sintering processes, which significantly promoted densification. Notably, short holding times (1–5 min) preserved the liquid phase, resulting in incomplete solid-state sintering. In contrast, a prolonged holding time (10 min) led to complete decomposition and evaporation of the liquid phase, thereby inducing pores formation. The fracture toughness of the resulting ceramics exceeded 4 MPa·m 1/2 , outperforming those produced via traditional routes. Additionally, the N concentration remained below 1000 ppm, while the electrical resistivity ranged from 2.68 × 10 –1 to 4.12 × 10 –2 Ω·cm, well below the 100 Ω·cm threshold required for electrical discharge machining. Furthermore, competitive doping between N and B atoms modulated the carrier concentration and mobility, enabling effective tuning of electrical resistivity. Based on these findings, the densification mechanism and doping interaction effects were thoroughly elucidated. This work provides a foundation for optimizing the solid-state sintering process and designing high-performance conductive ceramics for advanced engineering applications.
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2022
·
IF 7.693
Mingchao Wang,Zilong Liang,Shuoqing Yan,Xin Tao,Yunling Zou,Jiangtao Li,Xiaomeng Zhou,Haijun Zhang
In response to high environmental requirements, an incombustible inorganic intumescent flame retardant coating was prepared from amorphous aluminum phosphate emulsion as the matrix, with boron carbide as the modifier. The influence of boron carbide (B 4 C)on the fire resistance performance and physic-chemical properties of coatings were studied by means of large panel combustion method, smoke density test, Fourier transformed infra-red analysis (FTIR), thermogravimetric analysis (TGA), X-ray diffraction (XRD), scanning electron microscopy (SEM), specific surface area (BET method) and pore size analysis. With the addition of 0.75 wt% B 4 C, the backside temperature of APB3 coating (aluminum phosphate-based coating modified with 0.75 wt% B 4 C) after an hour was only 140 ℃, 33.4 % lower than that of blank APB0 coating. And the smoke density (Ds) of APB3 was only 64.73 %, 36.3 % lower than that of blank APB0. The foaming expansion caused by decomposition reactions, the structural improvement caused by boron carbide oxidation, and the formation of ablative resistant ceramics and glass were the main reasons for excellent flame retardant and thermal insulation performance. Remarkably, the melting B 2 O 3 generated from the oxidation of B 4 C could repair cracks, modify pore structure, improve the integrity of closed pores, increase the specific surface area of porous structure, and promote the formation of borosilicate glass. Due to the structural integrity of the outermost coating surface caused by the oxidation of B 4 C and the construction of borosilicate glass, much gas was shielded inside the coating, making the coating more eco-friendly. Besides, APB3 coating has good water resistance. After immersion in water for 360 h, the reduction rate of fire resistance performance of the coating was only 17.1 %. This work provides theoretical guidance for broadening the types of intumescent coatings and promotes the development of inorganic green coatings.
研究领域:
材料科学
·
防火安全工程
✓ 已验证
产品关联
DOI
高影响因子
Inorganics
·
2025
·Vol. 13
·期 12
·402
·
IF 3
Xiangqi Lu,Hongbo Chen,Yufei Gu,Jun-Liang Chen,Jie Gao,Kun Hu,Weijiang Gan,Zhongmin Wang,Huajun Lai,Lei Miao
Silicon-based thermoelectric (TE) materials are demonstrating advanced capacity in environmental waste heat recovery. However, intrinsically high lattice thermal conductivity hinders the improvement of TE conversion efficiency. In the present work, a study of B4C composite for in situ nano-inclusions was carried out to enhance the TE properties of p-type Si80Ge20materials. During sintering, B4C was demonstrated to form the SiC and B-rich ternary with a SiGe-based matrix, and the in situ formation of diverse nano-inclusions and the B dopant significantly reduced lattice thermal conductivity without deteriorating power factor (PF), weakening the coupling relationship between thermal and electrical transport properties to a certain extent. The carrier concentration of SiGe alloy samples was significantly increased, resulting in a 7.8% enhancement ofPFfor Si80Ge20B0.5-(B4C)0.3at 873 K, while a low lattice thermal conductivity of 0.69 W m−1K−1is achieved. The optimalZTis 1.08, which increased ~50% compared to the pristine sample, and an excellent averageZTavgof 0.62 is obtained among recent p-type SiGe-based TE materials’ works. Our research provides a new perspective for the optimization and practical application of p-type silicon germanium TE materials.
研究领域:
材料科学
·
热电学
·
能量转换
·
纳米材料
·
固体物理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2017
·
IF 6.395
H.R. Jiang,W. Shyy,M.C. Wu,L. Wei,T.S. Zhao
The potential of B 4 C as a metal-free catalyst for vanadium redox reactions is investigated by first-principles calculations. Results show that the central carbon atom of B 4 C can act as a highly active reaction site for redox reactions , due primarily to the abundant unpaired electrons around it. The catalytic effect is then verified experimentally by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) tests, both of which demonstrate that B 4 C nanoparticles can enhance the kinetics for both V 2+ /V 3+ and VO 2+ /VO 2 + redox reactions, indicating a bi-functional effect. The B 4 C-nanoparticle-modified graphite felt electrodes are finally prepared and tested in vanadium redox flow batteries (VRFBs). It is shown that the batteries with the prepared electrodes exhibit energy efficiencies of 88.9% and 80.0% at the current densities of 80 and 160 mA cm −2 , which are 16.6% and 18.8% higher than those with the original graphite felt electrodes. With a further increase in current densities to 240 and 320 mA cm −2 , the batteries can still maintain energy efficiencies of 72.0% and 63.8%, respectively. All these results show that the B 4 C-nanoparticle-modified graphite felt electrode outperforms existing metal-free catalyst modified electrodes , and thus can be promising electrodes for VRFBs.
研究领域:
电化学
·
能源材料
·
催化化学
·
储能技术
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Macromolecular Science Part B-Physics
·
2024
·
IF 1.2
Wei Zhang,Guoqin Jiang,Yang Liu,Zongyi Deng,Zhixiong Huang,Xueyuan Yang
Carbon fiber/phenolic resin composites (CF/Ph) are often used on the surface of hypersonic vehicles as thermal protection materials. In this paper, the composite materials were prepared by a compression molding process with carbon fiber and boron phenolic resin modified by TiC and B4C. The high-temperature flexural strength and anti-ablation behavior of the composites (TB) were studied. The results showed that the residual weight yield at 1500 °C of TB-10 (B4C content of 10 phr) increased by 39.22% compared to that with no B4C (TB-0). The flexural strength of TB-10 was increased by 19.51% and 19.69% at 1400 °C and 1600 °C, respectively, with respect to TB-0 at the same temperatures. The linear ablation rate and mass ablation rate of TB-10 were reduced by 24.32% and 5.58%, respectively, compared with TB-0. By exploring the anti-ablative mechanisms, it was revealed that PyC, liquid B2O3 and TiO2, all of which were formed at high temperatures, tended to fill the inner cracks of the composite and, therefore, prevent the oxide to further diffuse in. Along with the outer ceramic layer, the three components above play a synergistic effect to improve the ablative property.
研究领域:
材料科学
·
航空工程
·
复合材料
·
高温技术
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Zhiren Guo,Xinyue Liu,Jinlei Song,Hansheng Li,Dongxiang Zhang,Ting Liu,Xinyuan Li,Antonio Juan Dos Santos-García,Xiyan Xu,Jiatao Zhang
Conventional type-II heterojunctions broaden visible-light absorption and enhance charge separation but weaken redox potentials via charge migration, reducing thermodynamic driving force for surface catalysis. A novel direct Z -scheme heterojunction photocatalyst was constructed by decorating B 4 C with TiO 2 nanoparticles for efficient solar-driven degradation of 1,2-benzisothiazolin-3-one and other biocidal pollutants. The optimized TiO 2 /B 4 C photocatalyst achieved 98% BIT degradation within 4 h under simulated solar irradiation, with an apparent rate constant of 1.00 h −1 , approximately 38 and 6.2 times higher than those of pristine B 4 C and TiO 2 , respectively. The incorporation of B 4 C broadened visible-light absorption and promoted interfacial charge separation, while the formation of an internal electric field enabled a direct Z -scheme charge-transfer pathway that preserved strong redox potentials. As a result, photogenerated electrons accumulated on B 4 C and generated O 2 •− radicals, whereas holes retained on TiO 2 produced • OH radicals, jointly driving the oxidative degradation of pollutants. Electron Spin Resonance and radical scavenger analyses confirmed O 2 •− and • OH as the key reactive species. Density functional theory (DFT) calculations further elucidated the interfacial charge-transfer mechanism and the degradation pathway of BIT. This work demonstrates that the TiO 2 /B 4 C Z -scheme heterojunction provides an efficient strategy for solar-driven photocatalytic removal of biocidal pollutants, providing insights into rational design of high-performance photocatalysts for environmental remediation.
✓ 已验证
产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2025
·
IF 7.4
Shuangshuang Tian,Chi Yao,Zuolin Huang,Nnditshedzeni Eric Maluta,Ming Yang,Xiaoxing Zhang
Microencapsulated flame retardants with high thermal stability and efficacy are critical for polymer safety. Conventional systems often face issues like poor shell stability and low char residue, leading to early core release and reduced flame-retardant performance. This study presents a novel approach using a silane coupling agent (KH-550) to integrate surface-hydroxylated nano boron carbide (B 4 C) into a melamine-urea-formaldehyde (MUF) shell. Using perfluoro(2-methyl-3-pentanone) (PMP, C 6 F 12 O) as the core material, we developed BMP (B 4 C&MUF@PMP) composite microcapsules through in situ polymerization. These microcapsules, with 6 wt% B 4 C, showed a smooth spherical morphology, sealed micropores, and enhanced thermal stability, with a 5% weight loss temperature rising from 78.3°C to 123°C and char residue increasing from 0.88% to 6.91%. When incorporated into epoxy resin, the EP/BMP composite achieved a limiting oxygen index of 31.2%, passed the UL-94 V-0 rating, and reduced peak heat release rate and total heat release by 48.7% and 48.8%, respectively, while suppressing CO generation. This approach strengthens the MUF shell via B 4 C integration, enabling controlled PMP release and synergistic flame retardancy through a dense char layer, offering a new pathway for high-performance flame-retardant microcapsules.
研究领域:
材料科学
·
高分子化学
·
火灾安全工程
·
纳米复合材料
·
阻燃材料
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·Vol. 45
·期 6
·7916-7922
·
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.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）