JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Zihan Wang,Qianglong He,Shifeng Ren,Aiyang Wang,Weimin Wang
B 4 C–TiB 2 –graphite ceramic composites were fabricated via reactive hot pressing using B 4 C and TiC as the raw materials. With an increase in the TiC content, the grain size of B 4 C decreased continuously because B 4 C grain growth was inhibited by the TiB 2 and C reaction products. However, excessive TiC content caused an increase in TiB 2 and graphite grain size and the formation of TiB 2 –graphite agglomerates. When the composition of the ceramic composite was 95.1 wt%B 4 C–3.9 wt%TiB 2 –1.0 wt%graphite, the Vickers hardness and bending strength was optimized at 34.9 GPa and 688 MPa, respectively. The results showed that crack deflection is the main toughening mechanism of B 4 C–TiB 2 –graphite ceramic composites, and the effect of TiB 2 –graphite on crack propagation is particularly significant. When the composition of the ceramic composite was 75.6 wt%B 4 C–19.4 wt%TiB 2 –5.0 wt%graphite, the fracture toughness was optimized at 6.77 MPa·m 1/2 . These results provide guidelines on how to effectively control the combined properties of B 4 C–TiB 2 –graphite ceramic composites in future investigations.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Weixiang Yang,Jincui Ren,Yanzi Tang,Yidan Wang,Yunuo Yang
To improve oxidation resistance of alumina-carbon refractories, SiO 2 -B 4 C-glass composite coating was prepared by slurry brushing method. The coated sample was heat treated in argon atmosphere to improve compactness and oxidation resistance of the coating. Effects of heat treatment temperature and time on microstructure and oxidation resistance of the coating were studied. Results showed that after heat treatment at 800 °C, borosilicate glass powder in the coating melted into glass phase, which could fill holes and cracks of the coating. As heat treatment temperature increased to 900 °C, viscosity of the glass phase decreased, resulting in the better self-healing ability and oxidation resistance of the coating. When heat treatment time increased to 1.5 h, some glass phases flowed away from the coating surface due to its large fluidity, so oxidation resistance of the coating decreased. When heat treatment temperature was too high (1000 °C), B 2 O 3 in the glass powder was eutectic with SiO 2 , more glass phase with larger fluidity generated, which leaded to that thickness and oxidation resistance of the coating both decreased. After heat treatment at 900 °C for 0.5 h, microstructure of the coating was smooth and compact, leading to its good oxidation resistance. Weight loss of the coated sample was only −1.041 % after oxidation at 800 °C for 80 h.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
Transactions of the Indian Ceramic Society
·
2025
·
IF 1.5
Yuting Li,Mingyong Jia,Yueqi Wu,Chi Zhang,Yaojun Lin,Fei Chen
Integrating boron carbide ceramics (B4C) with tungsten (W) presents great potential for the development of advanced shielding materials. This study focuses on achieving exceptional bonding between B4C and W by fine-tuning the graded interfaces guided by the comprehensive thermodynamic reaction information. The results show that as the W content increases in the graded interlayers, the unstable entropy between B4C and W system drives the reaction progress along the following stages, W2B5 → W2B5 + WB → WB + WC → W2B + W2C. The multi-scale cracks within B4C/W composites and B4C/W graded materials are mainly due to mismatched properties and inherent brittleness of the induced interphases, which can be effectively mitigated by reducing phases such as WB and WC.
研究领域:
材料科学
·
工程学
✓ 已验证
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2023
·Vol. 20
·期 4
·2229-2238
·
IF 2.1
Zhonghuai Yi,Yi Sun,Ning Zhang,Huiwen Xiong
The miniaturization and mobility of nuclear reactors have become an important trend in the development of nuclear energy. In order to simplify the design of shielding materials with improved complexity and reduced weight, 3D B 4 C-W-based composites were fabricated via fused deposition molding using highly-filled granular feedstocks containing 62 vol% B 4 C-W powders (boron carbide accounted for 30 wt% and tungsten for 70 wt%) and 38 vol% polymer binders (60 wt% Carnauba wax, 22 wt% polypropylene, 13 wt% polystyrene, and 5 wt% stearic acid). The rheological properties and microstructure of the feedstock and extruded filaments were clarified. Roles of the printing parameters including extrusion temperature, platform temperature and deposited-layer height in the morphology of 3D composites were investigated in detail. Extruded filaments with good shape retention, dense fracture surface, and uniformly dispersed B 4 C-W grains were achieved, benefiting from the smooth printing and shear thinning behaviour of the feedstock. Defects including warping, small pores or stacking pores could be formed under improper printing parameters, owing to the poor bonding strength between deposited layers induced by thermal internal stress or decomposition of wax. 3D composites with large size of 130 × 130 × 5 mm were fabricated, which showed a satisfactory compressive strength of 34.8 MPa. This work showed a facile route to fabricate 3D radiation shielding materials based on highly-filled polymers.
研究领域:
材料科学
·
核能工程
·
增材制造
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Shaoxiong Weng,Zongyi Deng,Zhixiong Huang,Minxian Shi,Yuzhan Lu
The carbon fiber (CF) reinforced boron phenolic resin (BPR) matrix composite, renowned for its exceptional ablation resistance, represents a promising material for high-temperature applications. However, hypersonic vehicles are subjected to increasingly challenging service environments, which necessitate materials capable of enduring even more extreme temperatures. Consequently, there is a growing need for composites that exhibit superior ablation resistance. To tackle these demanding requirements, this research initiative introduces the integration of ceramizable fillers, including TiB2, B4C, and ZrC, into the composite structure to create a high-temperature ceramizable system. The experimental findings indicate that the composites formulated with this innovative system demonstrate extraordinary ablation resistance, even when exposed to oxyacetylene flames with a heat flux of 4364 kW/m 2 . Notably, the measured linear ablation rate and mass ablation rate were recorded at −0.012 mm/s and 0.0268 g/s, respectively. These values are exceptionally low. Subsequent analysis utilizing X-ray diffraction (XRD) and additional characterization techniques has confirmed the formation of a dense ceramic layer with a B-C-O-Ti-Zr composition on the composite surface at elevated temperatures. This ceramic layer acts as a formidable barrier, significantly mitigating the ablation effects caused by high-temperature exposure. Meanwhile, it is pertinent to note that the formation of the ceramic layer is accompanied by an endothermic reaction, which consequently leads to a reduction in the thermal conduction of the composite to some extent.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Shidong Song,Limei Yu,Yanli Ruan,Jian Sun,Butian Chen,Wu Xu,Ji-Guang Zhang
Irreversible parasitic reactions and the resulting accumulation of insulating side products are main barriers for practical application of rechargeable lithium–oxygen (Li O 2 ) batteries . Therefore, it is critical to develop multifunctional oxygen electrodes suitable for oxygen reduction reaction , oxygen evolution reaction , and decomposition of side reaction products. Here we report the application of ultrafine ruthenium on boron carbide (Ru/B 4 C) with highly efficient multifunctional activities as carbon-free oxygen electrodes for Li O 2 batteries. Li 2 CO 3 and LiOH can be completely decomposed by Ru/B 4 C at 4.0 V and 4.1 V, respectively, within the stability window of the electrolyte. A Li O 2 battery using the Ru/B 4 C oxygen electrode achieves low overpotentials for Li O 2 reactions, and excellent cycling performance under the capacities of 300 and 500 mAh g −1 Ru/B4C . In-situ gas chromatography analysis reveals that O 2 is the major gas product during charging. Only a negligible amount of CO 2 is observed in the first charging process. Therefore, Ru/B 4 C can be a very promising oxygen-electrode material for Li O 2 batteries and Li–air batteries operated in ambient air.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
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
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Lanxin Hu,Aiyang Wang,Tian Tian,Chun Liu,Wenchao Guo,Qianglong He,Hao Wang,Jingjing Xie,Weimin Wang,Zhengyi Fu
In this study, B 4 C–SiC–rGO composites with different SiC contents were prepared by spark plasma sintering at 1800 °C for 5 min under a uniaxial pressure of 50 MPa. The effects of SiC on the microstructures and mechanical properties of the B 4 C–SiC–rGO composites were investigated. The optimal values for flexural strength (545.25 ± 23 MPa) and fracture toughness (5.72 ± 0.13 MPa·m 1/2 ) were obtained simultaneously when 15 wt.% SiC was added to 5 wt.%–GO reinforced B 4 C composites (BS15G5). It was found that SiC and rGO inhibited the grain growth of B 4 C and improved the mechanical properties of the B 4 C–SiC–rGO composites. The clear and narrow grain boundaries of rGO–B 4 C and rGO–SiC, as well as the semi-coherent B 4 C–SiC interface, indicated strong interface compatibility. The twin structures of SiC and B 4 C observed in the composites improved their fracture toughness. Crack deflection and crack bridging caused by the SiC grains as well as rGO bridging and rGO pull-out were observed on the crack propagation path.
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
·
2024
·
IF 5.1
Zonglong Gao,Zhuan Li,Guoyuan Wen,Jiaqi Wu,Ye Li,Hongying Nie,Mengting Wei
In braking materials field, MAX phase has been introduced into Cu-based composite materials to address issues such as inadequate wetting between ceramic particles and the metal matrix. This study focuses on preparing Ti 2 AlN-ZrO 2 -B 4 C reinforced Cu-based materials via the powder metallurgy method, and investigates the effects and mechanisms of different Ti 2 AlN/ZrO 2 ratios on the mechanical, thermal, and tribological properties of these materials. The addition of an appropriate amount of Ti 2 AlN (3 wt%) can enhance the densification and mechanical properties of Cu-based materials, as the diffusion of Al atoms promotes the sintering process. Similarly, the diffusion of Al also improves the thermal conductivity at grain boundaries, resulting in samples with higher Ti 2 AlN content exhibiting superior thermal diffusivity. When the Ti 2 AlN content reached 7 wt%, the material exhibited optimal hardness (43.35 ± 1.05 HBW), moderate shear strength (19.84 ± 1.86 MPa), as well as excellent high initial braking speed friction coefficient and stability. The reinforcement primarily arises from the diffusion bonding between Ti 2 AlN and Cu, leading to the formation of Cu-Ti compounds at the interface, which facilitates Ti 2 AlN in providing frictional force during the friction process and promotes the formation of a friction film due to the “pinning effect”. Additionally, the layered structure of Ti 2 AlN and the subsequent formation of amorphous Al 2 O 3 after oxidation contributed to the enhancement of friction stability.
研究领域:
材料科学
·
机械工程
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2016
·
IF 2.647
Chuandong Wu,Kaka Ma,Jialu Wu,Pan Fang,Guoqiang Luo,Fei Chen,Qiang Shen,Lianmeng Zhang,Julie M. Schoenung,Enrique J. Lavernia
We report on an investigation of the influence of reinforcement particle size on the microstructure and mechanical behavior of Al metal matrix composites . In our work, Al 7075/B 4 C composites containing three types of B 4 C particle sizes (56.9 µm, 4.2 µm and 2.0 µm) were synthesized and studied. For a constant value of volume fraction of B 4 C, the composite with coarse reinforcement particles exhibited a relatively homogeneous and discrete distribution of the B 4 C particles while the composites with fine reinforcement exhibited agglomeration of the B 4 C particles. The composite with the smallest B 4 C particles possessed the highest yield strength and fracture strength. Quantitative analysis of the strengthening mechanisms revealed that smaller B 4 C particles lead to larger values in strain gradient strengthening as well as CTE mismatch strengthening, which are significantly correlated to the geometrically necessary dislocations caused by the presence of B 4 C. In addition, the different spatial distributions of the B 4 C particles contributed to different fracture mechanisms in the composites.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Wenhao Du,Fanhao Zeng,Yafang Gao,Ziwei Wang,Meiyan Chen,Zhi Li
Increasing the high-temperature anti-oxidation time of Carbon/carbon(C/C) composites faces significant challenges for conventional coatings. Herein, a unique bi-layer coating of HfC-TaC-B 4 C-SiC(HTBS)/ZrSiO 4 -glass(ZA) was proposed and prepared through slurry sintering method, and their oxidation behavior and mechanism were investigated. The results show that after oxidation at 1673 K in air for 750.5 h, the mass loss of the coated C/C was only 3.48% with about 720 h of weight gain oxidation, indicating that the anti-oxidation time has increased by two or three times compared to traditional coatings. The improved oxygen resistance performance was mainly attributed to the hinder layer of Si/Hf-Ta-Si-O during oxidation, which grew with the simultaneous carbothermal reduction reaction of SiO near matrix and oxidation reaction of HTBS. This is beneficial to lowering the thermal mismatch of coating system, reducing the connected thermal stress cracks as oxygen permeation channels. Our findings provide a new insight on improving the long-time thermal protection performance of C/C composites.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xueyuan Yang,Linxuan Li,Minxian Shi,Zhixiong Huang,Zongyi Deng
The inherent susceptibility to oxidation limits the application of carbon fibre/phenolic resin composites (CF/Ph) in the thermal protection of hypersonic vehicle engines. Herein, TiB 2 -B 4 C modified Al-coated carbon fibre/boron phenolic resin ceramizable composites were fabricated. The optimal ceramizable composite (T 30 C 10 ) exhibited excellent ablation resistance and high-temperature insulation capacity at a linear ablation rate and bottom-surface temperature of −0.00768 mm/s and 129.8 °C, respectively. Oxygen consumption and inhibition, carbon fixation, and self-healing effects contributed to the excellent ablation resistance, and the effects of the Al coatings and carbothermal reduction reactions led to excellent high-temperature insulation capacities.
研究领域:
材料科学
·
航空航天工程
✓ 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）