JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2015
·
IF 2.947
Cuiwei Li,Chao Bian,Yao Han,Chang-An Wang,Linan An
Mullite whisker reinforced porous anorthite ceramics have been fabricated by foam-gelcasting method. Effect of whisker content on thermal conductivity and mechanical strength of the prepared material has been studied. It is found that while thermal conductivity remains almost the same, compressive strength can be significantly improved by increasing whisker content. The results are discussed in terms of microstructures. It suggests that porous anorthite ceramics with both high mechanical strength and low thermal conductivity can be achieved by reinforcing with mullite whiskers.
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
Polymers
·
2021
·Vol. 13
·期 18
·3093
·
IF 4.329
Qiu-Wanyu Qing,Cheng-Mei Wei,Qi-Han Li,Rui Liu,Zong-Xi Zhang,Jun-Wen Ren
Materials with excellent thermal stability, mechanical, and insulating properties are highly desirable for electrical equipment with high voltage and high power. However, simultaneously integrating these performance portfolios into a single material remains a great challenge. Here, we describe a new strategy to prepare composite film by combining one-dimensional (1D) rigid aramid nanofiber (ANF) with 2D alumina (Al2O3) nanoplates using the carboxylated chitosan acting as hydrogen bonding donors as well as soft interlocking agent. A biomimetic nacreous ‘brick-and-mortar’ structure with a 3D hydrogen bonding network is constructed in the obtained ANF/chitosan/Al2O3composite films, which provides the composite films with exceptional mechanical and dielectric properties. The ANF/chitosan/Al2O3composite film exhibits an ultrahigh electric breakdown strength of 320.1 kV/mm at 15 wt % Al2O3loading, which is 50.6% higher than that of the neat ANF film. Meanwhile, a large elongation at break of 17.22% is achieved for the composite film, integrated with high tensile strength (~233 MPa), low dielectric loss (<0.02), and remarkable thermal stability. These findings shed new light on the fabrication of multifunctional insulating materials and broaden their practical applications in the field of advanced electrics and electrical devices.Keywords:aramid nanofiber;hydrogen bonds;electric breakdown strength;mechanical strength;alumina nanoplates
研究领域:
材料科学
·
仿生学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2019
·
IF 6.282
Yu Dai,Chenbo Meng,Zheng Cheng,Longbo Luo,Xiangyang Liu
Poor adhesion to resin and low axial compressive strength are two prominent problems for application of aramid in fiber-reinforced composites. Simultaneously enhancing interfacial shear strength (IFSS) and compressive strength is still challenging. Herein, 4-(bromomethyl) benzoic acid (BBA) was utilized as external cross-linker to modify (Poly-p-phenylene-benzimidazole terephthalamide) (PBIA) fibers through post-swelling process. It was confirmed that bromomethyl groups of BBA could react with benzimidazole units of PBIA upon 80 °C and carboxyl of BBA could form cross-linking upon 300 °C by decarboxylation coupling reaction. Therefore, both surface grafting and bulk cross-linking can be obtained simultaneously by controlling temperature during modification process. After modification, IFSS and compressive strength of PBIA fibers are enhanced by nearly 27% and 100% respectively while maintaining excellent mechanical properties . Therefore, the method is nearly non-destructive and effective to simultaneously improve IFSS and compressive strength of PBIA fibers.
研究领域:
材料科学
·
复合材料工程
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2024
·
IF 6.3
Yue Yao,Hanqi Qian,Dan Qi,Jinrui Bai,Chao Liu
As widely used lightweight and high-strength materials, the sustainable development of thermosetting composites is hampered by their limited recyclability. Developing simple methods for the efficient and upgraded recycling is desirable but challenging. Herein, carbon fiber reinforced degradable thermosetting resin composites were prepared, and the effects of resin degradation process and its derivatives on the sustainable recycling of carbon fiber were studied. Through the tunable departure and re-adsorption of degradation derivatives in cleaning post-treatment, recycled carbon fibers achieved not only non-destructive recovery but also simultaneously improvements in tensile strength from 3.0 GPa to 3.7 GPa and surface energy from 47.2 mN/m to 66.7 mN/m. The adhered derivatives, rich in -NH- and oxygen-containing groups, exhibited good interactions with the fiber surface and epoxy resin. Benefiting from this, the inter laminar shear strength of recycled carbon fibers reinforced epoxy composite effectively improved 24.3 %. In this work, directly reusing resin degradation products for the recycling of reinforced fibers was proposed and the key role of the composition and distribution of degradation products in recycling properties was revealed. The strategy of integrating characteristics of components to enhance material recyclability is expected to have widespread applicability, promoting the sustainable transition for thermosetting composites.
研究领域:
材料科学
·
可持续发展
✓ 已验证
产品关联
DOI
高影响因子
Journal of Superconductivity and Novel Magnetism
·
2023
·Vol. 36
·期 7
·1737-1750
·
IF 1.8
Shan Shuo,Li Jie,Li Pengwei,Wang Yonglun,Pi Siwen,Zhao Xuan
BaFe 12− x Nb x O 19 ( x = 0.00, 0.04, 0.08, 0.12, 0.16, and 0.20) with a nominal composition for M-type hexagonal barium ferrite was prepared using solid-state sintering methods. The microstructure and magnetic properties of hexaferrite were characterized using X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, field-emission scanning electron microscopy (FESEM), and vibrating-sample magnetometry (VSM). XRD results revealed that the crystal structure of barium ferrite remained intact after Nb doping, maintaining a single barium ferrite phase. FESEM confirmed the hexagonal crystal structure of the sample. Energy-dispersive X-ray spectroscopy showed increased Nb content and decreased Fe content without the formation of other elements. FTIR revealed bands at 598 and 445 cm −1 corresponding to tetrahedral and octahedral clusters, respectively. The VSM test showed that the saturation magnetization ( M s ), residual magnetization ( M r ), and coercivity ( H c ) initially increased and then decreased with increasing Nb doping, reaching maximum values of 92.297 emu/g, 44.256 emu/g, and 3367.53 Oe, respectively, at x = 0.08.
研究领域:
材料科学
·
磁学
✓ 已验证
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2021
·
IF 7.664
Guangming Yang,Qin OuYang,Jinrui Ye,Ling Liu
A new carbon nanotube (CNT)/graphene (GN) grid structure is prepared and used to reinforce and health-monitor the epoxy composites. Results reveal that with a 30–50% mesoscopic-porosity of the CNT/GN grid, tensile strength and single-lap-shear (SLS) strength of the CNT/GN/epoxy composites can be improved by 27–41% and 28–49%, respectively. Also, relative resistance change (Δ R / R 0 %) at damage initiation would sudden change more than 10% for the tensile testing and 6% for the SLS testing. Meanwhile, during the damage evolution stage, the gauge factor obtained from tensile testing reaches 10.2–24.9 improved by 23–200%, and Δ R / R 0 % from SLS testing achieves 47.4–60.4% increased by 69–116%, respectively, when compared to the baseline composite. Moreover, an equivalent resistance prediction mode for the CNT/GN grid composites is proposed and which can well explain the resistance response mechanism. The result reveals that the gridded CNT/GN sensor is potential in reinforcing and structural health monitoring the epoxy resin-based composites.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Zhenyu Sun,Yingfeng Zuo,Ping Li,Yiqiang Wu,Zhangheng Wang,Xingong Li,Jianxiong Lyu
High-strength, dimensionally-stable, moisture-absorbing, and heat-insulating materials are critical for ensuring the safety of building structures and human comfort. As a natural moisture-adjusting and heat-insulating material, wood is widely used in buildings, but its low strength and flammability pose safety hazards. This paper reports a simple method to construct an organic-inorganic hyperbranched structure in poplar wood (W Si-Al-EP ). The bending and compressive strength of W Si-Al-EP reached 103.50 MPa and 80.41 MPa, respectively. This composite wood material exhibited high strength and stable performance, and it also improved the shortcomings of traditional inorganic-modified materials such as unstable sizes and the loss of modifiers. Moreover, the material did not burn in a long-term high-temperature flame, indicating its heat and combustion resistance, and showing that it can be used in wooden building structures.
研究领域:
材料科学
·
木材工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Shuai Wang,Anzhe Wang,Pan Gao,Rui Bai,Junjie Liu,Peng Zhou,Dazhao Liu
Strength prediction under the action of pores is crucial for the safety of ceramics. Here, a quantitative prediction model of pore-strength response under mode-I loading was developed based on the new mapping relationship between stress intensity factor and tip radius. The new model was proved to have great application after comparison and analysis of the pore-strength test data of three typical ceramics as well as the pertinent data as-reported in the literature. Results indicated that when the tip radius of pore ( ρ ) exceeds the critical value ( ρ c = K Ic 2 /(π σ 0 2 )), the stress intensity factor increases as a power function with increasing ρ , at which point the strength decay is significantly weakened, and when the ρ is lower than the ρ c , the pore can be equated to a crack problem. This work can not only forecast and assess the failure strength of ceramics containing pores, but also provide guidance for the design of extremely dependable ceramics.
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
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Yanan Shang,Yu Feng,Changhai Zhang,Tiandong Zhang,Qingguo Chi
The excellent properties of natural biomaterials can provide useful inspiration for the optimal design of artificial materials. Inspired by the distribution of vascular bundles in the cross-section of bamboo, this work designs a series of topological functional gradient composite dielectric with insulating fillers or polarized fillers, and analyzes the breakdown path evolution by stochastic breakdown simulation. Experimental results demonstrate that the topological functional gradient can regulate the breakdown strength and polarization strength of the composite dielectric, and then obtain an enhanced energy storage density. However, the effect of structural regulation on the improvement of polymer performance varies depending on the material combination, and in this experiment, structural regulation can play the most positive role when the selected filler has similar dielectric properties to the matrix. This work supplies a useful reference for the construction of functional gradient structures and material system combinations.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2022
·
IF 9.879
Yinchuan Pu,Zhenyu Ma,Li Liu,Yongping Bai,Yudong Huang
It was a major challenge to acquire CFRPs with both great toughness and strength . Inspired by spider silk , a biomaterial with impressive toughness, we discovered that introducing highly dense weak hydrogen bonds at the interface can be applied to CFRPs toughening. Highly dense weak hydrogen bonds between the branched polyethyleneimine (PEI) and metal-organic frameworks UIO-66 at the interface of CFRPs were formed by the “bridge” of hydroxyl-rich poly (vinyl alcohol) (PVA). The break of those hydrogen bonds could dissipate substantial energy and disperse the stress, the impact toughness of CFRPs with the “PEI-PVA-UIO-66” interlayer was up to 99.53 kJ/m 2 . Compared with composites reinforced by CFs modified with UIO-66 by chemically grafting or by physically absorbing without PVA, the impact toughness of CF-PVA-MOF/EP improved by 45% and 33%, respectively. This means that the highly dense weak hydrogen bonds have superiority for CFRPs toughening. Meanwhile, the interfacial shear strength (100.85 MPa) and interlaminar shear strength (102.44 MPa) of CFRPs were realized by the innovative designed interfacial structure.
研究领域:
材料科学
·
复合材料
·
机械工程
✓ 已验证
DOI
高影响因子
CARBON
·
2023
·
IF 10.9
Jie Li,Jie Sheng,Ziyue Yang,Zhaoyuan Liu,Yunzhong Wu,Changsheng Xing,Jiaxu Shuang,Bin Liu,Tong Zhang,Zhaoyu Chen,Lidong Wang,Weidong Fei
Graphene is the strongest material ever identified. However, the fabrication of graphene-based bulk materials from graphene powders presents a significant challenge. Here, a new strategy to fabricate high performance graphene based bulk materials by introducing silicon nanoparticle is proposed. Consequently, ultra-high compressive strength and high flexural strength are achieved, measuring as high as 1102 MPa and 455 MPa, respectively. The compressive strength at the microscale even reaches a remarkable 5.17 GPa. The superior strength of the bulk material is primarily attributed to the Y-type carbon structure and Si-C bonds. The Y-type carbon structures in graphene, produced by the self-propagating high-temperature synthesis (SHS) method, and the Si-C covalent bonds formed at the interface between graphene and SiC contribute to a tight linkage of graphene sheets , thereby preventing slippage of graphene sheets. In addition, the microstructure evolution process of Si-SHS-graphene bulk material is clarified. With the introduction of silicon nanoparticles, the oxidation resistance of graphene based bulk materials is substantially improved, the weight loss is around 6% after oxidized at 1000 °C. This study carries extensive implications for understanding the impact of Y-type carbon structures and the effect of Si-C bonds in graphene-based bulk materials.
研究领域:
材料科学
·
力学工程
✓ 已验证
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2024
·
IF 6.2
Chenlong Wei,Xuexiang Wang,Peng Tong,Peng Wang,Jun Wen
Due to the low bonding strength between diamond and copper, the thermal conductivity and mechanical strength of diamond/copper composites are affected. In order to improve the interface bonding strength, this paper prepared diamond/Cu composites with titanium element in two forms: adding titanium to the copper matrix and using titanium coated diamond particles, respectively. The microstructure and composition analysis of the materials were carried out through SEM, EDS, AFM, etc. The bending strength and thermal conductivity of titanium coated diamond/copper composites reached 230 MPa and 480 W/(m·K), respectively, which were higher than the bending strength and thermal conductivity of diamond/Cu composites with added titanium in the matrix (208 MPa and 127 W/(m·K) and significantly higher than the corresponding properties of pure diamond/Cu composites (69 MPa and 108 W/(m·K)). Pre coating a layer of titanium carbide on the surface of diamond can serve as a connecting bridge, effectively reducing interfacial thermal resistance and improving mechanical properties, which is more effective than adding titanium powder to the matrix to improve the bending strength and thermal conductivity of diamond/Cu composites.
研究领域:
材料科学
·
复合材料工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）