JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
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IF 4.495
Qianglong He,Shi Tian,Jingjing Xie,Cuili Xiang,Hao Wang,Weimin Wang,Zhengyi Fu
B 6.5 C-TiB 2 -SiC-BN composite ceramics were prepared by a novel solid-state reaction using TiCN, B, and Si as raw materials. The final products obtained by hot pressing at 1950 °C possessed a fine microstructure, homogeneous distribution, and excellent mechanical properties . The obtained bulk B 6.5 C-TiB 2 -SiC-BN composite ceramic shows a high relative density (98.8 %). The mechanical properties of the composites are anisotropic because of the orientation growth and structural characteristics of TiB 2 and h-BN grains. The values of hardness, bending strength , and fracture toughness measured along the hot-pressing direction were 19.6 GPa, 801 MPa, and 4.30 MPa m 1/2 , respectively, which were higher than those measured perpendicular to the hot-pressing direction. The formation of twin structures in B 6.5 C and SiC grains and the crack deflections induced by h-BN and TiB 2 grains are beneficial for improving the mechanical properties of these composites.
研究领域:
材料科学
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机械工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zahoor Ahmad,Jianjun Chen,Hao Chen,Hafsa,Muhammad Arfan,Tauseef Shahid,Xiaohong Li,Zaheer Hussain
In this work, we studied the effects of protective boron nitride/silconaluminocarbide (BN/SiAlC) interphases on the structural and mechanical properties of fabricated stacked carbon fiber-reinforced SiC ceramic matrix composites (C f /SiC CMCs) via the hot-press sintering route. The structural analyses were carried out by X-ray diffraction and scanning electron microscopy (SEM), while mechanical properties were elucidated by employing universal testing machine. The observed sharp diffraction peaks indicate excellent crystallization, and the formation of 4 H -SiC polytype was attributed to the partial transition of β -SiC phase during high-temperature sintering. The composite with single BN interface layer revealed enhanced bending strength of up to 364 ± 39.46 MPa (↑40 %), while composite with double layered interface showed optimal strength of 436 ± 33.54 MPa, and toughness of 6.11 ± 0.74 MPa m 1/2 , with increments of 67.7 % and 128.8 %, respectively, compared to the composite without interphase layer. In the composite with duplex interfacial layer (3BN/SiAlC), the microcracks generated during fracture propagated into the BN layer, deflected through both the sublayers and at the fiber-BN interface, resulting in fiber pull out using fracture energy, leading to the enhanced strength and toughness of the composite. The load-displacement curve revealed that the stacking C f /SiC CMCs with weak interlayer binding owing to the BN/SiAlC coating treatment possesses significant toughness to the SiC ceramics.
研究领域:
材料科学
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机械工程
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DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Miao Wang,Yijin He,Xiaoyu Yang,Xuhui Hou,Wenxuan Li,Shaobo Tan,Zhicheng Zhang
With the increasing demand for dielectric materials in high-frequency microwave applications, fluoropolymer-based dielectric materials have been widely utilized due to their excellent dielectric and insulation properties. However, the low thermal conductivity limits their ability to meet the thermal dissipation requirements during high-frequency and high-speed signal transmission. The present study introduces a pioneering interface engineering strategy wherein C–F bonds on the surface of ethylene-tetrafluoroethylene copolymer (ETFE) are photo-catalytically activated, enabling successful grafting of poly(glycidyl methacrylate) (PGMA) chain segments. Subsequently, the resulting graft copolymers are blended with thermally conductive h-BN filler to prepare composite dielectric materials. The results demonstrate that the incorporation of PGMA segments significantly enhances the interfacial compatibility between the ETFE matrix and h-BN filler, resulting in composites with a dense microstructure and outstanding dielectric and thermal properties. At a filler content of 30 vol%, the ETFE-g-PGMA@BN composite achieves an in-plane thermal conductivity of 4.2 W (m K)−1 and a through-plane thermal conductivity of 0.77 W (m K)−1. Moreover, at 1 GHz, the composite exhibits a dielectric constant of 2.2 and a dielectric loss of 0.004. This work presents a novel interface design strategy for surface modification of PTFE-based fluoropolymers, expanding their potential applications in printed circuit boards (PCBs) and providing a new direction for the design of polymer-based dielectric materials.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2023
·Vol. 58
·期 7
·3025-3037
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IF 4.5
Zhang Kai,Sun Yinjie,Hou Sifan,Li Guoqi,Fan Jinpeng
Multi-scale BN/SiC ceramic with high toughness was successfully prepared by vacuum-assisted filtration. The BN/SiC ceramic bulk is composed of macroscopic laminated structure and microscopic brick–mortar structures in layer. In this ceramic, improving toughness relies on the design of multi-scale structure. The ordered arrangement of BN sheets and SiC form a ceramic layer with a structure similar to brick and mortar. At the same time, the SiC layer and BN/SiC layer are alternately arranged by layer-by-layer deposition method to form the macro-layer structure. The thickness of SiC layer and BN/SiC layer is only about 74 μm and 7.6 μm, respectively. The mode of crack propagation changed with the change in the structure and variation of BN content in the BN/SiC layer. The delamination cracks occurred inside the BN/SiC layer or at the interface between SiC and BN/SiC layers. The BN/SiC laminated ceramic possesses high toughness (9.37 MPa m 1/2 ) when the BN content is 20wt.%, which is much higher than that of pure SiC bulk (3.45 MPa·m 1/2 ).
研究领域:
材料科学
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陶瓷工程
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2022
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IF 6.364
Bin Xu,Huiyong Yang,Ruiying Luo,Lianyi Wang,Juntong Huang,Dian Chen
The feasibility of fabricating a BN matrix/fiber interphase of SiC/SiC composites via electrophoresis deposition (EPD) was investigated based on the simplicity and non-destructiveness of the process and the excellent interfacial modification effects of BN. The BN suspension and SiC fiber surface properties were both adjusted to generate suitable conditions for the EPD process of the BN interphase. Next, the deposition dynamics and mechanism were studied under different deposition voltages and time, and the relationship between the deposition morphology of the BN interphase and mechanical properties of the fabricated mini SiC/SiC composites were also discussed. After oxidation at high temperature (600–1000 ℃), the mechanical properties of the mini SiC/SiC composites were studied to verify the oxidation resistance effect of the EPD-deposited BN interphase, whose oxidation resistance mechanism was briefly analyzed as well.
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
COMPOSITES SCIENCE AND TECHNOLOGY
·
2020
·
IF 7.094
Hairui Bai,Guanglong Ge,Xia He,Bo Shen,Jiwei Zhai,Hui Pan
Novel surface insulated 0.5(Ba 0.7 Ca 0.3 )TiO 3 -0.5Ba(Zr 0.2 Ti 0.8 )O 3 (BCZT) nanofibers adhered with boron nitride nanosheets (BNNSs), named as BCZT@BN, is used as fillers in polyvinylidene fluoride (PVDF)-based nanocomposites . Double layered film which comprises high breakdown strength ( E b ) layer of PVDF/0.8 wt% BNNSs (PBN 0.8 ) and high dielectric constant ( ε r ) layer of PVDF/0.4 wt% BNNSs/ z wt% BCZT@BN (PBN 0.4 BCZT@BN z ) is employed. The E b is largely increased from 380 MV m −1 of pristine PVDF film to 730 MV m −1 of PVDF nanocomposite fed with 0.8 wt% BNNSs, and a high discharge energy density ( U dis ) of 17.9 J cm −3 is achieved at the same time. Furthermore, after introducing 1.6 wt% BCZT@BN in PBN 0.8 -PBN 0.4 BCZT@BN 1.6 nanocomposites, the ε r reaches up to 10.7, which is substantially improved by 119% over that of PBN 0.8 nanocomposite (9.1). Thus, the incorporation of BCZT@BN NFs endows the PBN 0.8 -PBN 0.4 BCZT@BN 1.6 nanocomposite with an impressive energy storage density ( U e ) of 24.3 J cm −3 , which is 3.57 times of pristine PVDF. Finite element simulation analysis reveals that BNNSs adhered on the surface of BCZT NFs exhibit a prominent effect in local electric field elimination and leakage current density dispersion. The strategy provides an innovative approach to enhance the energy storage performance of polymer-based nanocomposites.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Ziqian Ding,Xiaolin Qiu,Huaxuan Liu,Lingli Gu
Functional form-stable phase change materials (FPCMs) offer great promise for thermal management in transport packaging due to their stability after phase change cycle and the extension of service life. However, challenges remain in enhancing thermal conductivity and energy storage efficiencies. In this study, a magnetically aligned h-BN-embedded superporous carbon foam-based FPCM containing paraffin (M-BN-CPCMs) was fabricated via a foam polymerization method followed by high-temperature carbonization. A super-porous hydrogel (SPH) precursor was used to construct a robust, highly porous carbon skeleton to accommodate more PCMs. To further enhance thermal conductivity, h-BN was functionalized with Fe 3 O 4 nanoparticles, and the resulting BN-Fe 3 O 4 was magnetically oriented within the carbon skeleton using a synchronous magnetization process. This novel design achieved a thermal conductivity improvement of over 90% compared to SPH. Additionally, the synergistic photothermal conversion effect achieved by the magnetic nanoparticles and carbon skeleton resulted in an outstanding photothermal conversion efficiency of approximately 90% for M-BN-CPCMs. Notably, the incorporation of BN-Fe 3 O 4 increased pore sizes, enabling higher paraffin loading capacity. The M-BN-CPCMs with large holes exhibit a remarkable phase change enthalpy of 154.9 J/g, demonstrating excellent energy storage capability, which surpasses that of superporous carbon foam skeleton-based FPCMs (CPCMs). The optimized M-BN-CPCMs demonstrated superior thermal energy storage, faster thermal charging rates, and improved thermal regulation, effectively reducing temperature fluctuations within insulated packaging. These findings underscore the potential of M-BN-CPCMs as a groundbreaking solution for energy storage and thermal management in transport packaging, addressing critical challenges in the field.
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
·
IF 9.7
Menghan Sun,Lishan Wei,Jinsong Peng,Gongyuan Zhao,Dengfeng Yu,Chunxia Chen
Aqueous Zn–I 2 batteries have garnered significant attention due to their high abundance and safety. However, the sluggish iodine redox kinetics and undesirable shuttle effect severely hindered their wider application. Herein, dual doping of B and N provides an effective strategy to modulates chemical properties and electron distributions of carbon hosts, resulting in high performance of Zn–I 2 batteries. The local electron redistribution enhances electron density at the Fermi level of the carbon host, thereby improving intrinsic conductivity. Additionally, combining experiments and DFT calculations reveal that N B center sites are benefited in suppressing shuttle effects, strengthened interactions with iodide species, and facilitated catalytic conversion kinetics. Notably, Zn–I 2 batteries fabricated with B and N co-doped porous carbon (BNAC) achieve an outstanding capacity (231.7 mAh g −1 at 0.1 A g −1 ) and excellent cycling stability (capacitance retention of 98 % after 4,500 cycles). This study not only provides valuable insights into the design of advanced carbon materials but also clarifies the active sites in B/N co-doped carbon materials, offering guidance for the rational design of carbon-based electrode materials for Zn–I 2 batteries.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL POLLUTION
·
2022
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IF 9.988
Jijie Kong,Xiaoyu Cao,Wen Huang,Chao Li,Qiming Xian,Shaogui Yang,Shiyin Li,Cheng Sun,Huan He
The occurrence of nitrated polycyclic aromatic hydrocarbons (NPAHs) in sediments has been widely reported, but research on NPAH bioavailability is lacking. In this study, a self-made zeolite imidazolate framework-8/hexagonal boron nitride (ZIF-8/h-BN) solid-phase microextraction (SPME) fiber and commercial Tenax are compared as efficient tools to predict the bioavailability of NPAHs in sediments with bioassays using Cipangopaludina chinensis . During the process of SPME, the NPAH concentrations on the ZIF-8/h-BN fibers reached extraction equilibrium after 72 h. The fiber extraction of NPAHs in sediments was well-fitted by the pseudo first-order kinetic model with a rate constant of 2 × 10 −2 h −1 (R 2 > 0.98). The extraction rates ranking of NPAHs in sediments was 2-nitrobiphenyl>1-nitropyrene>5-nitroacenaphthene>2-nitrofluorene. Compared with SPME, NPAH concentrations reached equilibrium after 168 h for the Tenax extraction. The orders of magnitude of fast, slow, and very slow desorption rate constants were 10 −1 , 10 −2 , and 10 −4 , respectively. At extraction equilibrium (168 h), the SPME was close to the bioavailability of the NPAHs in sediments to Cipangopaludina chinensis with a slope statistically approximated to one. In addition, the linear regression for SPME (R 2 = 0.7285) was slightly higher than that of the Tenax extraction (R 2 = 0.7168) over a short time (6 h). This could be because the coating material of ZIF-8/h-BN can rapidly adsorb freely dissolved NPAHs, and the SPME fibers can accurately predict the bioaccumulated concentrations of NPAHs in exposed organisms by measuring the concentration of NPAHs in the pore water of sediment. This study provides a time-saving and easy procedure to predict the bioavailability of NPAHs in sediments.
研究领域:
环境科学
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毒理学
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产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 5
·401
·
IF 4.3
Xiaoxiao Peng,Haiyan Jing,Lan Yu,Zongdeng Wu,Can Su,Ziyu Ji,Junjie Shu,Hua Tang,Mingzhu Xia,Xifeng Xia,Wu Lei,Qingli Hao
To significantly improve the tribological performance of epoxy resin (EP), a novel h-BN/MoS2composite was successfully synthesized using spherical MoS2particles with lamellar self-assembly generated through the calcination method, followed by utilizing the “bridging effect” of a silane coupling agent to achieve a uniform and vertically oriented decoration of hexagonal boron nitride (h-BN) nanosheets on the MoS2surface. The chemical composition and microstructure of the h-BN/MoS2composite were systematically investigated. Furthermore, the enhancement effect of composites with various contents on the frictional properties of epoxy coatings was studied, and the mechanism was elucidated. The results demonstrate that the uniform decoration of h-BN enhances the chemical stability of MoS2in friction tests, and the MoS2prevents oxidation and maintains its self-lubricating properties. Consequently, due to the protective effect of h-BN and the synergistic interaction between h-BN and MoS2, the 5 wt % h-BN/MoS2composite exhibited the best friction and wear resistance when incorporated into EP. Compared to pure EP coatings, its average friction coefficient and specific wear rate (0.026 and 1.5 × 10−6mm3N−1m−1, respectively) were significantly reduced. Specifically, the average friction coefficient decreased by 88% and the specific wear rate decreased by 99%, highlighting the superior performance of the h-BN/MoS2-enhanced epoxy composite coating.
研究领域:
材料科学
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摩擦学
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表面工程
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DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Mao Chen,Bingbing Fan,Haoyuan Lei,Zijie Song,Shaojun Zhang,Hailong Wang,Rui Zhang,Hongxia Li,Yongqiang Chen
Large size high density h-BN/ZrO 2 composites (ø = 110 mm, h = 15 mm) were rapidly prepared by spark plasma sintering (SPS) with sintering cycle 20 min. The effects of additives on the mechanical properties , microstructure evolution, and corrosion resistance of the h-BN/ZrO 2 composites were studied. The Al 2 O 3 , MgO , SiO 2 , La 2 O 3 and ZrO 2 rapidly formed heterogeneous eutectic crystals under the action of SPS. The low eutectic compounds significantly promoted the diffusion of h-BN or ZrO 2 , also increased the density. The flexural strength of h-BN/ZrO 2 composites could reach 196.31 MPa, and the apparent porosity was only 0.42 %. The additives are combined with zirconia to form a high viscosity eutectic, whose corrosion resistance to molten steel is obviously better than that of single ZrO 2 . The corrosion depth of h-BN/ZrO 2 composites was only 114 µm after corroded in molten steel at 1550 °C for 80 min. The comprehensive properties of h-BN/ZrO 2 composites were obviously improved by appropriate additives.
研究领域:
材料科学
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陶瓷工程
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
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IF 6.182
Qiang Liu,Zhuo Li,Qiuwen Liu,Chuchu Cheng,Mingxia Song,Caijin Huang
The Co@BN core–shell nanostructure of Co core and boron nitride (BN) shell was prepared through a facile one-step thermal treatment. The as-prepared Co@BN nanocomposites exhibited excellent dye-sensitized photocatalytic hydrogen evolution activity (13.78 mmol h −1 g −1 ) with visible light and the apparent quantum yield was 1.15%. The enhanced adsorption of EY on the BN shell and the Co/BN Schottky junction facilitate the tandem transfer of photo-generated carriers to the Co surface. Moreover, the core–shell interface serves as a nanoreactor boosting the reduction of H + to H 2 on the Co surface. Additionally, the magnetic recyclability makes Co@BN favorable for its practical application. This work extends the application of the “photocatalysis under shell” and has potential in dye-sensitized solar cell.
研究领域:
材料科学
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纳米技术
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光化学
·
能量转换
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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）