CERAMICS INTERNATIONAL
·
2026
·
IF 6
Qian Li,Zhenwei Yang,Yangyang Feng,Daxin Li,Zhaoxue Deng,Su Cheng
(SiC-BN)/BAS composite ceramics were prepared via reactive hot-press sintering at 1500 °C/10 MPa for 1 h. The effects of BN contents (0-14 wt.%) on the phase composition, density, microstructure, and mechanical properties of the composites were systematically investigated. The research showed that the incorporation of coal fly ash (CFA) and BN promoted a partial hexacelsian-to-celsian transformation. The BAS in composite ceramics primarily consists of hexacelsian and minor celsian. The celsian content reaches a maximum at 7 wt.% BN, corresponding to the peak residual compressive stress. The addition of BN leads to a gradual decrease in density and flexural strength, while fracture toughness first increases and then declines. At 7 wt.% BN, the ceramics achieve optimal comprehensive performance, with flexural strength and fracture toughness reaching 194.9 MPa and 3.74 MPa· m 1/2 , respectively. The enhancement is mainly attributed to the synergistic effects of weak interfaces introduced by BN (platelet pull-out, crack deflection, and crack bridging) and residual compressive stress induced by thermal expansion mismatch among the constituent phases.
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2014
·
IF 2.307
Yinsheng Li,Jie Yin,Haibo Wu,Hao Deng,Jian Chen,Yongjie Yan,Xuejian Liu,Zhengren Huang,Dongliang Jiang
In order to fabricate SiC–BN composites with enhanced electrical resistivity, boric acid and urea were used as reactants for synthesizing nano-sized BN particles on the surfaces of SiC powders in flowing ammonia atmosphere. The composites containing 10 wt% BN were pressureless densified at 2150 °C for 1 h with B 4 C and C as sintering additives. The chemical route was advantageous for obtaining finer BN dispersoids and microstructures of higher homogeneity, which significantly enlarged the SiC/BN interdiffusion area. Consequently, the concentrations of dissolved B and N in SiC grains became more equivalent and the carrier concentration was further decreased through impurity compensation mechanism. The chemically processed composite exhibited a considerably high electrical resistivity (1.03 × 10 12 Ω cm), which was ∼15 times higher than that of the composite prepared by conventional powder mixing method. Besides, considerably low dielectric constant (13.88) and loss tangent (0.128) at 1 MHz, as well as good thermal conductivity (70.08 W m −1 K −1 ) were also achieved.
研究领域:
材料科学
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陶瓷与复合材料
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材料电学性能
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纳米材料合成
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DOI
高影响因子
POLYMER COMPOSITES
·
2024
·
IF 4.8
Zeyu You,Ling Weng,Zijian Wu,Xiaorui Zhang,Yongliang Wang
As an emerging field of current technological development, the heat dissipation performance of electronic packaging materials has become the key to determining product reliability. Therefore, the applied thermal interface materials (TIMs) need to simultaneously meet the performance indicators of thermal conductivity, mechanics, and insulation. Although BN had excellent in-plane thermal conductivity and insulation performance, it is currently difficult to achieve vertical orientation of powder which leads the layered powder cannot complete a continuous and effective heat transfer path along the Z -axis direction inside the composite material. In order to solve the above two problems, out-of-plane thermal conductive composite was prepared by introducing magnetic oriented method. In order to comprehensively evaluate the thermal conductivity, mechanical and electrical properties, BN@Fe 3 O 4 /EP magnetic oriented composites were compared with BN@PDA-Al 2 O 3 /EP composite prepared by mechanical blending method. The vertical thermal conductivity of the magnetic oriented composite material was 2.24 W/(m·K) at 30 vol%, which was 3.39 times that of the blended composite material and 12.4 times that of pure EP. This proves that the magnetic oriented composite materials prepared by the research institute can meet the vertical heat transfer needs in the field of electronic packaging and have high research value in this area. Highlights BN@Fe 3 O 4 core–shell particles were prepared with both thermal conductivity and magnetic controllability. The thermosetting composites were prepared by heated through preliminary gel point and then cured at high temperature. The orientation of powder inside the matrix was constructed, resulted in excellent out-of-plane heat transfer performance. Comparisons were made between various properties of magnetic oriented materials and conventional blend materials. The magnetic orientation method is feasible in the field of electronic packaging.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Zhenwen Yang,Ziyi Shui,Ben Niu,Xiaoxiao Duan,Zheng Wei,Guoxia Jiang,Zhengping Hao
NH 3 decomposition is receiving increased attention for on-site CO x -free H 2 generation. Unfortunately, the harsh reaction conditions often cause sintering of active metals. Here we report a simple method to achieve well Ni dispersion by nano-structuring the BN support with La species. The surface reaction-induced LaBO 3 nano-islands on BN support have a strong affinity for Ni atoms, which can capture and confine Ni species to yield a large population of well dispersed Ni clusters and nanoparticles. The Ni species selectively anchored on LaBO 3 islands expose more active sites and boost desorption of N 2 and H 2 , exhibiting superior activity and stability for NH 3 decomposition. In addition, it is revealed that the Ni dispersion is sensitive to the change of the support surface structure. These findings highlight the important role of support structure in determining the nature of the metal phase and provide guidance for designing catalysts with controlled catalytic structure and reactivity.
研究领域:
催化化学
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材料科学
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 11
·6951-6961
·
IF 3.9
Yuangao Yan,Xuan Fei,Liuying Huang,Yuxi Yu,Yichen Wen,Gang Zhao
Hexagonal boron nitride (h-BN) with low dielectric loss and high temperature resistance opens up new opportunities for the preparation of polymer-derived SiCN ceramics (PDCs-SiCN ceramics) with excellent mechanical and dielectric properties. BN-containing polymer-derived SiCN composite ceramics (PDCs-SiCN(BN) composite ceramics) with different BN content were prepared via a pyrolysis process of ball-milling-blended Polyvinylsilazane/boron nitride (PVSZ/BN) precursors. BN is stably embedded in the SiCN tissue and tightly bound with it. The appropriate content of BN greatly improves the mechanical properties of PDCs-SiCN ceramics, as BN reduces the number of pores and prevents crack expansion. Additionally, BN is also beneficial in lowering the dielectric loss of PDCs-SiCN ceramics because of the weakened polarization relaxation behavior. PDCs-SiCN (BN) composite ceramics have optimal mechanical and dielectric properties when the BN content is 1 wt%. The flexural strength, flexural modulus and compression strength of PDCs-SiCN(BN) composite ceramics with 1 wt% BN doping content were 189.37 MPa, 46.38 GPa, and 399.02 MPa, respectively. Its average dielectric loss (tanδ ε ) at 12.4-18 GHz is 0.0049.
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
Laser & Photonics Reviews
·
2024
·
IF 9.8
Ting Gong,Yang Yang,Tongtong Xuan,Wenhao Bai,Haorui Dong,Tianliang Zhou,Rong-Jun Xie
Quantum dot (QD) color conversion films (QD-CCFs) are used in ultrahigh definition (UHD) Mini-LED backlit displays due to their narrow band emission and high color purity. However, their poor light conversion efficiency (LCE) leads to greater film thickness and thus high cost. Herein, this study proposes a local light field control strategy to enhance the LCE of QD-CCFs using high-refractive BN nanosheets. The LCEs of the green and red QD-CCFs can increase from 29.9% and 34.8% to 67.4% and 91.0% after adding BN nanosheets, respectively. Combining the experimental data with the finite-difference time domain (FDTD) simulations, the enhanced LCEs can be attributed to observably increased blue light absorption and improved light extraction efficiency of the light emitted from QDs. The white Mini-LEDs, prepared by integrating the optimized QD-CCFs containing BN nanosheets with blue Mini-LED chips, show a high luminous efficiency of 70.2 lm W −1 , a high external quantum efficiency of 36.2%, and a wide color gamut of 96.3% Rec . 2020 standards. This work provides an interesting idea for designing high-efficiency QD-CCFs toward low-cost UHD Mini-LED backlit displays.
研究领域:
光学材料
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显示技术
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 9
·6410-6421
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IF 3.5
Hao Chen,Jianjun Chen,Jiahao Yang,Zahoor Ahmad,Mingming Zhu,Yilian Xiong,Jiyu Tao,Jinxia Li
In this work, stacked SiC fibers paper-reinforced SiC ceramic matrix composites (SiC nf /SiC CMCs) were prepared by nanoimpregnation and transient eutectic (NITE) process using ultra-long single-crystal SiC nanofibers. The effect of the SiC nf surface modification via boron nitride (BN) interphase deposition as well as the sintering additive (Al 2 O 3 –Y 2 O 3 ) content on the density, microstructure, and mechanical properties of SiC nf /SiC CMCs has been investigated systematically. The results revealed that the laminated SiC nf /SiC CMCs feature a significant saw-tooth-like curve on the load–displacement test, which indicates that the obtained laminated structure with the weak interlayer binding owning to the BN coating treatment possesses significant toughening to the SiC ceramics. Specifically, the SiC nf /SiC CMCs with the sintering additive content of 12 wt% revealed a fracture toughness of over 10 MPa m 1/2 after 60 min of BN interface deposition, which is 104.31% higher than that of the composites prepared without BN coating.
研究领域:
材料科学
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力学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Jieyan Zhao,Qing Meng,Yong Li,Zengchao Yang,Jiangtao Li
Radiative cooling enables the passive cooling of buildings without energy input. Structural radiative cooling materials, such as cellulose-based composites, have recently received extensive attention due to their exceptional mechanical properties and spectral selectivity. However, the cellulose-based materials face challenges in durability and flame resistance, which limits their practical application. Herein, a structural porous Si3N4–BN ceramic with a high solar reflectivity of ∼0.95 and an atmospheric window emissivity of ∼0.95 was prepared by one-step combustion synthesis. The porous ceramic achieves a subambient radiative cooling performance of 5.14 °C under direct sunlight and theoretically yields a cooling power of 78.55 W m–2. The network structure of Si3N4 crystals leads to a flexural strength of 31.07 MPa and a compressive strength of 65.36 MPa. The porous Si3N4–BN ceramics with excellent radiative cooling performance, mechanical properties, and thermal insulation exhibit wide application prospects in building cooling, especially in the harsh environment of tropical desert and island regions.
研究领域:
材料科学
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建筑工程
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环境科学
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Song Wu,Yongfeng Xia,Ming Zhu,Jun Zhao,Dongxu Yao,Yu-Ping Zeng
Si 3 N 4 ceramics now face new applications and challenges in the semiconductor field. The preparation of h-BN/Si 3 N 4 machinable ceramics incorporating 5–30 vol% h-BN via hot-pressing was carried out. This study systematically explored how the varying h-BN content influenced the composite's microstructure, mechanical attributes, and machinability . The results showed that some of the h-BN was encapsulated by growing Si 3 N 4 grains to form an intragranular structure during the process of hot-pressing, while the remaining h-BN exhibited uniform distribution along grain boundaries. The Si 3 N 4 phase transition in composites was inhibited by excessive h-BN, accompanied by a higher decrease in densification. The sample containing 20 vol% h-BN exhibited the best comprehensive performance, with high mechanical strength and excellent machinability. The bending strength and fracture toughness remained high at 862 MPa and 10.3 MPa m 1/2 , and could be effortlessly machined with cemented carbide drills. Additionally, the machinability of the composites was systematically characterized through observations of crack propagation paths, fitting of R-curves, and mechanical drilling tests.
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
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2017
·
IF 4.075
Haoming Fang,Shu-Lin Bai,Ching Ping Wong
A series of novel flexible polymer composites consisted of boron nitride foam (BNF), boron nitride nanosheets (BNNS) and polydimethylsiloxane (PDMS) were designed and fabricated by vacuum-assisted infiltrating BNNS/PDMS mixtures into 3D BNF synthesized via chemical vapor deposition (CVD). Their microstructure, thermal, mechanical and dielectric properties were studied. Contributed to the interconnected networks of BNF and synergistic effect of BNNS with BNF, 10 wt% BNNS/BNF/PDMS composite shows a high thermal conductivity of 0.56 W m −1 K −1 , high heat resistance index of 275.6 °C, 33% increment of Young’s modulus compared to PDMS, relative permittivity of 3, dissipation factor of 0.0051, EMI shielding effectiveness of 1.5 dB at X band and breakdown strength of 21.8 MV/m. Due to the outstanding comprehensive properties, BNNS/BNF/PDMS composites have a promising potential application in wide electronic packaging field.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
Applied Materials Today
·
2026
·
IF 7
Xian Wu,Xiu Wang,Yiwen Chen,Yifei Qu,Hao Zhang,Tingting Xu,Huiyang Bian,Guigan Fang,Hongqi Dai,Chen Su
Pore structures and interface issues have long impeded significant improvements in the thermal conductivity of biphasic composites. This work introduced a calendering technique, adapted from the traditional papermaking industry, to address these challenges in hexagonal boron nitride/tempo-oxidized cellulose nano-fiber (h-BN/TOCNF) composites. Calendering effectively reduced porosity, enhanced compactness, and improved the interface between the two phases. The results indicated that without calendering, the thermal conductivity of the composites increased with higher h-BN loading. At 50 wt% h-BN content, the through-plane thermal conductivity reached 0.82 W/m·K, which was 116% higher than that of a pure TOCNF film (0.38 W/mK). Contrary to expectations, higher calendering pressure did not yield better performance. The optimal balance was achieved with the composites containing 30 wt% h-BN processed at 2 MPa (h-BN30/TOCNF-2 composites), achieving a high thermal conductivity of 0.71 W/m·K coupled with the highest mechanical strength (40.21 MPa). This synergistic enhancement was attributed to the molecular slippage of TOCNF and preferential orientation of h-BN induced by appropriate calendering pressure, leading to tighter bonding and the formation of a “brick-mortar-brick” structure conductive to phonon transfer and mechanical reinforcement. This work demonstrates that calendering, a simple and scalable post-processing technique, can effectively engineer the microstructure of biphasic composites, leading to simultaneous enhancement in thermal and mechanical properties.
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Ningning Dong,Bangjun Li,Yue He,Liuxin Chao,Yun Zhu,Lu Liu,Jiongjie Liu,Guobing Ying
This work demonstrates a strategic approach to enhance the thermomechanical performance of Si 3 N 4 /BN composites through interface optimization and control of powder particles. By adding the MgO sintering additive at BN interfaces coupled with 0.5 μm Si 3 N 4 fiber precursor, we achieved full densification with mechanical properties, attaining a density of 3.19 g·cm −3 , the remarkable flexural strength of 627.36 MPa, and fracture toughness of 13.48 MPa·m 1/2 . The composites exhibit exceptional thermal shock resistance, retaining 586.19 MPa (93.44 % retention) after 1000 ℃ thermal shocking, facilitated by in situ formation of a continuous SiO 2 glass barrier that effectively prevents oxidation. Intriguingly, the residual strength shows a trend of first decreasing and then increasing with the increase of Δ T . At Δ T = 1500 ℃, the composite maintains the residual strength of 469.46 MPa (74.83 % retention), outperforming conventional monolithic ceramics through a self-healing mechanism enabled by viscous flow of the glass phase. Microstructural evolution analysis coupled with fracture morphology establishes direct correlations between the interface, mechanical properties, and thermal-shock resistance. These findings provide fundamental insights into designing composites with excellent thermal-shock resistance for ultrahigh-temperature structural applications.
研究领域:
材料科学
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陶瓷
·
复合材料
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热力学分析
·
界面工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）