JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Tao Feng,Wanbo Hou,Mingde Tong,Hejun Li,Hongjiao Lin,Shifeng Wen
SiC nanowires (SiC nws ) modified SiC f /HfC-SiC composites were prepared by precursor infiltration and pyrolysis (PIP) and chemical vapor infiltration (CVI) methods. The microstructure, flexural strengths, impact and impact-ablation tests of the composites with and without SiC nws were investigated. The results showed that after introducing SiC nws , not only the retention rate of HfC ceramic produced by PIP was increased obviously, but also the fracture displacement of the modified composites was reduced due to the enhancement effect of SiC nws at interface between SiC fiber and matrix. After impact and impact-ablation, the strength retention of SiC nws modified composites was 91.6 % and 69.1 % respectively, higher than that of the composites without SiC nws (85.2 % and 54.8 %). As the impact resistance of the modified composites was improved by the pull-out and bridging of SiC nws , the ablation resistance of the impacted composites was enhanced as well.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yi Hou,Jixiang Wang,Baijun Chen,Hui Zhang,Zichen Xiang,Haikui Zhu,Lixi Wang
To meet the requirements of lightweight and wideband attenuation for advanced electromagnetic (EM) absorption materials, the combination of both MOF composition and hierarchical structural design was applied as the strategy to prepare the MOF-derived Co@SiC nanowire (Co@SiCnw) nanocomposite aerogel. The hierarchical and laminated structures with multiple Co@SiCnw layers were constructed via a mixed growth-assisted freeze-drying and calcination process. The ultralightweight Co@SiCnw presents a low density of 0.11 g/cm3. With abundant second-phase polarization interfaces and enlarged EM wave attenuation channels to enhance dielectric and conductive loss, the optimized Co@SiCnw offers a minimal reflection loss (RLmin) of −61.4 dB at 10.0 GHz (2.64 mm) and an effective absorption bandwidth (EAB) as wide as 7.44 GHz with a sample thickness of only 2.16 mm. Furthermore, multifunctionalities, including low density, thermal insulation, and self-standing, were demonstrated for Co@SiCnw, making it a high-performance and practical microwave absorption material.
研究领域:
材料科学
·
电磁学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·
IF 1.8
Meihan Ren,Xiao You,Mengli Xiao,Han Luo,Yudong Xue,Chunjing Liao,Haijun Zhou,Jinshan Yang,Xiangyu Zhang,Shaoming Dong
The reliable jointing of SiC f /SiC is considered to be a key factor limiting the application in the field of nuclear cladding. In this work, a jointing layer with interconnected SiC nanowires (SiCNWs) toughening network is prepared by a typical two-step routine. The high-viscosity slurry containing the precursor is pyrolyzed to form a porous SiC-based jointing layer, which is then densified by chemical vapor infiltration. Besides, SiC powders are introduced into the slurry to further increase the density of the jointing layer. The homogeneous SiC jointing material enables the strength and effectively avoids the mismatch between the thermal expansion coefficient of the jointing layer and SiC f /SiC composites, and the apparent shear strength of the jointing specimen reaches 7.211 MPa. It is found that the joint with SiCNWs shows better shear strength than the joint without SiCNWs, and the improved mechanical properties could be attributed to the pull-out and bridging of SiCNWs.
研究领域:
材料科学
·
核工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Shanliang Chen,Minghui Shang,Lin Wang,Zuobao Yang,Fengmei Gao,Jinju Zheng,Weiyou Yang
Low turn-on fields together with boosted stabilities are recognized as two key factors for pushing forward the implementations of the field emitters in electronic units. In current work, we explored superior flexible field emitters based on single-crystalline 3C-SiC nanowires, which had numbers of sharp edges, as well as corners surrounding the wire body and B dopants. The as-constructed field emitters behaved exceptional field emission (FE) behaviors with ultralow turn-on fields (Eto) of 0.94–0.68 V/μm and current emission fluctuations of ±1.0–3.4%, when subjected to harsh working conditions under different bending cycles, various bending configurations, as well as elevated temperature environments. The sharp edges together with the edges were able to significantly increase the electron emission sites, and the incorporated B dopants could bring a more localized state close to the Fermi level, which rendered the SiC nanowire emitters with low Eto, large field enhancement factor as well as robust current emission stabilities. Current B-doped SiC nanowires could meet all essential requirements for an ideal flexible emitters, which exhibit their promising prospect to be applied in flexible electronic units.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBON
·
2017
·
IF 6.337
Shanshan Xiao,Hui Mei,Daoyang Han,Konstantinos G. Dassios,Laifei Cheng
Three-dimensional hybrid foams of SiC nanowires (SiC NWs) coated and bonded with nanostructured lamellar carbon films are, herein synthesized for the first time, by combination of unidirectional freeze drying and carbonization techniques. The crystallinity of the carbon films was tunable from amorphous carbon to graphene-like carbon by heat treatment of the as-received hybrid foams to different temperatures within the range of 600–1500 °C. The SiC NWs-nanostructured lamellar carbon (SiC NWs/C) hybrid foams exhibited electromagnetic (EM) wave absorbing properties highly superior to current state-of-the-art counterparts, at filler loadings as low as 9.2 mg/cm 3 . Effective absorption bandwidth of the SiC NWs/C foam was observed to cover the whole X-band frequency range of 8.2–12.4 GHz, with reflection loss values reaching −31 dB for an optimum thickness of 3.3 mm. The absorption efficiency of the SiC NW/C hybrid foams is discussed in the text in view of the highly absorbing layered morphology of the developed material, of interfacial polarization and multiple reflections effects and of polarization relaxation effects.
研究领域:
材料科学
·
电磁学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2017
·
IF 3.454
Y.L. Zhuang,T.S. Lin,S.J. Wang,P. He,D.P. Sekulic,D.C. Jia
The Ti 22 Si 78 (wt.%) braze was used to bond porous BN/Si 3 N 4 ceramic. The results revealed that the joint strength was low. In order to improve the joint strength, a carbon coated modification of the porous BN/Si 3 N 4 substrate, achieved by the pyrolysis of phenol-formaldehyde resin was suggested. The thickness of carbon layer was controlled by the volume ratio of phenol-formaldehyde resin and methyl alcohol (R/M). The effect of the carbon layer on the microstructure and mechanical properties of the joint was examined. It was established that the maximum joint strength was achieved at the level of 80 MPa (as opposed to the uncoated joint with only 30 MPa) when R/M was 1:2, at the given brazing temperature. The improvement of the joint strength is attributed mainly to the formation of a SiC infiltration reaction layer, a significant population of SiC nanowires, as well as TiN 0.7 C 0.3 and TiB 2 particles.
研究领域:
材料科学
·
工程学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Pengfei Wu,Yu Liu,Shenwei Xu,Zeyu Fu,Aimin Pang,Wei Li,Haitang Yang
The effects of the SiC nanowires (SiCNWs) and PyC interface layers on the mechanical and anti-oxidation properties of SiC fiber (SiC f )/SiC composites were investigated. To achieve this, the PyC layer was coated on the SiC f using a chemical vapour infiltration (CVI) method. Then, SiCNWs were successfully coated on the surface of SiC f /PyC using the electrophoretic deposition method . Finally, a thin PyC layer was coated on the surface of SiC f /PyC/SiCNWs. Three mini-composites, SiC f /PyC/SiC, SiC f /PyC/SiCNWs/SiC, and SiC f /PyC/SiCNWs/PyC/SiC, were fabricated using the typical precursor infiltration and pyrolysis method. The morphologies of the samples were examined using scanning electron microscopy and energy dispersive X-ray spectrometry. Tensile and single-fibre push-out tests were carried out to investigate the mechanical performance and interfacial shear strength of the composites before and after oxidization at 1200 °C. The results revealed that the SiC f /PyC/SiCNWs/SiC composites showed the best mechanical and anti-oxidation performance among all the composites investigated. The strengthening and toughening is mainly achieved by SiCNWs optimization of the interfacial bonding strength of the composite and its own nano-toughening. On the basis of the results, the effects of SiCNWs on the oxidation process and retardation mechanism of the SiC f /SiC mini-composites were investigated.
研究领域:
材料科学
·
力学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Peisen Liu,Xukun Yang,Liwen Yan,Anran Guo,Jiachen Liu
Achieving high-temperature-resistant and high-strength connections of silicon carbide ceramics in an oxidizing atmosphere without pressure is an urgent challenge. A composite adhesive was innovatively designed using the polysiloxane as matrix and B 4 C, nano-silicon and LSAM glass-ceramics as fillers. The introduction of LSAM glass-ceramics enabled an excellent matching of the thermal expansion between the adhesive and the SiC. A strong interfacial bonding was formed at the bonded interface due to the dissolution-diffusion of Mg 2+ , Li + , [SiO 4 ] and [AlO 4 ]. Moreover, the SiC nanowires grown in-situ inside the adhesive effectively repaired the defects caused by the pyrolysis of adhesive matrix, substantially enhancing the high-temperature mechanical properties of the SiC joints. After the heat treatment at 1400 °C, the SiC joints bonded using the adhesive showed a room temperature shear strength of 97.2 MPa and a high temperature shear strength of 81.6 MPa at 1300 °C, providing a significant advantage over existing works.
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
Materials Today Communications
·
2024
·
IF 3.7
Hao Chen,Jianjun Chen,Yongwei Lou,Mingming Zhu,Jinxia Li,Jiahao Yang,Hussain Zaheer
SiC nanowire paper composed of SiC nanowires, possesses extensive industrial applications owing to its remarkable properties of low thermal conductivity , fire resistance and foldability. In this work, centimeter-scale SiC nanowires were successfully synthesized via a sol-gel and carbothermal reduction reaction. Subsequently, the simple and convenient traditional handcraft paper-making process enables the non-oriented intertwining of nanowires, forming a paper-like structure. Experimental results show that the thermal conductivity of silicon carbide nanowire paper with a thickness of 0.7 mm is 0.041 W/m∙K at room temperature, which is far lower than that of the traditional porous ceramics because of its nanoporous structure. Moreover, upon heating the nanowire paper to 300 °C, a significant temperature difference of approximately 150 °C was observed between its front and back surfaces, and it was able to withstand the butane flame (∼1300 °C) heat treatment for a long time, which indicated that the nanowire paper had obvious low thermal conductivity, good thermal insulation and refractory properties. These characteristics ensure the promising application of SiC nanowire paper for thermal insulation and fire resistance applications.
研究领域:
材料科学
·
热物理学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Xinliang Li,Xiaowei Yin,Hailong Xu,Meikang Han,Minghang Li,Shuang Liang,Laifei Cheng,Litong Zhang
Two-dimensional (2D) few-layered Ti3C2TX MXene (f-Ti3C2TX) has been proved to be one of the most promising electromagnetic interference (EMI) materials, but its electromagnetic (EM) absorption properties and loss mechanism have not been studied so far. Herein, for the first time, ordered lamellar f-Ti3C2TX/SiCnws hybrid foams with ultralow density are synthesized by a combination of self-assembly and bidirectional freezing processes. The freestanding foams exhibit excellent EM absorption properties superior to most of the current foam-based counterparts. The effective absorption bandwidth is always able to cover the whole X-band, when the sample thicknesses of f-Ti3C2TX/SiCnws hybrid foams distribute in any value between 3.5 and 3.8 mm, and the minimum reflection coefficient reaches −55.7 dB at an ultralow density of only about 0.029 g·cm–3. The fundamental mechanism associated with optimized impedance matching, enhanced polarization loss, and conductive loss is discussed in detail. Our results evidence that 2D flexible f-Ti3C2TX MXene has great potential in EM absorption field like graphene.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBON
·
2023
·
IF 10.9
Linyi Wu,Yipei Li,Binghua Zhou,Jian Liu,Deliang Cheng,Shien Guo,Keng Xu,Cailei Yuan,Mingxi Wang,Gan Jet Hong Melvin,Josue Ortiz-Medina,Sajjad Ali,Teng Yang,Yoong Ahm Kim,Zhipeng Wang
Coupling graphene-based materials with SiC nanostructures is one of the most feasible strategies to improve the photocatalytic CO 2 reduction performance. Here, we synthesized the vertical graphene (VG) sheets on the SiC nanowires achieved from rice husks to form the VG@SiC/C composite, in which the VG sheets possess high surface area, excellent electrical conductivity , and chemical stability, and the SiC nanowires have a suitable bandgap for sunlight absorption. The resulting VG@SiC/C composite provides an enhanced photocatalytic reduction of CO 2 to CO and CH 4 , yielding CO and CH 4 evolution yields of 25.5 and 2.3 μmol g −1 h −1 , respectively. The achieved CO yield is maximal so far among the SiC-based photocatalysts . The defective VG sheets promote the absorption of sunlight, enhance the CO 2 adsorption and activation, increase the separation of photogenerated electron-hole pairs, improve the activity of photocatalyst, and thereby prompt the photocatalytic reduction of CO 2 to CO with high yield and selectivity.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 4
·1281-1291
·
IF 5.693
Du Bin,Zhang Dongyang,Qian Junjie,Cai Mei,He Chao,Zhou Peng,Shui Anze
Obtaining multifunctional materials with desired properties for astronautics is a challenge. In this work, carbon nanofiber (CNF) and SiC-CNF aerogel films are fabricated using bacterial cellulose as scaffolds, which offer industrial-scale production and excellent mechanical strength and stability. The produced aerogel films demonstrate excellent microwave absorption and low thermal conductivity properties. Further, the microwave absorption properties of the aerogels were significantly enhanced due to the proper impedance matching and interface polarizations following the in situ growth of SiC nanowires. In consequence, SiC-CNF aerogel films show enhanced electromagnetic wave absorption, including the minimum reflection loss of −53.3 dB and low thermal conductivity of 0.046 W/m·K at 200 °C. Our work can provide new insight into the fabrication of multifunctional ceramic aerogels for critical applications. Graphical abstract The SiC nanowire-carbon nanofiber (SiC-CNFs) aerogels were fabricated, and the as-obtained samples possessed excellent microwave absorption and thermal insulation properties.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）