JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 9
·6410-6421
·
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
·
力学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Jiahao Yang,Ruiqi Ma,Mingming Zhu,Yilian Xiong,Jiahui Shi,Xiaohong Li,Haolin Li,Jianjun Chen
This study reports on the preparation and mechanical properties of a novel SiC nf /SiC composite. The single crystal SiC nanofiber(SiC nf ) reinforced SiC ceramic matrix composites (CMC) were successfully fabricated by hot pressing the mixture of β -SiC powders, SiC nf and Al–B–C powder. The effects of SiC nf mass fraction as well as the hot-pressing temperature on the microstructure and mechanical properties of SiC nf /SiC CMC were systematically investigated. The results demonstrated that the 15 wt% SiC nf /SiC CMC obtained by hot pressing (HP) at 1850 °C with 30 MPa for 60 min possessed the maximum flexural strength and fracture toughness of 678.2 MPa and 8.33 MPa m 1/2 , respectively. The nanofibers pull out, nanofibers bridging and cracks deflection were found by scanning electron microscopy, which are believed can strengthen and toughen the SiC nf /SiC CMC via consuming plenty of the fracture energy. Besides, although the relative density of the prepared SiC nf /SiC CMC further increased with the sintering temperature rose to 1900 °C, the further coarsend composites grains results in the deterioration of the mechanical properties for the obtained composites compared to 1850 °C.
研究领域:
材料科学
·
工程学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Jinxia Li,Jianjun Chen,Jiyu Tao,Hao Chen
The cotton fiber batt is one of the most commonly used thermal insulator in our lives at room temperature because of its flexible and porous structure . The SiC nanofibers have excellent mechanical, physical, and chemical properties such as high mechanical strength and modulus, low density, high-temperature resistance, which is a promising material for high temperature structural materials or thermal insulator. In this work, a flexible SiC nanofiber batt was fabricated from the cotton fiber batt by sol-gel carbothermal reduction reaction. The fluffy carbonized porous cotton batt was used as a template for the fabrication of sponge-liked SiC nanofiber batt composed of single crystalline β-SiC fibers. It exhibits good compressive flexibility, ultra-high porosity (a specific surface area was 30.90 m²/g), excellent high-temperature stability (ranging from −196 °C in liquid nitrogen to 1300 °C under the flame of butane blowtorch) and low thermal conductivity (0.02 W/(m·K) at room temperature). The SiC nanofiber batt, which has low density, excellent high-temperature resistance and oxidation resistance , is a promising material for high-temperature structural materials or thermal insulators under extreme conditions. The facile fabrication method of SiC nanofiber batt from common cotton batt provides a novel technique for economic industrial production of high temperature thermal insulation material .
研究领域:
材料科学
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2024
·
IF 6.5
Xiu-Zhi Tang,Ziwen Zhao,Zijian Liao,Jianling Yue,Weiping Gong,He Zhang,Yi Wang
The incorporation of magnetic ingredients is critical for ceramic-based microwave absorbers with high efficiency. However, this task is becoming challenging due to the dispersion and oxidation issues. In this study, metal-organic framework (MOF) ZIF-67 was employed as the precursor of magnetic compounds and combined with a polymer solution to fabricate SiC textiles using the electrospinning technique. The microstructure analysis confirmed the successful introduction of MOF particles within the SiC nanofibers. Further examination of chemical compositions and magnetic properties revealed the encapsulation of magnetic compounds in hybrid SiC textiles. Since the applied fabrication approach ensures a superior dispersion and protection of metal compounds in a ceramic matrix, the microwave absorption of SiC fabric with both dielectric loss and magnetic loss exhibits a high reflection loss of −59.4 dB and a wide effective absorption band of 5.70 GHz. The current fabrication strategy for fabricating microwave absorbers with dual loss mechanisms advances the development of ceramic-based microwave absorption materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Zhimin An,Changshou Ye,Rubing Zhang,Peng Zhou
A novel flexible and recoverable SiC nanofiber aerogel (SiC nf aerogel) was synthesized by electrospinning and freeze-drying methods. The SiC fibers prepared by electrospinning technique, have a fine diameter (~600 nm) and excellent flexibility. On this basis, the fibers are stirred at a high-speed and then subjected to freeze-drying and high-temperature treatment to prepare a SiC nf aerogels. The fabricated SiC nf aerogels possess low density (0.039–0.041 g/cm 3 ), excellent thermal insulation (0.025–0.031 W/(m∙K)), and mechanical properties of recoverable strain (~40%). Meanwhile, the SiC nf aerogels show excellent electromagnetic (EM) wave absorption characteristics, which have the effective absorption bandwidth of 9–11.5 GHz (reflection loss (RL) < −10 dB, more than 90% EM wave was absorbed) and minimum RL value attained −21.41 dB at 10.5 GHz with the thickness of 3 mm. The successful preparation of the novel multifunctional material can be used for high temperature insulation materials and electromagnetic wave absorbing materials in harsh environments.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Jinyu Guo,Jianjun Chen,Jinxia Li,HAFSA,Hao Chen
In order to improve the high-temperature resistance and thermal insulation of SiC nanofiber aerogel, the structural design and preparation of SiC nanofiber composite aerogel felt were carried out based on the heat transfer mechanism. A novel multi-layer SiC nanofiber aerogel felt was prepared with the ablative layer (ZrO 2 /ZrSiO 4 anti-oxidation layer), opacifiers layer (TiO 2 and SiC), and heat insulation layer (SiC nanowire aerogel). Compared with the single SiC nanowire aerogel, the oxidation resistance temperature of SiC nanofiber composite aerogel felt increased from 1300 ℃ to 1500 ℃ during aerobic calcination. With the butane gun ablation, the back temperature of the single SiC nanofiber aerogel felt was 308 ℃, while the back temperature of the composite aerogel felt was only 130 ℃. The structural design of the multi-layer SiC nanofiber composite aerogel felt provides an approach to improving thermal insulation properties in extreme environments.
研究领域:
材料科学
·
热力学工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2023
·Vol. 20
·期 3
·1617-1623
·
IF 2.1
Debao Liu,Chao Zhang,Yahui Xue
In this study, the ultralong SiC nanofibers (SiC NFs) were synthesized through the sol–gel method assisted the chemical vapor deposition technique. The scanning electron microscope, transmission electron microscopy, X-ray diffraction, Raman, Fourier transform infrared, and X-ray photoelectron spectroscopy techniques were systematically employed to investigate the microstructure, morphology, and phase composition of the as-prepared products. The results demonstrated that the as-obtained products were β-SiC nanofibers with face-centered cubic crystal structure. Meanwhile, the ultralong SiC NFs present an average diameter of about 18 nm and a length up to several hundreds of micrometers and grew along the [1 1 1] direction with a planar stacking faults. In addition, we also investigated the formation mechanism and growth process of the ultralong SiC NFs. The successful preparation of such ultralong SiC NFs provides new idea for fabricating of other silicon-based ultralong nanofibers.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Ruyi Sha,Bingzhu Wang,Jixiang Dai,Jianjun Sha
Ceramic aerogels are promising high-temperature thermal insulation materials due to their outstanding thermal stability and oxidation resistance. However, restricted by nanoparticle-assembled network structures, conventional ceramic aerogels commonly suffer from inherent brittleness, volume shrinkage, and structural collapse at high temperatures. Here, to overcome such obstacles, 3D ultralight and highly porous carbon tube foams (CTFs) were designed and synthesized as the carbonaceous precursors, where melamine foams were used as the sacrificial templates to form the hollow and thin-wall network structures in the CTFs (density: ∼4.8 mg cm–3). Then, the arbitrary-shaped silicon carbide (SiC) nanofibrous aerogels (SNFAs) were obtained through a simple chemical vapor deposition (CVD) process on the CTFs. The resulting SNFAs exhibited excellent comprehensive performances: ultralow density (4.2 mg cm–3) and thermal conductivity (21.3 mW m–1 K–1 at room temperature), excellent rigidity (specific modulus: 13.2 kN·m kg–1), and resilient compressibility. The SNFAs could support over 2100 times their weight without visible deformation. Furthermore, the SNFAs also showed exceptional high-temperature thermal stability, which means that they could withstand 1100 °C in an air atmosphere and 1550 °C in an inert atmosphere. These superior comprehensive performances enable SNFAs to be suitable for thermal insulation in harsh environments.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Limeng Song,Bingbing Fan,Yongqiang Chen,Hailong Wang,Hongxia Li,Rui Zhang
Multifunctional high-level performance electromagnetic wave (EMW) absorbing materials is receiving increasing attention with the rapid development of modern information technology. However, current EMW absorbing materials usually have single function and poor thermal and chemical stability, which seriously hinders the practical application of these materials. Herein, to broaden the application fields of the EMW absorption materials, a multifunctional SiC nanofiber aerogel (SiC NFA) was prepared by using chemical vapor deposition (CVD) technology in this work. The as-synthesized SiC NFA exhibits a quite low density (∼9 mg cm −3 ), excellent mechanical performance, high fatigue-resistant, satisfactory refractory property, high temperature thermal stability and good thermal insulation performance. Moreover, the oil-modified SiC NFA has a dramatic hydrophobicity , resulting in a good self-cleaning performance. This SiC NFA also achieves a superior EMW-absorbing property with a minimum refection loss (RL min ) value of −39.37 dB at 7.04 GHz when its thickness is 1.9 mm. These inspiring findings lay a foundation for the subsequent development of multifunctional EMW absorbents.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2025
·
IF 11.6
Junjie Wang,Cheng Wang,Haitao Yang,Hui Zhang,Dunyan Jiang,Shikuo Li
Design novel interfacial structure material to achieve highly efficient electromagnetic interference (EMI) shielding is one of the biggest challenges. Herein, the asymmetric C/SiC nanofiber film with conductive-dielectric gradient was precisely in situ prepared through the carbon thermal reduction reaction during the Flash Joule Heating (FJH) process. For the Fick diffusion of SiO 2 vapor, the SiC nanoparticles were gradually anchored on the carbon fibers with a gradient distribution from bottom to top. The electrical conductivity of the asymmetric C/SiC nanofiber film was thus continuously increasing from about 7.97 S cm −1 (bottom) to 0.59 S cm −1 (top). As a result, the asymmetric C/SiC nanofiber film achieved a maximum EMI shielding effectiveness (62.0 dB) in the X-band with a thickness of 1.5 mm, and superior stability in various extreme conditions. Moreover, the EMI shielding effectiveness of the asymmetric C/SiC nanofiber film can be adjusted by altering the incident direction or the film thickness. The effects of gradient structure on the potential distribution and electromagnetic wave loss for the asymmetric film were investigated by the Kelvin probe force microscope and finite element simulation analysis. This work provides a novel insight into designing reasonable interfacial structure to modulate EMI shielding performance.
研究领域:
材料科学
·
电磁学
✓ 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）