JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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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 .
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Fu-Chen Liu,Bo-Wen Chen,De-Wei Ni,Fei-Yan Cai,Xue-Gang Zou,Chun-Jing Liao,Hong-Da Wang,Yu-Sheng Ding,Shao-Ming Dong
Long-term ablation behavior of Al 4 SiC 4 -YB 4 modified C f /ZrB 2 -SiC composites was characterized by air plasma torch at 2600 °C for 300 s. The phase composition and the microstructure evolution of the composites were investigated. The addition of YB 4 promotes the formation of nano t- Zr 0.92 Y 0.08 O 1.96 crystals, decreasing the phase transition stress in the oxide layer and reducing the volatilization of the glassy phase . However, the addition of Al 4 SiC 4 reduces the melting point of Zr-based oxides and the viscosity of the oxide layer. Therefore, the air plasma torch blows the oxide layer away, leading to the increase of linear recession rate.
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高影响因子
CARBON
·
2025
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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.
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 108
·期 1
·e20141
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IF 3.5
Fang He,Yejie Cao,Yongsheng Liu,Jingxin Li,Jing Wang,Binghui Zhang,Ning Dong
SiC f /SiC composites have emerged as one of the most promising materials for aero-engine hot-end structures. However, their performance is limited by their susceptibility to oxidation and corrosion reactions with oxygen and water vapor. To overcome this challenge, antioxidant-modified phases are introduced into matrices of SiC f /SiC composites which improve their water and oxygen resistance. In this study, the resistance of SiC f /SiC composites modified by yttrium silicate matrix (SiC f /SiC-YS composites) to air at 1000–1400°C and water-oxygen environments at 1200°C was investigated. The diffusion paths of oxygen in SiC f /SiC-YS composites and the antioxidant behavior of the yttrium silicate matrix were discussed. Additionally, the differences in oxygen and water-oxygen corrosion resistance of SiC f /SiC-YS composites at the same temperature were compared. The strength retention of SiC f/ SiC-YS composites after oxidation and water-oxygen corrosion at 1200°C were 138.6% and 108.8%, respectively. This indicates that the addition of water vapor accelerated the degradation of SiC f /SiC-YS composites. By comparing with SiC f /SiC composites, it can be concluded that the modification of the yttrium silicate matrix considerably improved the oxidation resistance of SiC f /SiC composites.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
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IF 3.779
Anzhe Wang,Ping Hu,Cheng Fang,Dongyang Zhang,Xinghong Zhang
The effects of cooling rate and initial temperature on thermal shock behavior of ZrB 2 -SiC ceramic were studied by water spraying method with a thermocouple real-time temperature acquisition technique for the first time. It was shown that the cooling rate could be adjusted by changing the water flow rate, and the fracture behavior strongly depended on both the cooling rate and initial temperature. When the extreme value of cooling rate was constant, the decrease of initial temperature would lead to the increase of thermal stress, accompanied by a more serious damage of material, which was mainly because of the nonlinear relationship between thermal expansion coefficient and temperature.
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高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Yao Feng,Shuyi Lai,Le Yang,Ralf Riedel,Zhaoju Yu
Polymer-derived porous Bi 2 WO 6 /SiC(O) nanocomposites were prepared by a simple mechanical mixing of Bi 2 WO 6 nanopowders with a polyorganocarbosilane, namely allylhydridopolycarbosilane (AHPCS), followed by pyrolysis of the resulting blend at 700 °C for 2 h. The Bi 2 WO 6 nanopowders were synthesized by the reaction between Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 and characterized by means of X-ray diffraction (XRD) and dynamic light scattering (DLS). The cross-linking and polymer-to-ceramic transformation of the physically blended Bi 2 WO 6 /AHPCS were determined by Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA). TEM studies revealed that the final ceramic composite is comprised of Bi 2 WO 6 nanoparticles homogeneously embedded in a polymer-derived SiC(O) matrix. Nitrogen sorption isothermal analysis showed the meso-macroporous feature of resultant Bi 2 WO 6 /SiC(O) nanocomposites. Finally, the porous Bi 2 WO 6 /SiC(O) composites show a high photodegradation efficiency (ca. 90%) towards a model organic dye Rhodamine B (RhB) under UV irradiation. Therefore, the synthesized ceramic composite has to be considered as a promising candidate material for purification of water contaminated with organic dyes.
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高影响因子
MATERIALS CHARACTERIZATION
·
2017
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IF 2.714
Baisong Guo,Xinming Zhang,Xi Cen,Xinhua Wang,Min Song,Song Ni,Jianhong Yi,Tao Shen,Yong Du
By hybridizing carbon nanotubes (CNTs) into SiC reinforced Al matrix composites , a novel composite was fabricated to achieve excellent mechanical properties and low coefficient of thermal expansion simultaneously. The study demonstrated that the CNTs can help to acquire the uniform dispersion of SiC particles in the Al matrix, because of their interaction during ball milling and hot rolling processes. In addition, the results revealed that such design optimizes both the mechanical and thermal properties, due to homogeneous microstructure as well as tight and uniform interfaces induced by the addition of CNTs. Strengthening mechanism and Sideridis's model were used to discuss the effects of the CNTs on the mechanical and thermal properties. This study opens up an unexplored avenue for simultaneous improvement of the mechanical and thermal properties of metal matrix composites .
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高影响因子
Materials
·
2018
·Vol. 11
·期 3
·350
·
IF 2.467
Guangyuan Yang,Zhixiong Huang,Xu Wang,Bo Wang
The paper proposed a method to improve the anti-oxidation performance of carbon fibers (CF) at high temperature environment by coating silicon dioxide (SiO2) and silicon carbide (SiC). The modified sol-gel method had been used to ensure the proper interface between fibers and coating. We used polydimethylsiloxane and ethyl orthosilicate to make stable emulsion to uniformly disperse SiC nanoparticles. The modified SiO2/SiC coating had been coated on CF successfully. Compared with the untreated CF, the coated fibers started to be oxidized around 900 °C and the residual weight was 57% at 1400 °C. The oxidation mechanism had been discussed. The structure of SiC/SiO2coated CF had been characterized by scanning electron microscope and X-ray diffraction analysis. Thermal gravimetric analysis was used to test the anti-oxidation ability of CF with different coatings.Keywords:carbon fiber;oxidation resistance;coating;characterization
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Fengdan Xue,Kechao Zhou,Ning Wu,Hang Luo,Xiaofeng Wang,Xuefan Zhou,Zhongna Yan,Isaac Abrahams,Dou Zhang
In this study, a commercial polycarbosilane (PCS) and divinylbenzene (DVB) were used as the preceramic polymer precursor and crosslinking agent, respectively to form porous silicon carbide (SiC) ceramics by freeze casting DVB/camphene/PCS solutions. Porous silicon carbide (SiC) with a dendritic pore structure and connecting bridges was obtained after pyrolysis at 1200 °C. The effects of DVB and PCS content on the rheological properties of the solution and the morphological characteristics and the compressive strengths of SiC ceramics were investigated. The use of DVB and the resulting chemical cross-linking yielded modified pore characteristics and much lower oxygen content in pyrolyzed SiC compared to the conventional thermal curing method. A compressive strength of 18.7 MPa was obtained for pyrolyzed SiC prepared with 20 wt% PCS and a 0.2 DVB/PCS mass ratio.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Xing Liu,Jing Wang,Yuting Zhang,Gang Guo,Jiakuan Yang,Shushan Yuan,Bart Van der Bruggen
Catalytic ceramic membranes (CCM) have attracted increasing attention in membrane material research due to their catalytic and separation functions. However, it is difficult to obtain stable CCM with excellent catalytic performance via common methods. Herein, SiC ceramic membrane loaded with Co, Cu bimetal were prepared by vacuum filtration method and heat treated at H 2 atmosphere (CoCu@SiC-H CCM). Results confirmed that heat-treated at H 2 atmosphere can enhance the catalytic performance of membrane. The first-order rate constant of the CoCu@SiC-H CCM/ peroxymonosulfate(PMS) system reached 0.01473 ms −1 , which is 10 3 -10 5 times greater than previously researches (0.0409–0.7588 min −1 ). Optimal CoCu@SiC-H CCM/PMS system achieved 98.02 % degradation of sulfamethoxazole in 1 min. The CoCu@SiC-H CCM presents outstanding catalytic performance due to the generation of Co 0 and the increase of oxygen vacancy concentration. OH and SO 4 − play important roles in the CoCu@SiC-H CCM/PMS degradation system. This work provides a new design method for preparing catalytic ceramic membranes with excellent catalytic performance, which can efficiently treat refractory wastewater in harsh environments.
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高影响因子
ACS Catalysis
·
2025
·
IF 13.1
Xiaochao Wang,Xuteng Zhao,Guangzhao Zhou,Ting Chen,Qi Chen,Nicolas Alonso-Vante,Zhen Huang,Yiran Zhang,He Lin
Hydrogen (H2) production from the ammonia (NH3) decomposition reaction (ADR) is promising to build a carbon-free H2 world. However, the temperature usually needs to be above 400 °C to achieve more than 80% NH3 conversion in conventional thermal ADR (TADR), which results in high energy consumption. In this work, an electrically driven, energy-saving gaseous ammonia decomposition reaction (EADR) strategy without external heating on a SiC-mediated Ru/Al2O3 composite catalyst is presented to achieve highly efficient ADR under much milder conditions than TADR. An 85% NH3 conversion was achieved at ca. 230 °C at weight hourly space velocities (WHSVs) of 12,000 mL gcat–1 h–1, close to the equilibrium conversion at the corresponding temperature, and a more than 4-fold reduction in energy consumption was achieved. The efficient EADR can be attributed to the enhanced N–N recombination and hydrogen migration at low temperatures due to the effective current carrier activation effect in the electric field. The energy-saving electrification strategy allows for solving the common dilemma of improving the NH3–H2 conversion efficiency at low temperatures without a complex catalyst design.
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高影响因子
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 1.6
Xiangzhou Miao,Baijun Yan
In this study, thermodynamic calculations indicate that using silicon carbide (SiC) as an additive for the reductive decomposition of industrial by-product (IBP) gypsum is a feasible method to lower decomposition temperature and avoid the generation of liquid phase. Experimental results show that the decomposition rate of IBP gypsum exceeded 90% at 950°C for 2 h, while avoiding the generation of liquid phase. In addition, it was found that an intermediate product, 2Ca 2 SiO 4 ·CaSO 4 , was generated during the decomposition process. Through the reaction mechanism and kinetics analysis of IBP gypsum and SiC, the decomposition process can be divided into two steps. The first step was the conversion of CaSO 4 to 2Ca 2 SiO 4 ·CaSO 4 (decomposition rate <60%), and the chemical reaction was the controlling step. The second stage was the conversion of 2Ca 2 SiO 4 ·CaSO 4 to Ca 2 SiO 4 (decomposition rate >60%), and three-dimensional diffusion was the controlling step. This novel method not only successfully lowered the decomposition temperature of IBP gypsum, but also avoided liquid phase generation.
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高影响因子
危险品化学品经营许可证（带存储）