COMPOSITES PART B-ENGINEERING
·
2016
·
IF 3.85
Fei-Peng Du,Sui-Sui Xie,Fang Zhang,Chak-Yin Tang,Ling Chen,Wing-Cheung Law,Chi-Pong Tsui
Geopolymers have emerged as a promising alternative to ordinary cement due to their attractive physical and thermal properties. The typical compressive strength of geopolymers and their composites is usually limited to around 80 MPa, therefore they should be further strengthened for wider applications, such as ultrahigh strength concrete and bone replacement. This paper presents a facile method for enhancing the compressive strength by incorporating silicon carbide particles (SiC p ) and silicon carbide whiskers (SiC w ) into a geopolymer matrix via the geopolymerization of metakaolin (MK). The effects of the reinforcement of SiC p and SiC w on the microstructure, thermal properties and compressive properties of the composites were investigated. The SEM images showed that both SiC p and SiC w were well dispersed in the geopolymer matrix. Due to the bridging effect among the SiC w particles, the silicon carbide whisker/geopolymer (SiC w /GP) composites possessed higher porosity and lower density, and thus lower thermal stability and thermal conductivity as compared with the silicon carbide particle/geopolymer (SiC p /GP). The mechanical tests showed that the compressive strength of SiC p /GP composites increased with the increase of SiC p concentration. With an optimum concentration of 10 wt % of SiC p , the compressive strength of the composite was enhanced to 155 MPa, corresponding to a 100% increase as compared with the unfilled geopolymer.
研究领域:
材料科学
·
建筑工程
✓ 已验证
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2024
·
IF 3.9
Hongli Liu,Weiqiang Xie,Qi Zhao,Ying Sui,Zhongxian Liu,Tiangang Zhang,Zhiqiang Zhang,Shuang Sun,Jianwei Jia
SiC fibers have excellent properties such as high-temperature resistance, oxidation resistance, and high strength, and it is an ideal material for high-temperature structures. However, with the continuous development of technology, the application conditions of the material are becoming more and more stringent. Therefore, the properties of SiC fibers need to be further improved to adapt to the ultra-high temperature environment. In this work, yttrium was introduced into the precursor solution using the precursor transformation method, and yttrium-containing SiC fibers were prepared by electrospinning. The microstructure, chemical composition, oxidation resistance, and mechanical properties of the specimens were tested. The results showed that the samples have good thermal stability after ceramization at 1400 °C, and the Y 2 SiO 5 produced in the fiber matrix further improves the antioxidant properties of the fibers. Additionally, the yttrium-containing SiC fibers maintained excellent flexibility, and the high-temperature resistance of SiC fibers was significantly enhanced.
研究领域:
材料科学
·
高温结构材料
✓ 已验证
DOI
高影响因子
Additive Manufacturing
·
2021
·
IF 10.998
Jiwei Cao,Muhammad Idrees,Guoqiang Tian,Jian Liu,Shufeng Xiong,Jingkun Yuan,Pei Wang,Zhiyuan Liu,Changyong Liu,Zhangwei Chen
Lightweight and strong silicon carbide (SiC) ceramics with complex lattice structures were fabricated by vat photopolymerization 3D printing technology followed by a one-step pyrolysis process . The UV-light penetration depth of the SiC ceramic slurries was increased more than three times based on the formation of SiC@SiO 2 core@shell structured particles through pre-oxidation processing. To reduce the sintering temperature and shrinkage of SiC ceramics, 40 vol% solid loading SiC@SiO 2 ceramic slurries mixed with photocurable resins containing 0–70 wt% of polysiloxane were prepared. SiC@SiO 2 /SiOC ceramic with less than 8% linear shrinkage rate was obtained after pyrolysis at 1000–1200 ℃. The pyrolyzed SiC@SiO 2 /SiOC lattice ceramics exhibited a specific strength of 4.6 × 10 4 N m/kg with a cellular density of 0.87 g/cm 3 , surpassing various other lattice structures and porous ceramics with similar porosity. The complex structure forming ability, mechanical performance and its short developing cycle make this technology to be a promising method for structural integrated SiC ceramic manufacturing.
研究领域:
材料科学
·
先进制造
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Zhilei Li,Tao Zhao,Gaojie Yan,Yanan Yuan,Xiaoyan Yu,Kimiyoshi Naito,Qingxin Zhang
With rapid advances in electronic device miniaturization and increasing power density, high thermal conductivity polymer composites with excellent properties are becoming increasingly significant for the progress of next-generation electronic apparatuses. In this work, a new type of three-dimensional (3D) network silicon carbide (SiC) frame and core-shell SiC@SiO 2 (SiC@SiO 2 ) were successfully prepared. The effects of different filler forms (dispersed particle filler and three-dimensional continuous filler network) on the thermal conductivity of the composites were compared. The composites based on the three-dimensional filler network exhibited evidently better thermal conductivity improvement rates, compared to their traditional counterparts. The thermal conductivity of the epoxy/SiC@SiO 2 composite having a total filler content of 17.0 vol% was 0.857 W/m/K, 328.5% higher than that of pure epoxy resin. Similarly, the thermal conductivity of the EP/3D-SiC composite having a total filler content of 13.8 vol% was 1.032 W/m/K, 416.0% higher than that of pure epoxy resin. The abovementioned stats were proven via molecular simulations . We estimated the interfacial thermal resistance (ITR) of the EP/3D-SiC composite to be 5.98 × 10 −8 m 2 K/W, which was an order of magnitude lower than that of the epoxy composites without a 3D network. Simultaneously, computerized molecular simulation technology was used to verify the feasibility of the experiment, which provided new ideas for the preparation of other highly thermally conductive materials .
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Ruiyang Tan,Jintang Zhou,Zhengjun Yao,Bo Wei,Zhong Li
Recently, microwave absorbing materials have been widely used with the development of electromagnetic wave technology such as 5G communication. It is urgent to develop low-cost electromagnetic wave absorbing materials to meet the increasing civil market demand. Herein, we report a novel and simple strategy to synthesize lightweight silicon carbide microwave absorber by calcining tissue and glass microspheres at high temperature. The results show that higher synthesis temperature can improve the crystallinity of SiC, generate more whiskers and reduce the impurity content. This in turn increases the dielectric loss of the material. The products synthesized at 1600 °C have excellent microwave absorption properties. At the thickness of 1.3 mm, it achieves a reflection loss of −32.5 dB and an effective absorption bandwidth of 4.1 GHz. This study broadens the way for the potential reuse of waste paper and glass, and provides a useful reference for the preparation of low-cost microwave absorbing 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
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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2015
·
IF 1.97
Shu-Ting Liu,Kang-kang Yan,Yuan hu Zhang,Shi-di Jin,Ying Ye,Xue-Gang Chen
The increase in electromagnetic pollution due to the extensive exploitation of electromagnetic (EM) waves in modern technology creates correspondingly urgent need for developing effective EM wave absorbers. In this study, we carried out the magnesiothermic reduced the rice husk ash under different temperatures (400–800 °C) and investigated the electromagnetic wave adsorption of the products. The EM absorbing for all samples are mainly depend on the dielectric loss , which is ascribed to the carbon and silicon carbide content. RA samples (raw rice husk ashed in air and was magesiothermic reduced in different temperatures) exhibit poor dielectric properties , whereas RN samples (raw rice husk ashed in nitrogen and was magesiothermic reduced in different temperatures) with higher content of carbon and silicon carbide display considerable higher dielectric loss values and broader bandwidth for RL<−5 dB and −10 dB. For RN samples, the maximum bandwidth for −5 dB and −10 dB decrease with carbon contents, while the optimum thickness decrease with increasing SiC content. The optimum thickness of RN400–800 for EM absorption is 1.5–2.0 mm, with maximum RL of between −28.9 and −68.4 dB, bandwidth of 6.7–13 GHz for RL<−5 dB and 3.2–6.2 GHz for RL<−10 dB. The magnesiothermic reduction will enhance the potential application of rice husk ash in EM wave absorption and the samples benefited from low bulk density and low thickness. With the advantages of light-weight, high EM wave absorption, low cost, RN400–800 could be promising candidates for light-weight EM wave absorption materials over many conventional EM wave absorbers.
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
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Haidong Wu,Wei Liu,Shuai Ge,Cong Tang,Yehua Li,Pengfei Sheng,Shanghua Wu
In this study, the effects of different silicon carbide (SiC) particle sizes on the viscosity and curing behavior of alumina (Al 2 O 3 ) ceramic suspensions were thoroughly investigated. The findings revealed that increasing the size of SiC particles led to a noticeable decrease in the viscosity of the suspension. The Al 2 O 3 ceramic suspension with 0.6 μm SiC powder demonstrated a shallower cure depth and wider excess width compared to the suspension with 1.0 μm SiC powder. Sintering tests demonstrated that the properties of the SiC–Al 2 O 3 ceramics improved at higher sintering temperatures . Moreover, a high-performance honeycomb ceramic was successfully designed and fabricated with a porosity and compressive strength of 30.8 % and 188 MPa, respectively. Finally, the SiC–Al 2 O 3 honeycomb ceramics were effectively applied in heat insulation and oil-water separation applications, demonstrating their remarkable capabilities.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2025
·Vol. 18
·期 10
·2336
·
IF 3.2
Xishi Wu,Zehua Liu,Bingbing Pei,Haibo Wu,Zhengren Huang
In this work, the metal salts were introduced into the resin-solvent gel system to leverage their ortho-substitution effect, thereby accelerating the polymerization-induced phase separation process. Subsequent in-situ carbonization resulted in the preparation of porous carbon materials with three-dimensional interconnected pores. By precisely tuning the parameters of the resin-solvent-metal ion system, control over the pore structure of the porous carbon was achieved, with a porosity range of 16.5% to 66.5% and a pore diameter range of 8 to 248 nm. The addition of metallic salts can simply and effectively increase the pore structure after carbonization, making the infiltration of molten silicon easier. This is beneficial to the joining process of silicon carbide ceramics. Based on these findings, a high-reliability joining technique for large-sized (135 mm × 205 mm) silicon carbide ceramics was developed. The resulting interlayer was dense and defect-free, exhibiting a joining strength of 309 ± 33 MPa and a Weibull modulus of 10.67. These results highlight the critical role of structured porous media in advancing the field of large-sized ceramic joining.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Materials Science
·
2021
·
IF 0
Liping Zhou,Peng Xu,Faxiang Qin
Next-generation packaging materials are expected to have higher thermal conductivity, because the heat accumulated in high-performance electronic equipment should be removed to increase the service life of the equipment. At the same time, the dielectric loss of the material needs to be reduced to lessen signal delay and attenuation, especially for the applications under high frequency. In this work, we introduce nano-silicon carbide (SiC) and carbon nanotubes (CNTs) into the polystyrene (PS) and poly(methyl methacrylate) (PMMA) blends system. The design of two-way migration at the interface of CNTs and SiC nanoparticles is realized through the masterbatch method and processing technology control. As a result, the thermal conductivity is successfully increased up to 75%. Meanwhile, compared to the CNTs single-phase migration system, it effectively reduces the dielectric loss of the nanocomposite and optimizes the electrical insulation. This work has significant practical application value in the design of electronic device substrates and packaging materials, and provides an innovative methodology for the mesostructure design of multiphase nanocomposites.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
Molecular Catalysis
·
2023
·
IF 4.6
Xiaoli Wei,Yifan Wei,Jiaqin Lu,Yunfan Huang,Yiwei Sun,Yu Wang,Lijia Liu,Bing Liu,Wenfeng Han
Transforming potent greenhouse gasses, hydrofluorocarbons (HFCs) to hydrofluoroolefins (HFOs) is an environmentally friendly and low energy input route compared with traditional incineration method. During the conversion process, Lewis acidity of the catalysts play a vital role in the activity. Here, inspired by the fluorinated metal oxide, a novel nonmetallic catalyst SiC was fabricated via sequentially mechanochemical treatment and fluorination. With series characterizations, it demonstrated that on the super surface of SiC, there are thin layers of graphite, COOH species, SiO 2 and Si 4 C 4-x O 2 substrates. Through the mechanochemical treatment, the layers of graphite, COOH species and partial SiO 2 could be grinded off. Hence, the exposed SiO 2 residue could be removed via the fluorination by HFC-152a and HF forming volatile SiF 4 . At the same time, the transition layer, Si 4 C 4-x O 2 was fluorinated to Si 4 C 4-x F 2 accompanied with enhanced Lewis acidity. As a result, the activity of the treated SiC was significantly superior than the unmilled SiC. These findings provide a feasible way to develop the catalytic performances of nonmetallic catalysts for the dehydrofluorination.
研究领域:
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Fang Di,Xin Gu,Yang Chu,Lixiang Li,Xin Geng,Chengguo Sun,Weimin Zhou,Han Zhang,Hongwei Zhao,Lin Tao,Guangshen Jiang,Xueyuan Zhang,Baigang An
Owing to highly theoretical capacity of 3579 mAh/g for lithium-ion storage at ambient temperature, silicon (Si) becomes a promising anode material of high-performance lithium-ion batteries (LIBs). However, the large volume change (∼300 %) during lithiation/delithiation and low conductivity of Si are challenging the commercial developments of LIBs with Si anode . Herein, a sandwich structure anode that Si nanoparticles sandwiched between carbon nanotube (CNT) and silicon carbide (SiC) has been successfully constructed by acetylene chemical vapor deposition and magnesiothermic reduction reaction technology. The SiC acts as a stiff layer to inhibit the volumetric stress from Si and the inner graphited CNT plays as the matrix to cushion the volumetric stress and as the conductor to transfer electrons . Moreover, the combination of SiC and CNT can relax the surface stress of carbonaceous interface to synergistically prevent the integrated structure from the degradation to avoid the solid electrolyte interface (SEI) reorganization. In addition, the SiC (1 1 1) surface has a strong ability to adsorb fluoroethylene carbonate molecule to further stabilize the SEI. Consequently, the CNT/SiNPs/SiC anode can stably supply the capacity of 1127.2 mAh/g at 0.5 A/g with a 95.6 % capacity retention rate after 200 cycles and an excellent rate capability of 745.5 mAh/g at 4.0 A/g and 85.5 % capacity retention rate after 1000 cycles. The present study could give a guide to develop the functional Si anode through designing a multi-interface with heterostructures .
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
WATER RESEARCH
·
2022
·
IF 13.4
Qian Jiang,Yaxin Wang,Yuling Xie,Ming Zhou,Qilin Gu,Zhaoxiang Zhong,Weihong Xing
Both the pore size and surface properties of silicon carbide (SiC) membranes are demonstrated to significantly affect their separation efficiency when used for oily water treatment. However, the potential influences of open porosity together with the pore size of SiC membranes on their surface properties and oil-water separation performance have rarely been investigated. In this work, porous SiC ceramic membranes with tunable open porosity and pore size were purposely prepared and selected to systematically study the effect of pore structure-dependent wettability on the oil-water separation performance. The measured pure water flux of selected membranes as a function of open porosity (34–48%) and pore size (0.43–0.67 μm) was well-fitted by using a modified H-P equation. Interestingly, the hydrophilicity of SiC membranes was improved with the increase in open porosity and pore size, as evidenced by the gradually decreased dynamic water contact angle and underwater adhesion of oil droplets. Further, the open porosity of SiC membranes was found to contribute more to the improved surface wettability. As a result, the stable flux of SiC membranes in oil-in-water (O/W) emulsions was increased by 24% with the increased open porosity while the oil rejection rate remained above 90%. This work quantitatively reveals the contributions of the pore structure to the surface wettability of ceramic membranes, and thus provides an effective pathway to improve their performance in oil-water separation.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）