JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Zhaozhao Lv,Jianjun Sha,Guanzhang Lin,Jin Wang,Yongchun Guo,Shengquan Dong
In recent years, the research of hybrid composites reinforced by multiple reinforcements has received increasing attention because these composites have great potential to be tailored for various applications. In the present work, hybrid aluminum (Al) matrix composites reinforced with SiC particles and carbon fibers (SiC p -C fs /Al composites) were fabricated by the colloidal dispersion and suction filtration method. It was found that SiC p -C fs /Al composites had a dense structure and the carbon fibers and SiC particles were uniformly distributed in the Al matrix. The mechanical properties of SiC p -C fs /Al composites with different reinforcement volume fractions were investigated. The results showed that the SiC p -C fs /Al composites exhibited high tensile strength and elastic modulus (tensile strength 207 MPa and elastic modulus 92 GPa) when the volume fraction of SiC particles was 5% and the volume fraction of carbon fiber was 7%, which were significantly higher than that of SiC p /Al composites with 5% volume fraction of SiC particles (tensile strength 112 MPa and elastic modulus 80 GPa). The homogeneous distribution of carbon fibers and SiC particles in the Al matrix, which serves as co-reinforcing, is responsible for the high tensile strength and elastic modulus of SiC p -C fs /Al composites. The coefficient of thermal expansion (CTE) of SiC p /Al composites and SiC p -C fs /Al composites were measured at temperatures ranging from 25 °C and 400 °C. The results showed that the addition of carbon fibers caused the CTE of SiC p -C fs /Al composites to be much lower than that of SiC p /Al composites.
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高影响因子
BIORESOURCE TECHNOLOGY
·
2019
·
IF 6.669
Lin Jiang,Yunpu Wang,Leilei Dai,Zhenting Yu,Qi Yang,Sha Yang,Deyu Jiang,Zhiyun Ma,Qiuhao Wu,Bo Zhang,Yuhuan Liu,Roger Ruan
A ZSM-5/SiC composite catalyst was synthesized and characterized by Brunauer–Emmett–Teller analysis, X-ray diffraction, and scanning electron microscopy in this study. The composite catalyst had the characteristics of ZSM-5 and SiC, and the surface of SiC grew evenly with a layer of ZSM-5. The effect of the composite catalyst on the product distribution and chemical composition in a co-pyrolysis downdraft system was investigated. In a down system with a catalytic temperature of 450 °C, a feed-to-catalyst ratio of 2:1, and a soybean-soapstock-to-straw ratio of 1:1, the proportions of alkanes, olefins, aromatics, and phenoxy compounds were 6.82%, 4.5%, 73.56% and 11.11%, respectively. The composite catalyst combined the catalytic performance of ZSM-5 and SiC, increasing the proportion of aromatics and decreasing the proportion of oxygen-containing compound in the bio-oil. Moreover, the composite catalyst maintained its activity after reusing several times.
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PubMed
高影响因子
JOURNAL OF RARE EARTHS
·
2019
·
IF 2.846
Kang Xi,Yong Wang,Kang Jiang,Jing Xie,Ying Zhou,Hanfeng Lu
The interaction between Pt and its various supports can regulate the intrinsic electronic structure of Pt particles and their catalytic performance. Herein, Pt/CeO 2 and Pt/SiC catalysts were successfully prepared via a facile Pt colloidal particle deposition method, and their catalytic performance in CO oxidation was investigated. XRD , TEM, XPS and H 2 -TPR were used to identify the states of Pt particles on the support surface, as well as their effect on the performance of the catalysts. Formation of the Pt–O–Ce interaction is one of the factors controlling catalyst activity. Under the oxidative treatment at low temperature, the Pt–O–Ce interaction plays an important role in improving the catalytic activity. After calcining at high temperature, enhanced Pt–O–Ce interaction results in the absence of metallic Pt 0 on the support surface, as evidenced by the appearance of Pt 2+ species. It is consistent with the XPS data of Pt/CeO 2 , and is the main reason behind the deactivation of the catalyst. By contrast, either no interaction is formed between Pt and SiC or Pt nanoparticles remain in the metallic Pt 0 state on the SiC surface even after aging at 800 °C in an oxidizing atmosphere. Thus, the Pt/SiC shows better thermal stability than Pt/CeO 2 . The interaction between Pt and the active support may be concluded to be essential for CO oxidation at low temperature, but strong interactions may induce serious deactivation of catalytic activity.
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高影响因子
IRANIAN POLYMER JOURNAL
·
2018
·Vol. 27
·期 9
·621-628
·
IF 1.278
Du Haiyan,Ren Zhe,Xu Yuyu
Microwave (MW)-induced shape-memory poly(vinyl alcohol)/poly(acrylic acid) (PVA/PAA) interpenetrating polymer networks (SMP-IPNs) were prepared through in situ polymerization. Silicon carbide (SiC) nanoparticles were modified by 3-(methacryloyloxy) propyltrimethoxysilane (KH570). 3-(Methacryloyloxy) propyltrimethoxysilane was covalently bonded on the surface of SiC through the reaction of silanol and the methoxy groups. The polymerization of acrylic acid (AA) using N,N ′-methylenebis (2-propenamide) (MBA) as cross-linker in PVA solution was initiated through the double bonds of KH-570 grafted on SiC, leading to a PAA polymer network cross-linked with MBA. The PVA molecular chains run through the PAA cross-linking network and form an IPN structure. Therefore, SiC as a strong MW absorbing material could be chemically cross-linked into polymer matrix. The effect of composition on the properties of SMP-IPN was studied using dynamic mechanical analysis, dielectric properties and shape memory effect (SME) test. The results showed that the introduction of SiC in IPNs not only provided samples with excellent MW-induced shape memory effect (SME), but also caused a higher equilibrium temperature under MW irradiation. Moreover, both SiC content and applied MW power affected the shape recovery properties of PVA/PAA interpenetrating composites. MW-induced SMPs offered great advantages such as fast recovery, high recovery rate, and remote actuation. This study provides the potential applications of the fast and environmentally friendly SMPs used as MW-responsive sensors, implantable devices, etc.
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高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Yuan Cheng,Chang Liu,Ping Hu,Boqian Sun,Peitao Hu,Chen Ma,Cheng Fang,Dongyang Zhang,Jiaxin Feng,Shanyi Du
Graceful toughness and high strength are mutually exclusive in engineering ZrC-SiC ceramic, which are hard to be possessed simultaneously. Here, the pyrolytic carbon (PyC) coated short chopped carbon fibers were utilized to toughen ZrC-SiC ceramic, tackling the dilemma between toughness and strength. Through the uniform incorporation of PyC coated short chopped carbon fibers, the penetration crack mode of ZrC-SiC was changed into an obviously deflecting propagation path with closed phenomenon. The PyC coating brought about a relatively weak interface bonding and guided the crack propagate along the weak interface, consequently resulting in a more flexuous crack propagation instead of passing through the fibers directly. Meanwhile, the fibers received effective protection of coating inhibiting from performance degradation. The PyC coated C f /ZrC-SiC obtained a fracture toughness highly reaching 7.57 ± 0.33 MPa m 1/2 with a rivaling flexural strength at 268 ± 16 MPa. Moreover, the graceful load-displacement curve is illustrated with a smoothly extended displacement of 0.12 mm and increased load to 83 N, which forms an obvious yield plateau. To some degree, this work provided an effective solution to tackling the dilemma between toughness and strength of engineering ZrC-SiC ceramic.
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高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Yongzhao Hou,Bo Xiao,Zhiyuan Sun,Wen Yang,Songsong Wu,Shuai Qi,Guangwu Wen,Xiaoxiao Huang
With the rapid development of high power electromagnetic (EM) equipment and high-speed aircraft, the powerful and high oxidation-resistance absorbers are fundamentally desirable for the EM field. Herein, a novel high temperature anti-oxidative SiC/Fe 3 Si/CNTs composite is synthesized by a facile polymer derived ceramic (PDC) route from a Fe-containing polysilyacetylene (PSA). The microstructure of as-prepared SiC/Fe 3 Si/CNTs composite absorber is featured by micro-sized SiC ceramic grains with spherical Fe 3 Si nanoparticles and carbon nanotubes (CNTs) attached to. The vector network analyzer tests show a tunable wave-absorbing performance by adjusting the thickness of layer, and the effective bandwidth (the reflection loss < −10 dB) is 3.3–16.8 GHz for the sample S-1400 (heat treatment at 1400 °C in nitrogen flow). The minimal RL value is −41.2 dB at 10.5 GHz at a thickness of 2 mm and an effective bandwidth is nearly 4 GHz (12.9–16.9 GHz) at the thickness of only 1.5 mm. Moreover, after the oxidation treatment at 800 °C in the air, this absorber maintains the main structure and shows a good high temperature oxidation resistance . This absorber still remains excellent wave absorption property, in view of a minimal RL value of −40 dB at the thickness of 3 mm and a bandwidth of 4.8 GHz (10.4–15.2 GHz) at the thickness of 2.5 mm. The mechanism of high EM wave absorption performance is studied and attributed to the impendence matching, polarization, and the magnetic properties . Thus, the SiC/Fe 3 Si/CNTs composite is a promising EM absorber for high-temperature EM wave-absorbing applications.
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高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Qianglong He,Jingjing Xie,Aiyang Wang,Chun Liu,Tian Tian,Lanxin Hu,Chenhong Yi,Zhixiao Zhang,Hao Wang,Weimin Wang,Zhengyi Fu
B x C-TiB 2 -SiC ceramic composites were fabricated via reactive hot pressing using TiC, B, and Si as the raw materials. The phase transition process was studied by heating powder mixtures to different temperatures in combination with X-ray diffraction analysis. The stoichiometric ratio between B and C in boron carbide is variable. A series of powder mixtures containing excess boron (0 wt%, 10 wt%, 20 wt%, or 30 wt% B) were sintered, and the microstructures and mechanical properties of the composites were investigated. The results showed that the B 6.1 C-TiB 2 -SiC composite prepared from the starting powders with 30 wt% excess boron had the best comprehensive mechanical properties , with a relative density, hardness, bending strength , and fracture toughness of 98.32%, 33.2 GPa, 840 MPa, and 5.22 MPa m 1/2 , respectively. Excessive boron substitution may cause lattice distortion in boron carbide , and the boron carbide grains in this state may form a large number of twins under the compressive stress generated by the TiB 2 grains, which will affect the properties of the composites.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Fenghui Xie,Wei Wu,Huanbo Hu,Junjian Ye,Lu Cui,Zhengyi Wang,Wenxue Zhang
In order to enhance the mechanical properties of lattice structure parts made of thermoplastic polyurethane elastomer (TPU) prepared by selective laser sintering (SLS) technology, this study employed the oxidative self-polymerization of dopamine (DA) to prepare polydopamine-modified silicon carbide whiskers (PDA-SiC) fillers with a core-shell structure. These fillers were uniformly dispersed in a waterborne polyurethane (WPU) to form a coating solution, which was then used to prepare TPU printed parts with a uniform PDA-SiC/WPU coating structure through post-treatment impregnating-curing processes. The coated TPU parts exhibited tensile strength, elongation at break, and room temperature compressive strength of 8.37 MPa, 610.2%, and 1.062 MPa, respectively, representing improvements of 40.9%, 33.2%, and 353.3% compared to pure TPU parts. This approach effectively enhanced the mechanical performance of SLS-formed TPU parts, strengthening their application in the field of flexible lattice structure parts.
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高影响因子
Journal of Materials Research and Technology-JMR&T
·
2025
·
IF 6.6
Yuanming Zhou,Mingyang Li,Shuxin Li,Shuangxing Zhu,Ruizhi Liu,Maozhong Yi,Ke Peng
The oxide layer that forms on the surface of C/C composites matrix-modified with multiphase ultra-high temperature ceramics is generally loose and poorly bonded, limiting its effectiveness in enhancing the ablation resistance of C/C composites. In this study, C/C composites were matrix-modified using solid solution ceramic TaZr 2 C 3 -SiC and multiphase ceramic TaC-2ZrC-SiC, both with the same Zr/Ta ratio. The C/C-TaZr 2 C 3 -SiC and comparative sample C/C-TaC-2ZrC-SiC composites were prepared through a high-solid-loading slurry impregnation method combined with a precursor infiltration and pyrolysis process. The flexural properties were evaluated, and ablation tests were conducted under an oxyacetylene flame. Compared to C/C-TaC-2ZrC-SiC, the C/C-TaZr 2 C 3 -SiC sample exhibited superior flexural properties and ablation resistance. The flexural strength, elastic modulus, and fracture toughness improved by 10.80%, 29.75%, and 37.67%, respectively. The mass and linear ablation rates were reduced by up to 85.49% and 77.26%, respectively. The superior ablation resistance of C/C-TaZr 2 C 3 -SiC was attributed to the formation of the anti-ablation microstructure composed of the Ta-rich oxide binder phase and Zr-rich oxide skeleton phase in the Ta-Zr-O oxide layer. The microstructure enhanced the viscosity of the oxides and strengthened their interfacial bonding, effectively suppressing the splashing and consumption of surface oxides under high heat flux while preventing their accumulation in the brim ablation region. The oxide layer was more compact and tightly bonded to the composite surface, providing the composites with significantly improved ablation protection. These findings provide a novel and effective approach for further improving the ablation resistance of C/C composites.
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高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Wenhu Hong,Shun Dong,Ping Hu,Xiaoguang Luo,Shanyi Du
Enhanced microwave absorption properties of porous PDC-SiC/Si 3 N 4 ceramics were successfully prepared through in situ growth of Si 3 N 4 nanowires (NWs) by the unidirectional freeze casting of Si 3 N 4 /camphene slurries with various polycarbosilane (PCS) contents at 1400 °C in N 2 . Si 3 N 4 NWs were in situ formed in the pore channels via a vapor-solid (VS) mechanism, the content of Si 3 N 4 NWs increased with increasing of PCS content, which tailored the microstructure and mechanical property of porous PDC-SiC/Si 3 N 4 ceramics. With the increase of PCS content, the minimum reflection coefficient (RC) of porous PDC-SiC/Si 3 N 4 ceramic decreased from −20.2 dB to −56.2 dB, and the effective absorption bandwidth (EAB) increased from 5.3 to 7 GHz, demonstrating that the porous PDC-SiC/Si 3 N 4 ceramics decorated with Si 3 N 4 NWs had a superior microwave-absorbing ability, which could be ascribed to the electronic dipole polarization and interfacial scattering enhanced by the various interfaces among Si 3 N 4 , in-situ formed PDC-SiC nanograins, nanosized carbon and Si 3 N 4 NWs phases. These findings provide significance guidance in the development of new broadband EM absorbing materials.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2013
·
IF 1.913
Zhihang Jiang,Yongjun Ma,Yong Zhou,Shanglian Hu,Chaojiang Han,Chonghua Pei
By converting modified silica aerogels to the corresponding silicon/silicon carbide (Si/SiC) without losing its nanostructure, three-dimensional mesoporous (3DM) Si/SiC composites are successfully synthesized via one-step magnesothermic reduction at relative low temperature (650 °C). The phase composition and microstructure of the resulting samples are measured by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), Raman spectra, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). N 2 -sorption isotherms results show that the products have high Brunauer–Emmett–Teller (BET) specific surface areas (up to 656 m 2 g −1 ) and narrow pore-size distributions (1.5–30 nm). The composites exhibit a strong photoluminescence (PL) in blue-green light region (peak centered at 533 nm). We have set out work on the biocompatibility and enhancing PL of samples. As a result of excellent performances of the composites, it can be expected to have significant application in optoelectronics, biosensors, biological tracer and so on.
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高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Fengrui Zhai,Shuang Li,Jialin Sun,Zhongzhou Yi
h -BN-SiC ceramic composites with different SiC contents were fabricated by spark plasma sintering . The results indicate that the addition of hard SiC particles has a remarkable effect on the densification, microstructure, mechanical properties and thermal shock resistance of the composites. Compared with pure h -BN ceramic, the relative density and mechanical properties of h -BN-SiC ceramic composites were improved obviously. The optimal properties of h -BN-SiC ceramic composites were obtained at SiC content of 25%, and the relative density, flexural strength and fracture toughness reached 97.8%, 289.2 MPa and 3.45 MPa m 1/2 , respectively. Moreover, the relationship of fracture toughness and fracture mode was discussed. The thermal shock test results showed that the h -BN-SiC ceramic composite with the SiC content of 25% exhibited excellent thermal shock resistance, presenting critical temperature difference up to 900 °C. The high temperature oxidation of h -BN and SiC on material surface led to the formation of borosilicate glass phase, which could heal the surface microcracks and then improve the thermal shock resistance.
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高影响因子
危险品化学品经营许可证（带存储）