MATERIALS CHARACTERIZATION
·
2022
·
IF 4.537
Andong Hua,Yishi Su,Yunpeng Cai,Xiaozhen Wang,Kan Liu,He Cao,Di Zhang,Qiubao Ouyang
Due to the high modulus, high strength , low density, excellent wear resistance and good neutron absorption, the boron carbide (B 4 C) particle reinforced aluminum (Al) matrix composites have been widely applied in the aerospace, weaponry, transportation and neutron shielding fields. In response to the increasing requirement of better strength -ductility matching of B 4 C/Al composites, introducing a nano-scale reinforcement into the B 4 C/Al composites becomes an attractive research focus. In this work, the SiC nanowires were ball-milled with Al powders, and then the SiC/Al composite powders were mixed with B 4 C microparticles . Thus, the 15vol. % B 4 C/SiC/Al composites with different volume fractions of SiC nanowires were fabricated by hot-pressing sintering and hot extrusion. B 4 C microparticles and SiC nanowires are uniformly dispersed in the B 4 C/SiC/Al composites, while the introduced SiC nanowires effectively decrease the Al matrix grain sizes . B 4 C/SiC/Al composites produce the better strength-ductility matching than that of B 4 C/Al composites, while the 15vol. % B 4 C/SiC/Al composite with 1vol. % SiC nanowires achieved the best strength-ductility matching. It generates the 281.7 ± 2.7 MPa in yield strength, 351.2 ± 0.1 MPa in ultimate tensile strength and 5.9 ± 0.7% in failure elongation, which are increased by 18.2%, 15.1% and 13.5% compared to the B 4 C/Al composites. Uniformly dispersed B 4 C microparticles and SiC nanowires largely block the dislocation motions and improve the dislocation storage capacity, which results in a more significant hetero-deformation induced (HDI) hardening effect in the B 4 C/SiC/Al composites. Moreover, the B 4 C/Al interfacial transition regions with the added SiC nanowires becomes stronger, which can enhance the load transfer efficiency of the B 4 C/Al interfaces as a result of the existing dislocation hardening zones. In conclusion, it is a good strategy to combine the synergistic strengthening effect of micro-scale and nano-scale reinforcements in the metal matrix composites .
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2022
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IF 6.364
Hao Xiong,Anze Shui,Qingliang Shan,Mei Cai,Xiuan Xi,Bin Du
The SiO 2 layer preferentially generated on the surface of silicon carbide abrasives in Polishing Porcelain stoneware tile Residues (PPR) is corroded by silicate liquid during firing, resulting in continuous oxidation and foaming of silicon carbide, which makes the PPR difficult to be reused. The PPR is fired to form a silicate liquid that wraps micron silicon carbide in it. In this work, it is possible to study the corrosion of silicate to silicon carbide at high temperature by using two ( Ceramic-SiC ) and three ( Ceramic-SiO 2 -SiC ) layer structure model to simulate the corrosion of silicate to silicon carbide. The corrosion mechanism of SiC in PPR by silicate liquid during firing is revealed that the corrosion rate at its two sides (interfaces) determines the ultimate change in the thickness of the corrosion layer between the ceramic and the SiO 2 layer. Importantly, the corrosion layer thickness with time on the silicate-SiO 2 cross-section periodically presents wave-like changes, which can be attributed to the ionic migration between layers and the rate at which cations cross the corrosion layer when studying the three-layer model.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
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IF 8.4
Hui Chen,Xin Yang,Min Lin,Dongmiao Li,Bing Wang,Jinni Shen,Jinlin Long,Wenxin Dai,Xuxu Wang,Zizhong Zhang
Mimicking natural photosynthesis to convert CO2 and H2O into highly valuable solar fuels is one of the ideal ways to alleviate the energy shortage and environmental pollution. However, the low mobility of photogenerated holes and sluggish H2O oxidation half reaction seriously retard the reduction efficiency of CO2 by photocatalysis. In this paper, we reported that the visible light-active SiC photocatalyst was inserted into the InVO4 nanoflower framework to form the dual Z-scheme heterojunction composited photocatalyst. The composited photocatalysts can not only neutralize the low mobility of photogenerated holes on SiC but also improve the H2O oxidation on InVO4 nanoflowers. This leads to an effective conversion of CO2 to CO without sacrificial agents under visible light irradiation as well as a good separation of photogenerated charge carriers in the composited photocatalyst for the subsequent reaction. In comparison to the parent InVO4 and SiC, the optimum CO yields over InVO4/SiC were 9.41 and 11.54 times, respectively. Under 3 h visible light irradiation, the yields of CO reach up to 142.6 μmol·g–1 and stability of O2 release over InVO4/SiC. This research offers a practical approach to developing an efficient photocatalyst for the conversion of CO2 with H2O.
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2023
·Vol. 107
·期 2
·777-784
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IF 3.9
Shi-Kuan Sun,Jin-Hao Yuan,Wei-Ming Guo,Xiao-Ming Duan,De-Chang Jia,Hua-Tay Lin
This study aimed to investigate the effects of the original thickness on the densification, microstructure, and nanoindentation hardness of silicon carbide (SiC) ceramics prepared by the spark plasma sintering (SPS) process. The densification of SiC ceramics with different initial thicknesses ranging from 50 to 2000 µm was investigated in combination with varying SPS sintering temperature at 1700–1900°C. The results indicated that the densification of SiC sample with the initial thickness of 50 µm was complete after sintering at 1700°C. On the contrary, when the initial thickness exceeded 50 µm, it resulted in a porous microstructure. When the initial thickness varied from 50 to 100 µm, dense SiC monolithic could be obtained after sintering at 1800°C. All the samples were fully densified after sintering at 1900°C. The predominant factors for the thickness effect were mainly derived from the unique characteristics of SPS. The hardness of SiC ceramics was measured using nanoindentation, and it was found to have a strong correlation with the initial thickness, mainly attributed to the densification status. The dense SiC product demonstrated nanoindentation hardness with high values of ∼28.0 GPa.
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高影响因子
JOURNAL OF RARE EARTHS
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2021
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IF 3.712
Ye Zhang,Yong Gao,Peng Wang,Duo Na,Zhenming Yang,Jinsong Zhang
Extraction reactor is a major research area of interest within the field of rare earths extraction and separation. SiC foam offers excellent material characteristics as well as three-dimensional (3-D) reticulated structure; however, very little research has been carried out on its application in extraction reactor so far. In this work, a static mixer reactor based on SiC foam was designed and demonstrated to extract and separate Ce(III) and Pr(III) from nitric acid media by using 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester (P507) as extractant. The structure–performance relationship between SiC foam and extraction performance was studied by experiment combined with computational fluid dynamics (CFD) simulation. The experiment data are in good agreement with the simulation results. Contrast experiment by using a Kenics mixer was carried out, and SiC foam shows better extraction and mass transfer performance. Using the optimal structural SiC foam (pore size D = 2.3 mm, open porosity ε = 85%, foam length L = 80 mm), high extraction efficiency η (Pr(III): 94.6%, Ce(III): 88.5%) and separation factor β (2.27) between Ce(III) and Pr(III) is achieved at a high total throughput of 200 mL/min. Besides, overall volumetric mass transfer coefficient K L a of Pr(III) and Ce(III) are 0.519 and 0.378 s −1 at the residence time τ of 3.6 s, respectively, which reach the high level of microchannel reactors and are better than conventional extractors and other static mixers. SiC foam is found to be applicable as a static mixer for efficient and high-throughput extraction and separation of rare earths.
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高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Zhuoli Xu,Fuping Li,Yue Wang,Kang Zhao,Yufei Tang
In this work, ZrB 2 –ZrC–SiC composite nanofibers were prepared by electrospinning combined with the carbothermal reduction method. The morphology, phase composition, and oxidation resistance of the composite nanofibers were investigated. The results showed that ZrB 2 –ZrC–SiC composite nanofibers with good crystallinity were obtained after calcination at 1550 °C. The obtained fibers distributed uniformly, and the average diameter was about 375 nm. ZrB 2 –ZrC–SiC nanofibers were oxidized at 587 °C, which was higher than that of the ZrB 2 –ZrC nanofibers. It revealed that the addition of SiC could improve the oxidation resistance of ZrB 2 –ZrC composite nanofibers.
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高影响因子
Journal of Advanced Ceramics
·
2021
·Vol. 10
·期 6
·1371-1380
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IF 6.707
Lu Jun,Ni Dewei,Liao Chunjing,Zhou Haijun,Jiang Youlin,Chen Bowen,Zou Xuegang,Cai Feiyan,Ding Yusheng,Dong Shaoming
Fiber damage and uniform interphase preparation are the main challenges in conventional short fiber reinforced ceramic matrix composites. In this work, we develop a novel processing route in fabrication of short carbon fiber reinforced ZrB 2 -SiC composites (C sf /ZrB 2 -SiC) overcoming the above two issues. At first, C sf preforms with oriented designation and uniform PyC/SiC interphase are fabricated via direct ink writing (DIW) of short carbon fiber paste followed by chemical vapor infiltration. After that, ZrB 2 and SiC are introduced into the preforms by slurry impregnation and reactive melt infiltration, respectively. Microstructure evolution and optimization of the composites during fabrication are investigated in detail. The as-fabricated C sf /ZrB 2 -SiC composites have a bulk density of 2.47 g/cm 3 , with uniform weak interphase and without serious fiber damage. Consequently, non-brittle fracture occurs in the C sf /ZrB 2 -SiC composites with widespread toughening mechanisms such as crack deflection and bridging, interphase debonding, and fiber pull-out. This work provides a new opportunity to the material design and selection of short fiber reinforced composites.
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高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Qian Jiang,Yuling Xie,Lingqian Ji,Zhaoxiang Zhong,Weihong Xing
The fabrication of porous silicon carbide (SiC) ceramics prepared by existing reaction bonding technology requires high-temperature sintering beyond 1400 °C. We used low-cost industrial grade water glass and zirconia as sintering aids to prepare porous SiC ceramic filters to reduce the sintering temperature while improving the commerciality. Additionally, we investigated the effects of different sintering temperatures and the addition of water glass on the samples. Loading water glass and zirconia reduced the sintering temperature to 600 °C. The additive-loaded ceramic filter sintered at 600 °C exhibited an average pore size of 0.58 μm, a porosity of 47.4%, a bending strength reaching 56 MPa, a pure water permeance exceeding 4800 L m −2 h −1 bar −1 , and good acid corrosion resistance . In addition, the SiC filter prepared at 1000 °C showed good chemical resistance and an average pore size of 0.75 μm as well as mechanical strength and pure water permeance of over 80 MPa and 6294 L m −2 h −1 bar −1 , respectively. The low-cost, high-performance porous SiC ceramic filter exhibits broad commercial application prospects in water treatment.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Lingjie Li,Zhonghao Ning,Wenyan Huang,Liang Liao,Yinong Zheng,Kun Zhuang,Siqi Lan,Yinggan Zhang,Rongqian Yao
An ingenious strategy to prepare in-situ formed SiC(Al, rGO) bulk polymer-derived ceramics (PDCs) from re-pyrolyzing SiC(Al, rGO) p /polyaluminocarbosilane-vinyltriethoxysilane-graphene oxide (PACS-VTES-GO, PAVG) blends is highlighted. Flexible PAVG modified by Al with highly cross-linked structure effectively improves molecular weight and formability of precursors. Rigid SiC(Al, rGO) p fillers provide high mechanical properties owing to their unique microstructure which is consistent with SiC(Al, rGO) bulk PDCs. β-SiC nanocrystals are well dispersed in amorphous SiO x C y /C free , and rGO exhibits good compatibility with SiO x C y /C free . Besides, possible Al 2 O 3 is beneficial to relaxing thermal stress at β-SiC nanocrystalline boundaries. Interestingly, introduction of Al could avoid coarsening of β-SiC grains to enhance elevated temperature resistance. Furthermore, effect of re-pyrolysis temperature on the formation and microstructure of SiC(Al, rGO) bulk PDCs was also investigated. Particularly, lightweight samples re-pyrolyzed at 1300 °C display optimal fracture toughness (3.32 MPa m 1/2 ), compressive strength (177.16 MPa) and flexural strength (51.25 MPa), high ceramic yield (94.46%) and low linear shrinkage (4.38%), by far superior to those of most PDCs. As treated via precursor infiltration and pyrolysis (PIP) route and heated by butane gun flame in air, such products possess stable structures under elevated temperatures and have potential emerging uses in aerospace components.
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高影响因子
Journal of Advanced Ceramics
·
2021
·Vol. 10
·期 5
·1129-1139
·
IF 6.707
Wu Pengfei,Shi Benyang,Tu Huibin,Guo Changqing,Liu Anhua,Yan Guan,Yu Zhaoju
Severe volume expansion and inherently poor lithium ion transmission are two major problems of silicon anodes. To address these issues, we proposed a pomegranate-type Si/C composite anode with highly dispersed tiny silicon particles as the core assisted by small amount of SiC. Skillfully exploiting the high heat from magnesiothermic reduction, SiC can assist the good dispersion of silicon and provide good interface compatibility and chemical stability. The silicon anchored to the carbon shell provides multipoint contact mode, that together with the carbon shell frame, significantly promoting the transfer of dual charge. Besides, the pomegranate-type microcluster structure also improves the tap density of the electrode, reduces the direct contact area between active material and electrolyte, and enhances the electrochemical performance.
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高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Haitang Yang,Yanping Yang,Xueqiang Cao,Xiaozhong Huang,Yang Li
A Yb 2 SiO 5 /mullite/Si tri-layer environmental-barrier-coating (EBC) were coated on SiC f /SiC substrates via Air Plasma Spraying (APS). The thermal cycle tests (TCT) were conducted under thermal corrosive condition of vapor-oxygen (50 vol% H 2 O and 50 vol% O 2 ) with thermal shock from 1200 °C to 200 °C. Microstructures, weight loss and bonding strength of the samples were systemically investigated after 101, 396, 606 and 700 TCT cycles respectively. The results show that the corner of the tri-layer coating peel off from the sample with weight loss of 1.3% after 700 TCT cycles. The bonding strength between substrate and tri-layer coatings gradually decreases to 6.79 MPa (approximately 55.2% of virgin specimens) after 700 cycles due to thermal shock induced cracks distributed horizontally within Si layers and between Si layer and outer layers.
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高影响因子
Materials Today Communications
·
2020
·
IF 2.678
Jing He,Hua Wang,Qiqi Qu,Zheng Su,Tengfei Qin,Yunsheng Da,Xingyou Tian
Reduced graphene oxide (rGO) has been excellent three-dimensional network carries due to unique flexibility and high thermal conductivity. However, restricted by excellent electrical property of rGO, it remains blocking to fabricate high performance polymer composites applied in the electronic packaging field. In this work, a novel GO-assisted method was used to prepare different rGO@SiC structure as efficient heat pathways in polymer composites achieving desirable performance. The as-prepared epoxy composite, at a filler loading of 30 wt% and SiC particles of 600 nm, exhibited not only a high thermal conductivity (1.02 W/mK) but also the lowest electrical conductivity (1.18 × 10 −12 S/cm). An effective medium theory model (EMT) was constructed to perfectly predict the thermal conductivity of the composites and precisely calculate the interfacial thermal resistance. The research provides a creative insight to the design of rGO structure and high-performance composites with a bright application prospect in advanced thermal managing materials.
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高影响因子
危险品化学品经营许可证（带存储）