CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Mingzheng Zhu,Sizhe Xue,Jixiang Zhu,Muhammad Riaz Ahmad,Jian-Guo Dai
Geopolymer concrete has emerged as a promising eco-friendly alternative to conventional cementitious materials, particularly for sustainable underwater engineering applications. However, its inherent brittleness limits its broader use in such environments. To address this challenge, this study developed and evaluated an innovative underwater ultra-high-performance geopolymer concrete (U-UHPGC). The effects of varying water-to-precursor (w/p) ratios (0.33, 0.30, and 0.27) and two fly ash (FA) to ground granulated blast furnace slag (GGBFS) ratios (5:5 and 2:8) on the anti-washout resistance, rheological behavior, mechanical performance, and microstructural characteristics of U-UHPGC were systematically investigated. The results revealed that lower w/p ratios and higher GGBFS contents significantly enhanced the yield stress and plastic viscosity of the paste, thereby improving its resistance to washout in underwater conditions. Furthermore, the optimized mix design achieved compressive and flexural strengths of up to 81.84 MPa and 12.83 MPa, respectively, alongside excellent flexural deformation capacity. Microstructural analysis demonstrated that reduced w/p ratios and increased GGBFS content led to a denser matrix, promoting stronger interfacial bonding between polypropylene fibers and the matrix. This enhanced bonding allowed the fibers to effectively bridge and arrest cracks. As a key environmental advantage, the U-UHPGC formulation embodies a substantial reduction approximately 40 % in both energy demand and carbon footprint over traditional U-UHPC. These findings contribute valuable insights for the advancement of high-performance geopolymer concretes tailored for durable and sustainable marine infrastructure.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2026
·
IF 6.3
Qirui Pang,Huibin Tu,Hao Xue,Tianliang Zhou,Shuxing Li,Rong-Jun Xie
YAG:Ce-Al 2 O 3 composite phosphor ceramics exhibit exceptional thermal and optical properties, demonstrating remarkable resistance to high-power laser excitation and highly promising for laser-driven solid-state lighting. However, due to limitations in understanding the effects of raw materials, fabricating densely structured and homogeneously distributed composite ceramics via tape casting remains a significant challenge. In this study, we investigated effects of particle size and content of raw powders on rheological properties of slurry, microstructure and optical properties of composite phosphor ceramics. The YAG:Ce-70 wt% Al 2 O 3 composite phosphor ceramic, prepared by using nano-sized Y 2 O 3 and Al 2 O 3 , showed fully densified and homogeneous microstructure and demonstrated optimal optical properties. Under excitation at a blue laser power density of 21.20 W·mm -2 , the YAG:Ce-70 wt% Al 2 O 3 ceramic with a thickness of 0.2 mm created white light with a luminous flux of 1496.05 lm and 141.14 lm·W -1 . This work paves an avenue to large-scale production of high-performance phosphor ceramics.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Ju He,Tianrun Ma,Bohua Duan,Dezhi Wang,Zhuangzhi Wu,xinli Liu
Ti(C,N)-based cermets are widely used in cutting tools and high-temperature structural components, but their application is limited by difficulties in fabricating large and complex-shaped parts. In this study, Ti(C,N)-based cermets were prepared via gel-cast using a CoCrCuFeNi high-entropy alloy (HEA) as the binder. The effects of solid loading on slurry stability and green body formation, as well as the influence of sintering temperature on microstructure and mechanical properties, were investigated. The results show that stable slurry and uniform green bodies were obtained at a solid loading of 55 vol%. With increasing sintering temperature, densification and mechanical properties improved concurrently, while the fracture mechanism transitioned from intergranular fracture to matrix tearing. The Ti(C,N)-based cermet sintered at 1550 °C for 60 min exhibited excellent properties, with a relative density of 96.42%, hardness of 1665.67 HV30, bending strength of 671.75 MPa, and fracture toughness of 6.44 MPa m 1/2 , comparable to conventional Ti(C,N)-Ni cermets. These results demonstrate that gel-cast with a HEA binder is a promising approach for fabricating large, complex-shaped Ti(C,N)-based cermets.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yang Cui,Hongda Xu,Liming He,Ruifen Guo,Quan Jin,Xiaolong Wang
In this paper, layered porous SiC scaffolds were prepared by freeze casting and sintering, and then followed by loading polypyrrole (PPy) on its surface by in-situ polymerization to obtain porous SiC/PPy composites with different PPy content. The loaded PPy forms a good three-dimensional (3D) conductive network, thus the electrical conductivity and the dielectric loss capability of the sample is improved. Moreover, the porous structure provides more SiC-PPy heterogeneous interfaces for charge accumulation, leading to interfacial polarization and relaxation, further enhancing the microwave absorption performance. Compared with pure SiC particles, SiC/PPy-25 shows an increase in the minimum reflection loss (RL) from −8.64 to −39.1 dB, effective absorption bandwidth (RL < −10 dB) of 4.72 GHz, and comparatively thinner matched thickness of 1.7 mm. We provide a microwave absorption material with simple synthesis, high efficiency and wide application prospect.
研究领域:
材料科学
·
电磁学
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高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Zhang Wang,Peizhong Feng,Xiaohong Wang,Peng Geng,Farid Akhtar,Haifei Zhang
Hierarchically porous mullite foams were fabricated from coal-series kaolin and Al 2 O 3 slurries by freeze-casting using tert-butyl alcohol (TBA) and water as templates. TBA developed unidirectionally aligned pore channels along the freezing direction and water developed lamellar pores. The total porosity (60.2–83.4%), density (0.49–1.23 g/cm 3 ) and macro-pore size (10–50 µm) of mullite foams were tailored by controlling the solid content of the slurries. The mullitization reaction was completed at the sintering temperature of 1500 °C. The compressive strength of mullite foams along the freezing direction was 3.8–49.4 MPa. Lower porosity and higher compressive strength of sintered mullite foams were obtained using TBA as solvent compared to water. The thermal conductivity of low density and mechanically stable TBA templated porous mullite with 80.2% porosity was 0.18 W/m K, indicting that the freeze-cast porous mullite was a promising refractory material for applications in thermal insulation .
研究领域:
材料科学
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陶瓷
·
热工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Yang Wang,Qiang Liu,Biao Zhang,Haoqian Zhang,Yicheng Jin,Zhaoxin Zhong,Feng Ye,Wen Wang
The architectures of porous B 4 C scaffolds play a pivotal role in the performance of their infiltrated composites for multiple applications. Here, we use gelation-freeze-drying approach to creating the porous B 4 C scaffolds with oriented channels, which are promising and relatively untested freeze-cast constructs. Addition of gelatin alters not only the porosity and shrinkage but also the pore size and morphology of the scaffolds. Specifically, as gelatin contents increase from 0 to 5 wt%, the porosity, closed porosity, and volume shrinkage range from 74.53 to 73.27%, 0.28–0.65% and 1.95–3.96%, respectively; the increased wavelength and lamellar thickness can be attributed to the enhancement in viscosity. Importantly, raised gelatin contents lead to the reduced pore aspect ratio triggering the transformation from lamellae with a high aspect ratio to ellipse shaped morphologies that contribute to the improved compressive strength ranging from 0.7 to 4.4 MPa. The freeze-cast B 4 C scaffolds with tailored performance by varying gelatin contents widen the application scopes of bioinspired composites.
研究领域:
材料科学
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生物医学工程
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DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2019
·
IF 3.42
Xuelin Huang,Liang Yu,Yinsheng Dong
In this paper, a multiple hybrid coating (MHC) with good corrosion resistance and superhydrophobic property on the surface of cast Al–Si alloy was synthesized via a simple dip-coating method by using organosiloxane containing hydrophobic mullite-SiO 2 (M–S) particles as a precursor. The morphology, composition and water contact angle (WCA) of the coatings were investigated by SEM, FT-IR, XRD and OSA100, respectively. The results showed that the hydrophobic M–S particles was synthesized through modified Stöber method, which has a micro- and nano- scale structures. In addition, the morphology of the MHC presented that a dense and uniformly cover on the Al–Si alloy substrate formed a superhydrophobic surface with the WCA ∼153.4°. The corrosion protection of MHC was evaluated by using the Tafel polarization curves and electrochemical impedance spectroscopy. The coating with M–S particles exhibited much better corrosion resistance property than that of the untreated substrate and pure organosiloxane coating (OSC). The E corr was obviously more positive than that of them. Moreover, the corrosion current density of MHC was remarkably decreased by 5 and 3 orders of magnitude compared with other two coatings, respectively. The corrosion resistance of the MHC decreased gradually with increasing immersing time. However, the R ct value of MHC was still 2.31 × 10 6 Ω cm 2 after 168 h immersion testing in 0.6 M NaCl solution, which was nearly 322-fold higher than that of untreated substrate. Owing to the excellent superhydrophobic, corrosion resistance and long-term stability, the MHC possesses potential application in corrosion resistance of cast Al–Si alloy.
研究领域:
材料科学
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表面工程
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腐蚀科学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 25
·13989-14000
·
IF 4.22
Wang Yang,Liu Qiang,Zhang Biao,Zhang Haoqian,Jin Yicheng,Zhong Zhaoxin,Ye Feng,Wang Wen
Freeze casting technique has become a promising way to assemble various components into multifunctional nacre-like materials. Surprisingly, although many ceramics materials have been processed by this approach, there are few studies reporting the structure–property-processing relationships of freeze-cast porous B 4 C ceramics. Here we generate bimodally lamellar porous B 4 C scaffolds by freeze casting and describe how processing parameters such as solid concentration and freezing front velocity control the architecture. The porosity, pore morphology and lamella thickness of B 4 C scaffolds can be tailored via altering such two parameters, which makes the scaffolds with excellent mechanical properties suitable as a support for the melt infiltration process. The pore morphology, structural characteristics, compressive mechanical response and fracture mechanism of the scaffolds are explored. Additionally, we have utilized a morphology map to identify the different structures such as lamellar and dendritic, which are formed by varying processing parameters. This study offers the freeze-cast scaffolds with custom-designed structure and mechanical properties for developing bioinspired multifunctional materials represented by B 4 C/Al composites.
研究领域:
材料科学
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生物医学工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Hanqin Liang,Kaihui Zuo,Yongfeng Xia,Dongxu Yao,Jinwei Yin,Yuping Zeng
Lu-Al-Si-O-N tapes with different thickness were used to join gas pressure sintered Si 3 N 4 ceramics. The microstructure of the joints and the influences of the joint thickness and joining temperature on the bonding strength of the as-joined Si 3 N 4 ceramics have been investigated. The highest bonding strength about ~ 300 MPa of the joined specimens was achieved by using 450 µm interlayer at 1450 °C. The existence of Si 3 N 4 nanowires was beneficial for the improvement of the bonding strength by interweaving the oxynitride glass matrix in the joint region.
研究领域:
材料科学
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陶瓷工程
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高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2021
·Vol. 27
·期 37
·9654-9660
·
IF 5.236
Lichao Wang,Lian Xu,Bingmei Su,Wei Lin,Xinqi Xu,Juan Lin
Graphical CASTing call : A semi-rational combinatorial active-site saturation test (CAST) was performed to improve the C β stereoselectivity of threonine aldolase. MD simulations suggested that the Y314R variant could interact with 4-methylsulfonyl benzaldehyde through hydrogen bonding to control the direction of entry of substrate, this increased the de value from 58 to 81 %. l -Threonine aldolase from Actinocorallia herbida ( Ah LTA) is an ideal catalyst for producing l - threo -4-methylsulfonylphenylserine [(2 S ,3 R )- 1 b ], a key chiral precursor for florfenicol and thiamphenicol. The moderate C β stereoselectivity is the main obstacle to the industrial application of Ah LTA. To address this issue, a combinatorial active-site saturation test (CAST) together with sequence conservatism analysis was applied to engineer the Ah LTA toward improved C β stereoselectivity. The optical mutant Y314R could asymmetrically synthesize l - threo -4-methylsulfonylphenylserine with 81 % diastereomeric excess ( de ), which is 23 % higher than wild-type Ah LTA. Molecular dynamic (MD) simulations revealed that the mechanism for the improvement in C β stereoselectivity of Y314R is due to the acylamino group of residues Arg314 controlling the orientation of substrate 4-methylsulfonyl benzaldehyde ( 1 a ) in the active pocket by directed interaction with the methylsulfonyl group; this leads to asymmetric synthesis of l - threo -4-methylsulfonylphenylserine. The success in this study demonstrates that direct control of substrates in an active pocket is an attract strategy to address the C β stereoselectivity problem of LTA and contribute to the industrial application of LTA.
研究领域:
生物催化
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酶工程
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分子生物学
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化学合成
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DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Jing Wang,Tong Zheng,Huiling Liu,Gang Wang,Yanxiang Zhang,Chen Cai
In this study, the electrochemical generation of ferrate (Fe(VI)) from grey cast iron anode in sodium hydroxide (NaOH) solution was utilized in situ to degrade the malodorous pollutant of ethanethiol (C 2 H 5 SH). During electrolysis, C 2 H 5 SH was oxidized by the combination of direct anodic oxidation and Fe(VI) oxidation (indirect oxidation). The direct anodic oxidation process, which played an important role in the decontamination process but was often disregarded in related studies, was investigated in detail. The electrochemical generation of Fe(VI) was investigated, and the maximum current efficiency of Fe(VI) generation was obtained in 14 M NaOH solution. The voltammetry studies of the grey cast iron anode in NaOH solutions containing and without C 2 H 5 SH revealed that the dissolution of anode was improved in the presence of C 2 H 5 SH. A decrease in NaOH concentration increased the contribution of direct anodic oxidation but decreased the electrochemical generation of Fe(VI). C 2 H 5 SH was degraded on the grey cast iron anode at a higher rate in less concentrated NaOH solution ( k = 4.15 × 10 −2 min −1 in 2 M NaOH solution), which could be ascribed to the enhancement in direct anodic oxidation as well as in the oxidizing power of Fe(VI). Higher current density promoted the degradation rate of C 2 H 5 SH in both direct and indirect oxidation processes, but it also decreased the current efficiency due to the improvement of the side reactions. Additionally, the in-situ and on-line applications of the electrochemical generated Fe(VI) in recent studies were presented and discussed. This study provides a comprehensive understanding of C 2 H 5 SH oxidation on grey cast iron anode, and offers a feasible electrochemical scrubbing approach using grey cast iron as the anode for C 2 H 5 SH odors control.
研究领域:
环境科学
·
电化学工程
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DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2020
·Vol. 22
·期 11
·2000519
·
IF 3.217
Chuan Zong Wu,Zhu Yin Chen,Xinli Liu,Ting Shen,LiGuo Zu,Lei Zhang
Porous titanium scaffolds with high porosity and connected macropores are fabricated by adding zirconium acetate to control the ice crystal growth during freeze casting. The influences of zirconium acetate additives on the phase composition, pore structure, and mechanical properties of porous titanium are studied. As modified by zirconium acetate, the X-ray diffraction peaks of titanium moves to a smaller angle, and the zirconium is evenly distributed on the titanium matrix. With the increase in the concentration of zirconium from 0 to 60 g L −1 , the pore morphology of porous titanium changes from typical lamellar to the honeycomb, the pore size distribution becomes wider. The average pore size and porosity increases from 44 ± 11 to 126 ± 35 μm and from 46.4 ± 1.3 to 59.1 ± 1.3%, respectively. As the concentration of zirconium acetate is 40 g L −1 , the porosity and the pore size of the porous titanium scaffolds are comparable with those modified by 10 g L −1 zirconium acetate, but the compressive strength is 2.3 times higher. Zirconium acetate as an additive has an excellent performance in optimizing the pore structure and mechanical properties of water-based freeze-cast porous titanium.
研究领域:
生物材料学
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组织工程
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金属材料科学
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医用植入材料
·
多孔材料
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DOI
高影响因子
危险品化学品经营许可证（带存储）