CRYSTAL GROWTH & DESIGN
·
2022
·
IF 4.01
Chuqi Wang,Bo Jiang,Yulin Qin,Bo Peng,Yue Tang,Shixue Guan,Junpu Wang,Mengxi Zhao,Lu Zhang,Zili Kou
A highly amorphous Fe70Ti2Y6B22 bulk alloy, with a diameter of 3 mm and a height of 2 mm, was synthesized by applying isothermal compression from 10 to 15 GPa at 1473 K using mixed metal powder. The structural analyses by performing X-ray diffraction and transmission electron microscopy revealed that the alloy was composed of a glassy structure. According to the differential scanning calorimetry analysis, a large supercooled liquid region (ΔTx) of approximately 550 K was obtained, which is caused by the highly densely packed structures of a highly amorphous Fe70Ti2Y6B22 bulk alloy. The value was six times the value obtained by rapid cooling. Also, the Vickers hardness of the sample was approximately 8.5 GPa at a loading force of 29.4 N. These results indicated that isothermal compression under high pressure is a feasible method for fabricating bulk metallic glasses satisfying large-size requirements.
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高影响因子
Small Science
·
2022
·Vol. 2
·期 7
·2200018
·
IF 0
Yajun Zhang,Long Pan,Peigen Zhang,ZhengMing Sun
High-performance electromagnetic (EM) absorbing materials are in urgent need due to severe EM pollution caused by fast development of communication technology and electronic devices. Gradient structure benefits EM absorbing performance. However, the relevant study is very limited, and the relationship between component layers and overall performance is unclear. Herein, a gradient structure containing impedance matching layer, lossy layer, and reflective layer is built via repeated casting-drying method using Ti 3 C 2 T x MXene and polyvinyl alcohol. With optimized gradient structure, the minimum reflection loss (RL) reaches −74.8 dB with effective absorbing bandwidth (EAB) covering the whole X-band. The good absorbing performance is ascribed to the good impedance matching, which is derived from the stepwisely increased permittivity of each layer. Moreover, it is found that RL reaches the lowest value when lossy layer permittivity is close to the average permittivity of impedance matching layer and reflective layer. In addition, the decrease of lossy layer permittivity causes the decrease of total thickness of the gradient structure. This work demonstrates the effectiveness of gradient structure toward strong and broadband microwave absorption and provides rules for designing proper gradient structures to satisfy different requirements.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Jia-Yan Pu,Xiu-Tong Wang,Jing-Quan Liu,Mei-Peng Ren,You-Bo Nan,Mao-Sheng Liu,Hui Xu,Li-Hui Yang,Yan-Liang Huang,Bao-Rong Hou
Polydopamine (PDA) coating was prepared on TiO 2 nanotubes array by dip-coating method to improve the photocathodic protection performance of TiO 2 . The morphology, crystal structure, valence state and elemental composition of the PDA@TiO 2 were characterized. The electrochemical tests of open-circuit potential (OCP) and photocurrent density curves were used to characterize their photocathodic protection effects for 304 stainless steels (304SS). The result shows that the TiO 2 combined with PDA can effectively prevent the corrosion of 304SS under visible light irradiation. Moreover, through stability test and immersion test, the sample has good stability and it also has protective effect for 304SS in the dark state.
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高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 6
·2101510
·
IF 6.389
Jun Li,Tongtong Xu,Han Bai,Zhenyu Shen,Yanyan Huang,Wenwen Xing,Zhongxiang Zhou
Microwave absorption enhancements through atomic doping in traditional materials remain a significant challenge. Herein, the MAX phase materials of Fe-doped Ti 3 AlC 2 ( x Fe-Ti 3 AlC 2 , abbreviated as TFAC- x , x = 0, 0.2, 0.3, 0.4) are synthesized via solid-phase reaction method. The X-ray diffraction, Raman, and scanning electron microscopy confirm that the TFAC- x samples are of high quality with multiphase coexistence structure and abundant interfaces. Relying on the improved impedance matching originating from structural modulation, the synergistic effects of dielectric loss and magnetic loss, as well as the enhanced interfacial polarization and defect dipole polarization, both the microwave absorption intensity and bandwidth are greatly strengthened. Accordingly, the minimum reflection loss of TFAC-3 sample can achieve -33.3 dB and the absorption bandwidth could reach 3.9 GHz with the thickness of only 1.5 mm. Moreover, the investigated frequency can cover 86% through regulating their thickness from 1.5 to 5 mm, showing the excellent frequency modulation effect. The revealed improvements in both the microwave absorption performance and properties of TFAC- x may enlighten the designing of microwave absorption materials and have potentials for widespread applications.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Wei Zhou,Minghe Cao,Hongye Wang,Hua Hao,Zhonghua Yao,Hanxing Liu
The miniaturization of electronic components requires materials with colossal permittivity. In this work, titanium-powder-doped TiO 2 ceramics with colossal permittivity and a low dielectric loss over a wide range of frequency and temperature were successfully prepared using a solid-state reaction in an Ar atmosphere. TiO 2 ceramics with 2% Ti powder doping had the highest permittivity (110,000) and the lowest dielectric loss (0.029) at 1 kHz and room temperature. Systematic defect analysis showed that Ti 4+ was successfully reduced to Ti 3+ through doping with Ti metal powder. Further, oxygen vacancies were created in the high-temperature inert atmosphere, which promoted the formation of defect clusters with T i 3 + − V o ″ − T i 3 + as the core. Polarization and local confinement of the defect clusters resulted in the colossal permittivity and low dielectric loss. Therefore, this work provides necessary information and novel ideas for the design of correlated defects in colossal permittivity materials.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Jinsu Yu,Hsinshen Ho,Jiangyi Chen
As a transmission part, the service life of the shaft parts directly affects the machining efficiency and economic benefit, and requires higher surface hardness and wear resistance. In this study, the Ti/B 4 C/dr40 composite powder was cladded on the shaft part surface via laser cladding to improve the microhardness and wear resistance. The microstructure evolution and phase structure were analyzed to reveal the strengthening mechanism of Ti and B 4 C on dr40 coating. The Ti/B 4 C/dr40 composite coating with low defects and good interface metallurgical bonding quality between coating and substrate was prepared on the 45# steel shaft part. The results show that the main phase in the Ti/B 4 C/dr40 composite coating is TiC, TiB 2 , Cr 2 C 3 , (Ti, Cr) C, (Ti, Cr, Fe, Ni) (C, B). With the addition content of Ti increasing, the grain densifies, the sieve-reticular structure and small strip phase at grain boundary and intergranular area change as massive phase. Moreover, the microhardness improves up to 2.05 times than that of dr40 coating. The in-situ synthesis of carbides and borides are evenly distributed in the coating, which improves the deformation resistance of the coating. In addition, the precipitation and solid solution strengthening caused by reinforcement phase also enhanced matrix strength for supporting reinforcement phases, improving the coating wear resistance.
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高影响因子
POWDER METALLURGY
·
2022
·
IF 2.228
Ying Zhang,Meng Xiao,Yi-min Zhou,Yi-fu Shen
The eutectic FeNiCoCrTi0.6Nb0.4 high-entropy alloy coating (HEAC) is annealed in Argon at 450°C, 850°C and 1050°C to investigate the thermal stability. The results show that annealed coatings are all composed of BCC solid solution and Laves phase with no production of new phases. The fine eutectic cells can be maintained at a higher temperature in that continuous intracellular coarsening does not occur until annealing at 1050°C. With the increase of annealing temperature, the microhardness and wear resistance of FeNiCoCrTi0.6Nb0.4 coating increase first and then decrease slightly. Especially, the microhardness of FeNiCoCrTi0.6Nb0.4 annealed at 1050°C is only 6.03% lower than that of unannealed one, and the wear rate is only 10.70% higher than that of unannealed one, which strongly indicates that eutectic FeNiCoCrTi0.6Nb0.4 HEAC has excellent thermal stability and can be well applied in high-temperature environments.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xinwei Geng,Yongfeng Xia,Hanqin Liang,Dongxu Yao,Yu-Ping Zeng
Magnéli phases are an important class of transition metal oxides widely utilized in fields such as batteries, electrocatalysis , and photocatalysis . However, there are no reports on the use of Magnéli phases as additives in ceramic sintering. In order to explore the impact of the Magnéli phase as an additive on the sintering process, self-made Magnéli phase Ti 4 O 7 powder was added to the graded mixture of titanium dioxide (TiO 2 ) coarse powder and nanopowder , and sintered under atmospheric conditions in this study. The sintering characteristics, microstructure, and mechanical properties of TiO 2 ceramics with different content of Ti 4 O 7 were characterized. The results revealed that the addition of Ti 4 O 7 contributed to the reduction of the densification temperature of TiO 2 ceramics. Compared to the undoped sample, the addition of 1 wt% Ti 4 O 7 powder significantly improved the flexural strength and Vickers hardness of TiO 2 ceramics by 13.5% and 24.8%. According to the results of thermal analysis, UV–Vis–NIR, and XPS, the mechanism of Ti 4 O 7 in the sintering process of TiO 2 ceramics under atmospheric conditions was systematically discussed. This work not only obtained TiO 2 ceramics with improved performance but also showed the tremendous potential of Magnéli phases in the field of ceramic sintering.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 42
·2305965
·
IF 19
Xinfeng Tang,Yanhua Zhu,Delong Duan,Xingwu Zhai,Yujian Xia,Tao Xu,Qian Liu,Hui Zhang,Min Zhou
Due to the deep biological penetrability and therapeutic depth, the photothermal therapy over second near-infrared region (NIR-II) is booming against deep-seated tumors. Intensive endeavors are committed to looking for suitable photothermal agents (PTAs), but the progress seems not so satisfied toward the choice of PTA dosage. Herein, a comprehensive parameter, incident photon-to-thermal conversion coefficient (IPTCE), is used to evaluate the overall conversion of PTAs at different dosage, which will benefit for determining the optimized dosage of PTAs in pursuit of complete healing together with reduced long-term damages of nanodrugs. To prove the possibility, a series of anionic solid solution MXenes are chosen as hosts due to their versatile chemical compositions and correspondingly tunable light response. By deconvoluting fundamental structure–composition–property relationships, anionic regulation with extra electron injection leads to tunable free carrier densities and enhanced NIR-II harvesting. Ti 3 C 1.23 N 0.77 with high-level nitrogen exhibits extraordinary extinction coefficient (43.5 L g −1 cm −1 ) than other MXenes. The parameter of IPTCE can guide the choice of PTA concentration for complete photothermal healing in vitro and vivo. This proof-of-principle demonstration highlights synthetically tailoring of the light harvesting over NIR-II biowindow for a given host material by anionic regulation and further optimizes tumor photothermal therapy at low dose.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yang Li,Yuchang Qing,Haoyang Yao,Hailong Xu,Hongjing Wu
High-performance microwave absorption coatings are critically required in the stealth defense system of military platforms. Regrettably, just optimizing the property but neglecting the application feasibility seriously inhibits its practical application in the field of microwave absorption. To face this challenge, the Ti 4 O 7 /carbon nanotubes (CNTs)/Al 2 O 3 coatings were successfully fabricated by a plasma-sprayed method. For the different oxygen vacancy-induced Ti 4 O 7 coatings, the enhanced ε' and ε'' values in the frequency of X-band is due to the synergistic manipulation of conductive path, defects and interfacial polarization. The optimal reflection loss of Ti 4 O 7 /CNTs/Al 2 O 3 sample (0 wt% CNTs) is −55.7 dB (8.9 GHz of 2.41 mm), while the electromagnetic interference shielding effectiveness of Ti 4 O 7 /CNTs/Al 2 O 3 sample (5 wt% CNTs) increases to 20.5 dB as the enhanced electrical conductivity. In special, the flexural strength of Ti 4 O 7 /CNTs/Al 2 O 3 coatings first increases from 48.59 MPa (0 wt% CNTs) to 67.13 MPa (2.5 wt% CNTs) and then decreases to 38.31 MPa (5 wt% CNTs), demonstrating that an appropriate amount of CNTs evenly dispersed in the Ti 4 O 7 /Al 2 O 3 ceramic matrix can effectively play the role of CNTs as the strengthening phase of the coatings. This research will provide a strategy by tailoring synergistic effect of dielectric loss and conduction loss for oxygen vacancy-mediated Ti 4 O 7 material to broaden the application of absorbing or shielding ceramic coatings.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Wei Luo,Yi Liu,Chuangye Wang,Dan Zhao,Xiaoyan Yuan,Jianfeng Zhu,Lei Wang,Shouwu Guo
The morphology of MAX phase powders significantly influences their microwave absorption properties. However, the traditional synthesis via solid-state reactions produces irregular powders, and the preparation of MAX phase powders with specific morphology remains a challenge. Herein, (V 0.8 Ti 0.1 Cr 0.1 ) 2 AlC MAX phase microrods were fabricated for the first time in NaCl/KCl molten salts using vanadium, titanium, chromium, aluminum , and short carbon fibers as precursors. It was found that despite acting as a carbon source, carbon fibers also acted as sacrificial templates. By adjusting the molar ratio of metal powders and short carbon fibers, a series of carbon fiber@(V 0.8 Ti 0.1 Cr 0.1 ) 2 AlC microrods with core-sheath structure were also obtained. Carbon fiber@(V 0.8 Ti 0.1 Cr 0.1 ) 2 AlC microrods with a molar ratio of 8:2 showed the optimum microwave absorption performance. The reflection loss (RL) value reached up to –63.26 dB at 2.40 mm, and the effective absorption bandwidth (EAB) was about 5.28 GHz with a thickness of 2.02 mm. Based on the electromagnetic parameter analysis and theoretical simulation, the enhanced microwave absorption performance was attributed to the synergistic effect of different factors like dielectric loss, magnetic loss, multiple reflection, and scattering. This work offers a facile route to modulate the morphology of MAX phase powders and may accelerate its application as microwave absorbers.
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高影响因子
Energy Technology
·
2023
·Vol. 12
·期 3
·2300736
·
IF 3.8
Peilong Zhou,Xinwei Geng,Dongxu Yao,Yongfeng Xia,Yu-Ping Zeng
Traditional carbon materials suffer from weak adsorption of lithium polysulfides and excessive consumption of electrolyte. A simple and feasible molten salt method is applied for constructing an active nanocrystalline TiC shell on the surface of porous carbon. The highly active TiC nanoshells endow the core–shell composite with efficient chemical–physical synergistic adsorption, which can effectively confine and convert polysulfides, thereby improving the electrochemical performance of lithium–sulfur batteries. The lithium–sulfur batteries assembled with modified separator deliver a high initial discharge specific capacity of 1396 mAh g −1 at a discharge rate of 0.5 C and a high capacity retention of 747.1 mAh g −1 after 500 cycles, with a high coulombic efficiency of 98% during cycling. Besides, this molten salt method can be applied to modify the porous carbon materials of various composite sulfur cathodes such as graphene, carbon nanotubes, and 3D nonwoven carbon fabrics.
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