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| 1 | Mechanical and dielectric properties of porous and wave-transparent Si3N4–Si3N4 composite ceramics fabricated by 3D printing combined with chemical vapor infiltration显示文摘Porous Si3N4–Si3N4 composite ceramics were fabricated by 3D printing combined with low-pressure chemical vapor infiltration(CVI).This technique could effectively improve the designability of porous Si3N4 ceramics and optimize the mechanical and dielectric properties.The effects of process parameters including the deposition time and heat treatment on the microstructure and properties of porous Si3N4–Si3N4 composite ceramics were studied.The study highlights following:When CVI processing time was increased from 0 to 12 h,the porosity decreased from68.65%to 26.07%and the density increased from 0.99 to 2.02 g/cm3.At the same time,the dielectric constant gradually increased from 1.72 to 3.60;however,the dielectric loss always remained less than0.01,indicating the excellent electromagnetic(EM)wave-transparent performance of porous Si3N4–Si3N4 composite ceramics.The maximum flexural strength of 47±2 MPa was achieved when the deposition time attained 6 h.After heat treatment,the porosity increased from 26.07%to 36.02%and the dielectric constant got a slight increase from 3.60 to 3.70 with the dielectric loss still maintaining lower than 0.01.It has been demonstrated that the porous Si3N4–Si3N4 composite ceramics are a promising structural and EM wave-transparent material suitable for high temperature service. | Zanlin CHENG Fang YE Yongsheng LIU Tianlu QIAO Jianping LI Hailong QIN Laifei CHENG Litong ZHANG | 2019 | Journal of Advanced Ceramics2019，8，3： | 10 |
| 2 | Dielectric and Electromagnetic Wave Absorbing Properties of Two Types of SiC Fibres with Different Compositions显示文摘The dielectric and electromagnetic properties of two types of SiC fibres with different compositions were investigated. The permittivity and electromagnetic shielding effectiveness (SE) of SiC fibre bundles were measured in 8.2-12.4 GHz by waveguide method. The reflection coefficient (RC) of unidirectional SiC fibre laminates was determined in 8-18 GHz using naval research laboratory (NRL)-arc method. Results showed that the electromagnetic wave (EMW) absorbing properties of SiC fibres were correlated with their composition, microstructure and instinct performance of electrical resistance. SiC fibres with higher content and greater size of nano-scale β-SiC showed higher permittivity, conductivity, SE and lower RC, which resulted in their better EMW absorbing ability, i.e. the lower reflection to EMW. | Fang Ye Litong Zhang Xiaowei Yin Yongsheng Liu Laifei Cheng | 2013 | Journal of Materials Science & Technology2013，29，1： | 7 |
| 3 | Corrigendum to“Single-atomcatalysts for CO oxidation,CO reduction,andOelectrochemistry”[J.Energy Chem.65(2022)254-279]显示文摘 | Wenyu Yuan Yiyuan Ma Heng Wu Laifei Cheng | 2022 | Journal of Energy Chemistry2022，31，6： | 4 |
| 4 | 3D-printed controllable gradient pore superwetting structures for high temperature efficient oil-water separation显示文摘Superwetting surfaces have the potential to address oil pollution in water,through their ability to separate the two.However,it remains a great challenge to fabricate stable and efficient separation structures using conventional manufacturing techniques.Furthermore,the materials traditionally used for oil-water separation are not stable at high temperature.Therefore,there is a need to develop stable,customizable structures to improve the performance of oil-water separation devices.In recent years,3D printing technology has developed rapidly,and breakthroughs have been made in the fabrication of complicated ceramic structures using this technology.Here,a ceramic material with a gradient pore structure and superhydrophobic/superoleophilic properties was prepared using 3D printing for high-efficiency oil-water separation.The gradient pore structure developed here can support a flux of up to 25434 L/m^(2)h,which is nearly 40%higher than that an analogous structure with straight pores.At 200℃,the oil-water separation performance was maintained at 97.4%.Furthermore,samples of the material exhibited outstanding mechanical properties,and chemical stability in a variety of harsh environments.This study provides an efficient,simple,and reliable method for manufacturing oil-water separation materials using 3D printing,and may have broader implications for both fundamental research and industrial applications. | Zhipeng Jin Hui Mei Yuekai Yan Longkai Pan Hongxia Liu Shanshan Xiao Laifei Cheng | 2021 | Journal of Materiomics2021，7，1： | 4 |
| 5 | Enhanced mechanical property and tunable dielectric property of SiC_(f)/SiC-SiBCN composites by CVI combined with PIP显示文摘The SiBCN matrix via chemical vapor infiltration(CVI)or/and polymer infiltration pyrolysis(PIP)technologies was orderly introduced to SiC_(f)/SiC composites to optimize the mechanical property and electromagnetic(EM)shielding effectiveness simultaneously.The BN interface with the thickness of 350 nm was designed to obtain a little stronger interface bonding.The flexural strength of SiC_(f)/SiC-SiBCN composites reached 545.45±29.59 MPa thanks to the crack deflection between the CVI SiC and CVI SiBCN,as well as CVI SiBCN and PIP SiBCN matrix because of the modulus difference between them.The fracture toughness(KiC)with the value of 16.02±0.94 MPa·m^(1/2) was obtained owing to the extension of crack propagation path.The adverse effect of stronger interface bonding was eliminated by the design of matrix microstructure for SiC_(f)/SiC-SiBCN composites.The thermal conductivity in the thickness direction was 7.64 W·(m·K)^(-1) at 1200℃and the electric resistivity decreased to 1.53×10^(3) Ω·m.The tunable dielectric property was obtained with the coordination of wave-absorption CVI SiBCN matrix and impedance matching PIP SiBCN matrix,and the total shielding effectiveness(SE_(T))attained 30.01 dB.It indicates that the SiC_(f)/SiC-SiBCN composites have great potential to be applied as structural and functional materials. | Chaokun SONG Yongsheng LIU Fang YE Laifei CHENG Pengfei ZHANG Nan CHAI | 2021 | Journal of Advanced Ceramics2021，10，4： | 4 |
| 6 | Controllable synthesis of mesoporous carbon hollow microsphere twined by CNT for enhanced microwave absorption performance显示文摘The low dielectric loss of mesoporous carbon hollow microsphere(PCHM)requires high filler loading(higher than 20 wt%)when it is used as microwave absorbers.In order to decrease the filler loading of PCHM,a new strategy for synergistic increase of polarization and conductive loss was developed by twining PCHM with carbon nanotube(CNT)according to theoretic calculation.By the optimization of CNT content,the minimum reflection coefficient was -34.6 dB with a filler loading of only 10 wt%,which was much lower than -2.1 dB of PCHM.In addition,the effective absorption bandwidth was 3.6 GHz at X band with a thickness of 2.8 mm.The enhanced microwave absorption performance can be ascribed to the unique combination of hollow PCHM and one-dimensional CNT with higher graphitization degree,leading to increase of conductivity and heterogeneous interfaces.As a result,the conductive loss increased from 0.12 to 2.27 and polarization loss increased from 0.15 to 0.67,achieving the balance between attenuation ability and impedance match. | Minghang Li Xiaomeng Fan Hailong Xu Fang Ye Jimei Xue Xiaoqiang Li Laifei Cheng | 2020 | Journal of Materials Science & Technology2020，59，24： | 4 |
| 7 | Numerical modeling of SiC by low-pressure chemical vapor deposition from methyltrichlorosilane显示文摘The development of functional relationships between the observed deposition rate and the experimental conditions is an important step toward understanding and optimizing low-pressure chemical vapor deposition(LPCVD)or low-pressure chemical vapor infiltration(LPCVI).In the field of ceramic matrix composites(CMCs),methyltrichlorosilane(CH3 SiCl3,MTS)is the most widely used source gas system for SiC,because stoichiometric SiC deposit can be facilitated at 900°C–1300°C.However,the reliability and accuracy of existing numerical models for these processing conditions are rarely reported.In this study,a comprehensive transport model was coupled with gas-phase and surface kinetics.The resulting gas-phase kinetics was confirmed via the measured concentration of gaseous species.The relationship between deposition rate and 24 gaseous species has been effectively evaluated by combining the special superiority of the novel extreme machine learning method and the conventional sticking coefficient method.Surface kinetics were then proposed and shown to reproduce the experimental results.The proposed simulation strategy can be used for different material systems. | Kang Guan Yong Gao Qingfeng Zeng Xingang Luan Yi Zhang Laifei Cheng Jianqing Wu Zhenya Lu | 2020 | Chinese Journal of Chemical Engineering2020，28，6： | 3 |
| 8 | Proportional Limit Stress and Residual Thermal Stress of 3D SiC/SiC Composite显示文摘Proportional limit stress(PLS) and residual thermal stresses(RTS) of 3D SiC/SiC composite were investigated.PLS was obtained by four different methods from the monotonic stress—strain response curve to get a convincing value.RTS in the SiC matrix was quantified by solving the geometric intersection point of the regression lines of hysteresis loops from the periodical loading—unloading—reloading cycle test curve.Classical ACK model and analytical formulas were used to analytically calculate the PLS and RTS of 3D SiC/SiC composite.Good agreement between the experimental results and the analytical calculation was observed.And relationship between the PLS and the RTS of 3D SiC/SiC was discussed. | Shanhua Liu Litong Zhang Xiaowei Yin Yongsheng Liu Laifei Cheng | 2014 | Journal of Materials Science & Technology2014，30，10： | 3 |
| 9 | Microstructure and mechanical properties of three-dimensional carbon/silicon carbide composites fabricated by chemical vapor infiltration显示文摘 | Yongdong Xu Litong Zhang Laifei Cheng Dantao Yan | 1998 | Carbon1998，，7： | 3 |
| 10 | Microstructure and Tribological Behavior of Al2O3 Particle Reinforced Al Matrix Composites Fabricated by Spark Plasma Sintering显示文摘Nanoparticles and microparticles reinforced Al matrix composites were fabricated by spark plasma sintering, and the microstructure and tribological properties were investigated systemically. The nano-Al2O3 particle and micro-Al2O3 particle uniformly dispersed in Al matrix composites. The introduction of nanoparticles is beneficial to the decrease of friction coefficient and wear rate, while microparticles are responsible to the high friction coefficient, resulting in the abrasive wear. With the introduction of both nanoparticles and microparticles, their synergic effect will lead to the variation of tribological behavior. | 杨坤 AN Linan CHENG Laifei | 2019 | Journal of Wuhan University of Technology(Materials Science)2019，34，5： | 2 |
| 11 | Single-atom catalysts for CO oxidation,CO_(2) reduction,and O_(2) electrochemistry显示文摘CO_(x)(x=1,2)and O_(2) chemistry play key roles in tackling global severe environmental challenges and energy issues.To date,the efficient selective electrocatalytic transformations of COx-carbon chemicals,and O_(2)-hydrogenated products are still huge challenges.Single-atom catalysts(SACs)as atomic-scale novel catalysts in which only isolated metal atoms are dispersed on supports shed new insights in overcome these obstacles in CO_(x) and O_(2) chemistry,including CO oxidation,CO_(2) reduction reaction(CO_(2)RR),oxygen reduction reaction(ORR),and oxygen evolution reaction(OER).In this review,the unique features and advanced synthesis strategies of SACs from a viewpoint of fundamental synthesis design are first highlighted to guide future strategy design for controllable SAC synthesis.Then,the to-date reported CO_(2)RR,CO oxidation,OER,and ORR mechanism are included and summarized.More importantly,the design principles and design strategies of improving the intrinsic activity,selectivity,and stability are extensively discussed and the engineering strategy is classified as neighbor coordination engineering,metal-atom engineering,and substrate engineering.Via the comprehensive review and summary of state-of-the-art SACs,the synthesis–structure–property–mechanism–design principle relation can be revealed to shed lights into the structural construction of SACs.Finally,we present an outlook on current challenges and future directions for SACs in CO_(x) and O_(2) chemistry. | Wenyu Yuan Yiyuan Ma Heng Wu Laifei Cheng | 2022 | Journal of Energy Chemistry2022，31，2： | 2 |
| 12 | A Numerical Study of Densification Behavior of Silicon Carbide Matrix Composites in Isothermal Chemical Vapor Infiltration显示文摘We studied the characteristics of two-scale pore structure of preform in the deposition process and the mass transfer of reactant gas in dual-scale pores, and observed the physiochemical phenomenon associated with the reaction. Thereby, we established mathematical models on two scales, respectively, preform and reactor. These models were used for the numerical simulation of the process of ceramic matrix composites densified by isothermal chemical vapor infiltration(ICVI). The models were used to carry out a systematic study on the influence of process conditions and the preform structure on the densification behaviors. The most important findings of our study are that the processing time could be reduced by about 50% without compromising the quality of the material, if the processing temperature is 950-1 000 ℃ for the first 70 hours and then raised to 1 100 ℃. | 关康 WU Jianqing CHENG Laifei | 2018 | Journal of Wuhan University of Technology(Materials Science)2018，33，6： | 2 |
| 13 | 3D printing“wire-on-sphere”hierarchical SiC nanowires/SiC whiskers foam for efficient high-temperature electromagnetic wave absorption显示文摘Electromagnetic wave absorption(EWA)materials for use in extreme environments are of great interest.Herein,SiC nanowires/SiC whiskers(SiC_(nw)/SiC_(w))foam with unique“wire-on-sphere”hierarchical structure was developed for efficient high-temperature EWA.SiC_(w)were assembled to porous SiC_(w)spheres via spray drying and then SiC_(w)spheres were 3D printed to SiC_(w)foam.The catalyst-free precursor infiltration pyrolysis process was first developed to ensure that SiCnwcan intentionally grow in situ on the surface of SiC_(w)spheres,thereby achieving“wire-on-sphere”hierarchical structure foam.At room-temperature,the maximum electromagnetic wave effective absorption bandwidth(EAB_(max))and minimum electromagnetic wave reflection coefficient(RC_(min))of SiC_(nw)/SiC_(w)foam can reach 4 GHz and-57 dB,respectively.At600℃,the EAB_(max)and RC_(min) were 3 GHz and-15 dB,respectively.Furthermore,even oxidized at 1000-1500℃,SiC_(nw)/SiC_(w)foam can still retain EAB_(max)ranging from 2.7 to 3.9 GHz and RC_(min)ranging from-16 dB to-64 dB,because the formation of SiO_(2)layer with appropriate thickness can boost interfacial polarization and regulate impedance matching.The SiC_(nw)/SiC_(w)foam also shows the flexural strength as high as 17.05 MPa.All results demonstrate that the SiC nw/SiC_(w)foam is a promising EWA material for applications of harsh environments.And the material-independent“wire-on-sphere”hierarchical structure and its novel preparation process should find the widespread use in the design and fabrication of high-efficiency EWA micro-nano materials. | Xinyuan Lv Fang Ye Laifei Cheng Litong Zhang | 2022 | Journal of Materials Science & Technology2022，，14： | 2 |
| 14 | Reaction kinetics and ablation properties of C/C–ZrC composites fabricated by reactive melt infiltration显示文摘 | Yiguang Wang Xiaojuan Zhu Litong Zhang Laifei Cheng | 2011 | Ceramics International2011，，4： | 2 |
| 15 | Dielectric,Electromagnetic Interference Shielding and Absorption Properties of Si_3N_4-PyC Composite Ceramics显示文摘Pyrolytic carbon(PyC) was infiltrated into silicon nitride(Si3N4) ceramics by precursor infiltration and pyrolysis (PIP) of phenolic resin,and Ni nanoparticles were added into the phenolic resin to change the electric conductivity of Si3N4-PyC composite ceramics.Dielectric permittivity,electromagnetic interference(EMI) shielding and absorption properties of Si3N4—PyC composite ceramics were studied as a function of Ni content at 8.2—12.4 GHz(X-band).When Ni nanoparticles were added into phenolic resin,the electric conductivity of the prepared composite ceramics decreased with increasing Ni content,which was attributed to the decrease of graphitization degree of PyC.The decrease in electric conductivity led to the decrease in both permittivity and EMI shielding effectiveness.Since too high permittivity is harmful to the impendence match and results in the strong reflection,the electromagnetic wave absorption property of Si3N4—PyC composite ceramics increases with increasing Ni content.When the content of Ni nanoparticles added into phenolic resin was 2 wt%,the composite ceramics possessed the lowest electric conductivity and displayed the most excellent absorption property with a minimum reflection loss as low as -28.9 dB. | Xuan Hao Xiaowei Yin Litong Zhang Laifei Cheng | 2013 | Journal of Materials Science & Technology2013，29，3： | 2 |
| 16 | Environmental Simulation Experiments of 3D-C/SiC Composites with Different PyC Interfacial Layers显示文摘A series of 3D-C/SiC composites with different pyrolytic carbon (PyC) interracial layers (about 20~300 nm thick)were prepared by chemical vapor infiltration. Simulation experiments at different temperatures were performed byexposing C/SiC specimens in single and coupling gases partial pressure atmospheres, namely, O2, H2O vapor andmolten salt (Na+) vapor. It suggested that at intermediate temperature range (about 600~800℃) a dramatic effectof PyC thickness on the weight and strength change of C/SiC was shown, which was mainly influenced by O2 partialpressure; at high temperature range (about 1200~1300℃) the effect was not obvious relatively, which might beinfluenced by H2O vapor partial pressure; and finally at very high temperature range (>1500℃) the molten saltvapor was the factor of most possibility affecting the weight change of C/SiC. | Ning DONG Yongdong XU Laifei CHENG Litong ZHANG | 2003 | Journal of Materials Science & Technology2003，19，z1： | 2 |
| 17 | Effect of Deposition Temperature on Dynamics and Mechanism of Deposition for Si-B-C Ceramic from BCl_3/SiCH_3Cl_3/H_2 Precursor显示文摘The deposition rate, phase, chemical composition and microstructure of deposits were determined from 950 to 1100℃. With increasing temperature, the deposition rate increases, and the morphology changes from smooth to coarse, meanwhile, the concentration of silicon increases while that of boron decreases. The deposition process is controlled by chemical reactions, and the activation energy is 271 kJ/mol. At relatively lower temperature (below 1000℃), the deposition process is dominated by formation of B4C. While at higher temperature (above 1000℃), it is governed by formation of SiC. B4C and SiC disperse uniformly in the Si-B-C co-deposition system and form a dense network structure. | Xinzhang Zuo Litong Zhang Yongsheng Liu Siwei Li Laifei Cheng | 2012 | Journal of Materials Science & Technology2012，28，9： | 2 |
| 18 | Carbon/silicon carbide composites prepared by chemical vapor infiltration combined with silicon melt infiltration显示文摘 | Yongdong Xu Laifei Cheng Litong Zhang | 1999 | Carbon1999，，8： | 2 |
| 19 | Oxidation protection of multilayer CVD SiC/B/SiC coatings for 3D C/SiC composite 显示文摘 | Liu Yongsheng Cheng Laifei Zhang Litong | 2007 | Materials Science and Engineering A2007，466，： | 1 |
| 20 | Realtime damage evaluation of a SiC coated carbon/carbon composite under cyclic fatigue at high temperature in an oxidizing atmosphere显示文摘 | Chidong Liu Laifei Cheng Xingang Luan | 2009 | Materials Science and Engineering A2009，，524： | 1 |
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