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Progress in Research on Structural Ceramic Materials Toughened by Graphene
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作者 Wenyu Yao Yalong Zhang 《Expert Review of Chinese Chemical》 2024年第2期37-42,共6页
Graphene has excellent mechanical properties and unique physical/chemical properties,which make it have a good strengthening and toughening effect on structural ceramic materials.In recent years,it has received widesp... Graphene has excellent mechanical properties and unique physical/chemical properties,which make it have a good strengthening and toughening effect on structural ceramic materials.In recent years,it has received widespread attention and research.This article reviews the mixing and sintering processes in the preparation of graphene/ceramic com-posites,as well as the toughening mechanism of graphene on ceramic materials.It also looks forward to how to further enhance the toughening effect of graphene. 展开更多
关键词 GRAPHENE CERAMICS mixing materials SINTERING TOUGHENING
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Ionomer Toughened Polyolefine 被引量:1
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作者 Xi XU Xiangshen ZENG Shaoyun GUO and Huilin LI (Polymer Research Institute and the State Key Laboratory of Polymer Materials Engineering,Chengdu Uuiversity of Science and Technology, Chengdu, 610065, China) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1995年第6期391-397,共7页
The morphology and properties of HDPE blends with Zn-SEPDM and GR were studied through SEM and mechanical property test. The results show that as Zn-SEPDM/GR content amounts to 20%, the blend becomes an IPN in structu... The morphology and properties of HDPE blends with Zn-SEPDM and GR were studied through SEM and mechanical property test. The results show that as Zn-SEPDM/GR content amounts to 20%, the blend becomes an IPN in structure, and that a rather high impact and tensile strength of HDPE may be obtained after blending. The antistatic effect, the softening point,and HDT of the blend are higher as compared to HDPE/Zn-SEPDM/ZnSt (zinc stearate).The effect of Zn-SEPDM on the compatibility the morphology and properties of IPP blends were studied by DSC, TEM and mechanical properties test. The results show that as Zn-SEPDM content exceeds 20%. Zn-SEPDM in the blend becomes continuous and an abrupt change in impact strength is incurred there from. Owing to the incorporation of ionic groups into EPDM.the strong interactions betWeen the chains make both the impact and the tensile strength of IPP remarkably higher 展开更多
关键词 Zn EPDM HDPE PP GR Ionomer toughened Polyolefine
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Influence of the morphology on mechanical properties of toughened epoxies with CTBN
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作者 胡立江 赵树山 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2000年第3期40-44,共5页
Presents a toughened epoxy risen based on diglycidylether of bisphenol A (DGEBA) cured with ethylene diamine (EDA) and modified with a carboxyl terminated acrylonitrile butadiene (CTBN), studies morphologies with diff... Presents a toughened epoxy risen based on diglycidylether of bisphenol A (DGEBA) cured with ethylene diamine (EDA) and modified with a carboxyl terminated acrylonitrile butadiene (CTBN), studies morphologies with different rubber content and analyses the influence of rubber phase morphology corresponding to different rubber contents on mechanical properties (elastic modulus, uniaxial compression yield stress, shearing strength, uneven tensile strength, critical stress intensity factor K ic  and strain energy release rate G ic ) of toughened epoxies. 展开更多
关键词 toughened epoxy risen CARBOXYL terminated acrylonitrile BUTADIENE MORPHOLOGY ETHYLENEDIAMINE mechanical properties
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Wear Characteristics of Zirconia Toughened Ceramic Drawing Dies
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作者 Zhigang CHEN (Ceramic Research Lab., Jiangsu University of Science and Technology, 212013, Zhenjiang, China) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1995年第5期380-384,共5页
Wear resistance of several zirconia toughened ceramics in comparison with a metal-ceramic Co-WC has been studied in drawing wire field test. Result indicates that the harder the ceramic die, the longer the service lif... Wear resistance of several zirconia toughened ceramics in comparison with a metal-ceramic Co-WC has been studied in drawing wire field test. Result indicates that the harder the ceramic die, the longer the service life. Excellent wear resistance of ceramic die is obtained with a very high hardness (19 GPa). The service life is nearly three times that of Co-WC die. SEM observation on wear surfaces showed that material removal is mainly caused by plastic flow and ploughing process. But when the ceramic is composed of zirconia, alumina and some titanium carbide, micro-chipping and tribochemical reaction take place, and wear rate increases. Wear and friction induced martensite was detected by XRD. The T-M (tetragonal to monoclinic) phase transformation has a contribution to inhibiting microfracture. 展开更多
关键词 WC Wear Characteristics of Zirconia toughened Ceramic Drawing Dies
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Role of Microstructural Features in Toughness Improvement of Zirconia Toughened Alumina
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作者 Olaniyi Fakolujo Ali Merati +2 位作者 Mariusz Bielawski Manon Bolduc Michel Nganbe 《Journal of Minerals and Materials Characterization and Engineering》 2016年第1期87-102,共16页
Ceramics constitute an integral part of highly efficient armours due to their low density, high hardness, strength and stiffness. However, they lack toughness and multi-hit capability. Therefore, zirconia toughened al... Ceramics constitute an integral part of highly efficient armours due to their low density, high hardness, strength and stiffness. However, they lack toughness and multi-hit capability. Therefore, zirconia toughened alumina is investigated. The hardness is evaluated using Vickers, Knoop and instrumented indentations, while the fracture toughness is evaluated using the indentation technique and Charpy tests. The strength is evaluated using ring-on-ring, four point bend and drop weight tests. The Young’s modulus is evaluated using the unloading instrumented indentation curves. Microstructure, porosity and density are characterised using ultrasonic scanning, Archimedes principle, optical and scanning electron microscopy. Results show an indentation size effect on all mechanical properties. A substantial improvement in toughness is achieved through retardation of crack initiation by tetragonal-to-monoclinic phase transformation in zirconia particles, crack deviation thanks to appropriate grain structure, as well as energy absorption by densification due to remaining porosity. This improved toughness is expected to promote multi-hit capability. 展开更多
关键词 Zirconia toughened Alumina Toughening Mechanisms Fracture Toughness Ballistic Performance and Multi-Hit Capability
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EPOXY RESIN TOUGHENED BY THERMOPLASTICS 被引量:2
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作者 傅增力 孙以实 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1989年第4期367-378,共12页
Two kinds of tough ductile heatresisting thermoplastic, namely bisphenol A polysulfone (PSF) and polyethersulfone (PES) were used to toughen thermoset epoxy resin. A systematic study on the relationship between the mo... Two kinds of tough ductile heatresisting thermoplastic, namely bisphenol A polysulfone (PSF) and polyethersulfone (PES) were used to toughen thermoset epoxy resin. A systematic study on the relationship between the molecular weight and the terminal group of the thermoplastic modifier and the fracture toughness of the modified resin was carried out. The morphology of PSF modified epoxy resin was surveyed. With the same kind of PSF the structure of the epoxy resin and the toughening effect of PSF was also investigated. The fractography of PSF, particle modified epoxy was examined in detail with SEM. The contribution of every possible energy absorption process has been discussed. Crack pinning mechanism seems to be the most important toughening mechanism for tough ductile thermoplastic PSF particle modified epoxy system. 展开更多
关键词 POLYSULFONE thermoplastics Epoxy resin Toughening mechanism Crack pinning
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Mechanical and Thermal Properties of Muscovite and Density Polyethylene-reinforced and–toughened Polypropylene Composites 被引量:2
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作者 张凌燕 魏婷婷 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2009年第4期581-587,共7页
The mechanical and thermal properties of polypropylene (PP)/muscovite/ low-density polyethylene (LDPE)/ polypropylenegraftmaleic anhydride (PP-g-MAH) ternary composites were investigated. In PP matrix, muscovite... The mechanical and thermal properties of polypropylene (PP)/muscovite/ low-density polyethylene (LDPE)/ polypropylenegraftmaleic anhydride (PP-g-MAH) ternary composites were investigated. In PP matrix, muscovite, LDPE, and PP-g-MAH were added as strengthening agent, toughening agent, and compatibilizer, respectively. The effects of dosages of the added materials were analyzed. The - experimental results show that the optimum recipe of PP/muscovite/LDPE/PP-g-MAH composites is 100/10/6/20 (mass ratio). Compared with the pure PP, the mechanical properties of PP/muscovite/LDPE/PP-g-MAH composites, including notched impact strength, Rockwell hardness and flexural strength, are improved. Although tensile strength is slightly decreased, they have better toughness. Filled with muscovite, the heat-resistance and heat-decompostion of the composites are improved. 展开更多
关键词 PP LDPE MUSCOVITE reinforcement and toughening
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In-situ Fabricated TiB_2 Particle-whisker Synergistically Toughened Ti(C,N)-based Ceramic Cutting Tool Material 被引量:4
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作者 LIU Hanlian SHI Qiang +3 位作者 HUANG Chuanzhen ZOU Bin XU Liang WANG Jun 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2015年第2期338-342,共5页
The mechanical properties of ceramic cutting tool materials can be modified by introducing proper content of nanoparticles or whiskers.However,the process of adding whiskers or nanoparticles has the disadvantages of h... The mechanical properties of ceramic cutting tool materials can be modified by introducing proper content of nanoparticles or whiskers.However,the process of adding whiskers or nanoparticles has the disadvantages of high cost and health hazard as well as the agglomeration;although a new in-situ two-step sintering process can solve the above problems to some extent,yet the problems of low conversion ratio of the raw materials and the abnormal grain growth exist in this process.In this paper,an in-situ one-step synthesis technology is proposed,which means the growth of whiskers or nanoparticles and the sintering of the compact can be accomplished by one time in furnace.A kind of Ti(C,N)-based ceramic cutting tool material synergistically toughened by TiB_2 particles and whiskers is fabricated with this new process.The phase compositions,relationships between microstructure and mechanical properties as well as the toughening mechanisms are analyzed by means of X-ray diffraction(XRD)and scanning electron microscopy(SEM).The composite which is sintered under a pressure of 32 MPa at a temperature of 1700℃in vacuum holding for 60 min can get the optimal mechanical properties.Its flexural strength,fracture toughness and Vickers hardness are 540 MPa,7.81 MPa·m(1/2)and 20.42 GPa,respectively.The composite has relatively high density,and the in-situ synthesized TiB_2 whiskers have good surface integrity,which is beneficial for the improvement of the fracture toughness.It is concluded that the main toughening mechanisms of the present composite are whiskers pulling-out and crack deflection induced by whiskers,crack bridging by whiskers/particles and multi-scale particles synergistically toughening.This study proposes an in-situ one-step synthesis technology which can be well used for fabricating particles and whiskers synergistically toughened ceramic tool materials. 展开更多
关键词 in-situ synthesis technology TiB_ whisker toughening mechanism Ti(C N)-TiB_ composite tool material
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CNT toughened aluminium and CFRP interface for strong adhesive bonding 被引量:1
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作者 Gang Han Bo Tan +3 位作者 Fei Cheng Binhua Wang Yee-Kwong Leong Xiaozhi Hu 《Nano Materials Science》 EI CAS CSCD 2022年第3期266-275,共10页
This study presents a simple technique for strengthening the adhesive-bond strength between aluminium(Al)substrate and carbon fibre reinforced polymer(CFRP) utilising resin pre-coating(RPC) with carbon nanotubes(CNTs)... This study presents a simple technique for strengthening the adhesive-bond strength between aluminium(Al)substrate and carbon fibre reinforced polymer(CFRP) utilising resin pre-coating(RPC) with carbon nanotubes(CNTs). The CNT-containing RPC solution with 90 wt% acetone and 10 wt% resin(without hardener) was applied onto Al substrates, where micro-/nano-vertical channels had been created by chemical or mechanical surface treatments to accommodate CNTs. RPC was able to fill all micro-/nano-cavities over the Al substrate surface, then CNTs were pulled into those vertical micro-channels by the capillary action generated from acetone evaporation.Normal epoxy adhesive(resin + hardener) was applied after the CNT-containing RPC treatment. CNTs bridging across the interface between the adhesive joint and Al substrate and sealing of micro-/nano-cavities by RPC effectively enhanced the interfacial shear bond strength between the Al substrate and CFRP by 30–100%depending on the Al substrate surface profiles. Al substrates with two different chemical treatments were compared in this study for the effectiveness of CNT interfacial reinforcement. Results from a steel substrate after sandblasting were also included for comparison. 展开更多
关键词 Shear bond strength Interfacial toughening CNT Resin pre-coating(RPC) Chemical surface treatment Aluminium/CFRP Laminate
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La_2Zr_2O_7 TBCs toughened by Pt particles prepared by cathode plasma electrolytic deposition 被引量:1
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作者 Shun-jie Deng Peng Wang +1 位作者 Ye-dong He Jin Zhang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2016年第6期704-715,共12页
La2Zr2O7 thermal barrier coatings(TBCs) with dispersed Pt particles were prepared by cathode plasma electrolytic deposition(CPED) with ceramic balls added to the cathode region. Compared with the conventional CPED... La2Zr2O7 thermal barrier coatings(TBCs) with dispersed Pt particles were prepared by cathode plasma electrolytic deposition(CPED) with ceramic balls added to the cathode region. Compared with the conventional CPED, when ceramic balls are used in the cathode region, the plasma discharge ignition current density decreases approximately 62-fold and the stable plasma discharges occur at the whole cathode surface. Such TBCs with a thickness of 100 μm exhibit a crack-free surface and are composed of pyrochlore-structured La2Zr2O7. Cyclic oxidation, scratching, and thermal insulation capability tests show that such TBCs not only exhibit high resistance to oxidation and spallation but also provide good thermal insulation. These beneficial effects are attributed to the excellent properties of TBCs, such as good thermal insulation because of low thermal conductivity, high-temperature oxidation resistance because of low-oxygen diffusion rate, and good mechanical properties because of the toughening effect of Pt particles. 展开更多
关键词 thermal barrier coatings platinum oxidation resistance toughening electrolytic deposition
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SiC WHISKER-TOUGHENED ALUMINIUM NITRIDE CERAMICS
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作者 李凝芳 D.P.Thompson M.C.Witt 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 1993年第1期1-12,共12页
Aluminium nitride ceramics containing 15 -30 w/o of SiC whiskers can be sintered to full density (by hot pressing at 1800℃)using 2-3 w/o of Y2O3 additions. The whiskers increase the toughness and strength of the comp... Aluminium nitride ceramics containing 15 -30 w/o of SiC whiskers can be sintered to full density (by hot pressing at 1800℃)using 2-3 w/o of Y2O3 additions. The whiskers increase the toughness and strength of the composite, KIC increasing from 2. & to about 5.0 and flexural strength increasing by 30-50%. However, the whiskers must be well dispersed and if the dispersion is not satisfactory, toughness may increase but the strength decreases. The hot-pressing temperature can be reduced by up to 100℃ if Y(NO3)3 . 5H2O is used as the sintering additive instead of Y2O3, but some oxidation of the AIN occurs during heating. Isopropan-2-01 is a better dispersing agent than cyclohexane, but again some oxidation of the AIN does occur.The best sample prepared during this work contained 20 w/o of SiC whiskers and 2 w/o Y2O3 added as Y(NO3)3. 5H2O and mixed in isopropanol. This exhibited a mean strength of 453MPa (maximum 522MPa, measured by disc flexure) and a fracture toughness of5. 5MPam1/2. 展开更多
关键词 WHISKER aluminium nitride toughen ADDITIVE dispersing agents
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TOUGHNESS INCREMENT BY CRACK GROWTH IN TOUGHENED STRUCTURAL MATERIALS
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作者 Yang Wei (Tsinghua University,Beijing 100084,China) 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 1991年第2期131-139,共9页
Material toughening could be furnished by the energy dissipating wakes and bridging segments during crack growth.According to their contributions to the energy integral applicable to a growing crack,the toughening mec... Material toughening could be furnished by the energy dissipating wakes and bridging segments during crack growth.According to their contributions to the energy integral applicable to a growing crack,the toughening mechanisms are categorized as: dilatational plasticity and induced shear yielding in the crack wakes,bridging due to second inclusion phases,and the matrix bridging caused by wavy crack front.Detailed toughening analysis is pursued for structural polymers and composite materials reinforced by short aligned fibers. 展开更多
关键词 material toughening crack growth BRIDGING dilatational plasticity
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Effect of toughened epoxy resin on partial discharge at solid-solid interface
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作者 李曼苹 吴锴 +1 位作者 张钊 成永红 《Plasma Science and Technology》 SCIE EI CAS CSCD 2017年第2期28-33,共6页
A series of solid-solid interfaces, consisting of ceramic-epoxy resin interface samples with a tip-plate electrode, were investigated by performing partial discharge tests and realtime electrical tree observations. A ... A series of solid-solid interfaces, consisting of ceramic-epoxy resin interface samples with a tip-plate electrode, were investigated by performing partial discharge tests and realtime electrical tree observations. A toughening agent was added to the epoxy resin at different ratios for comparison. The impact strength, differential scanning calorimetry (DSC) and dielectric properties of the cured compositions and ceramic were tested. The electric field strength at the tip was calculated based on Maxwell's theory. The test results show that the addition of a toughener can improve the impact strength of epoxy resin but it decreases the partial discharge inception voltage (PDIV) of the interface sample. At the same time, toughening leads to complex branches of the electrical tree. The simulation result suggests that this reduction of the PDIV cannot be explained by a change of permittivity due to the addition of a toughening agent. The microstructural change caused by toughening was considered to be the key factor for lower PDIV and complex electrical tree branches. 展开更多
关键词 TOUGHENING epoxy resin partial discharge solid-solid interface electrical tree
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CTBN-TOUGHENED EPOXY RESINS——EFFECT OF CURING MECHANISM ON NETWORK STRUCTURE OF THE RUBBER PHASE
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作者 宋爱腾 余云照 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1990年第2期183-187,共5页
Epoxy resins toughened with carboxyl-terminated butadieneacrylonitrile copolymers (CTBN) are two-phase thermosets. The network of the in situ formed rubber particles depends upon the curing mechanism of the resin. Whe... Epoxy resins toughened with carboxyl-terminated butadieneacrylonitrile copolymers (CTBN) are two-phase thermosets. The network of the in situ formed rubber particles depends upon the curing mechanism of the resin. When a primary polyamine such as triethylene tetramine was used as curing agent, the network of the rubber phase was quite incomplete, whereas a perfect rubber network was formed with 2-ethyl-4-methyl imidazole as the curing agent. 展开更多
关键词 Epoxy resin TOUGHENING liquid rubber.
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Effect of Grain Size of β-Si_3N_4 and Glassy Phase on Strength and Fracture Toughness of In-Situ Toughened Si_3N_4
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作者 罗学涛 《High Technology Letters》 EI CAS 1996年第2期84-88,共5页
An in-situ toughened Si_3N_4 ceramic is obtained by hot-pressing.Its flexural strength and fracture toughness are 960MPa,12.74MPa·m^(1/2)at room temperature and 720MPa,23.94 MPa·m~_(1/2)at 1350℃,respectivel... An in-situ toughened Si_3N_4 ceramic is obtained by hot-pressing.Its flexural strength and fracture toughness are 960MPa,12.74MPa·m^(1/2)at room temperature and 720MPa,23.94 MPa·m~_(1/2)at 1350℃,respectively.The relation between grain size of β-Si_3N_4 and mechanical properties is investigated.The glassy phase containing Y and La plays an important role in increasing high-temperature mechanical properties because of its high viscosity and softening temperature.Crack deflection,crack branching and pullout of rodlike β-Si_3N_4 grains are ob- served in this material by SEM,and the toughening mechanisms are discussed. 展开更多
关键词 Si_3N_4 In-situ toughening MICROSTRUCTURE STRENGTH Fracture toughness
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Strengthened and toughened SiHfBCN-based hightemperature resistant adhesive with SiC NWs
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作者 Xingang LUAN Xiyue ZHU +2 位作者 Xichao DONG Min LI Laifei CHENG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2024年第7期539-549,共11页
To further improve the performance of binders,a SiHfBCN-based high-temperature resistant adhesive was successfully synthesized by Polymer-Derived Ceramics(PDC)route using TiB2,Polysiloxane(PSO)and short SiC nanowires ... To further improve the performance of binders,a SiHfBCN-based high-temperature resistant adhesive was successfully synthesized by Polymer-Derived Ceramics(PDC)route using TiB2,Polysiloxane(PSO)and short SiC nanowires as fillers.The effect of short SiC nanowires on the adhesive strength at room temperature and high temperature,as well as the reinforcing mechanism was studied.Compared with the adhesive without SiC nanowires,after curing(at 170℃)and pyrolysis(at 1000℃)in air,the appropriate adding of SiC nanowires upgrades the room temperature and high temperature(at 1000℃ in air)adhesive strength to(12.50±0.67)MPa(up by about 32%)and(13.11±0.79)MPa(up by about 106%),respectively.Attractively,under the synergistic impact of the nanowire bridging,nanowire breaking,nanowire drawing and crack deflection,the optimized adhesive exhibits multi-stage fracture,causing the increscent fracture displacement. 展开更多
关键词 High-temperature resistant adhesive SiHfBCN SiC NWs Strengthening TOUGHENING
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Boron nitride microribbons strengthened and toughened alumina composite ceramics with excellent mechanical,dielectric,and thermal conductivity properties
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作者 Jilin Wang Dongping Lu +8 位作者 Weiping Xuan Yuchun Ji Ruiqi Chen Shaofei Li Wenbiao Li Wenzhuo Chen Shilin Tang Guoyuan Zheng Fei Long 《Journal of Advanced Ceramics》 SCIE EI CAS CSCD 2024年第4期496-506,共11页
Aluminum oxide(Al_(2)O_(3))ceramics have been widely utilized as circuit substrates owing to their exceptional performance.In this study,boron nitride microribbon(BNMR)/Al_(2)O_(3)composite ceramics are prepared using... Aluminum oxide(Al_(2)O_(3))ceramics have been widely utilized as circuit substrates owing to their exceptional performance.In this study,boron nitride microribbon(BNMR)/Al_(2)O_(3)composite ceramics are prepared using spark plasma sintering(SPS).This study examines the effect of varying the amount of toughened phase BNMR on the density,mechanical properties,dielectric constant,and thermal conductivity of BNMR/Al_(2)O_(3)composite ceramics while also exploring the mechanisms behind the toughening and increased thermal conductivity of the fabricated ceramics.The results showed that for a BNMR content of 5 wt%,BNMR/Al_(2)O_(3)composite ceramics displayed more enhanced characteristics than pure Al_(2)O_(3)ceramics.In particular,the relative density,hardness,fracture toughness,and bending strength were 99.95%±0.025%,34.11±1.5 GPa,5.42±0.21 MPa·m^(1/2),and 375±2.5 MPa,respectively.These values represent increases of 0.76%,70%,35%,and 25%,respectively,compared with the corresponding values for pure Al_(2)O_(3)ceramics.Furthermore,during the SPS process,BNMRs are subjected to high temperatures and pressures,resulting in the bending and deformation of the Al_(2)O_(3)matrix;this leads to the formation of special thermal pathways within it.The dielectric constant of the composite ceramics decreased by 25.6%,whereas the thermal conductivity increased by 45.6%compared with that of the pure Al_(2)O_(3)ceramics.The results of this study provide valuable insights into ways of enhancing the performance of Al_(2)O_(3)-based ceramic substrates by incorporating novel BNMRs as a second phase.These improvements are significant for potential applications in circuit substrates and related fields that require high-performance materials with improved mechanical properties and thermal conductivities. 展开更多
关键词 boron nitride microribbons/aluminum oxide(BNMRs/Al_(2)O_(3))composite ceramics boron nitride microribbon(BNMR) spark plasma sintering(SPS) strengthening and toughening thermal conductivity
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MoS_(2)Lubricate‑Toughened MXene/ANF Composites for Multifunctional Electromagnetic Interference Shielding
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作者 Jiaen Wang Wei Ming +8 位作者 Longfu Chen Tianliang Song Moxi Yele Hao Zhang Long Yang Gegen Sarula Benliang Liang Luting Yan Guangsheng Wang 《Nano-Micro Letters》 SCIE EI CAS 2025年第2期358-371,共14页
The design and fabrication of high toughness electromagnetic interference(EMI)shielding composite films with diminished reflection are an imperative task to solve electromagnetic pollution problem.Ternary MXene/ANF(ar... The design and fabrication of high toughness electromagnetic interference(EMI)shielding composite films with diminished reflection are an imperative task to solve electromagnetic pollution problem.Ternary MXene/ANF(aramid nanofibers)–MoS_(2)composite films with nacre-like layered structure here are fabricated after the introduction of MoS_(2)into binary MXene/ANF composite system.The introduction of MoS_(2)fulfills an impressive“kill three birds with one stone”improvement effect:lubrication toughening mechanical performance,reduction in secondary reflection pollution of electromagnetic wave,and improvement in the performance of photothermal conversion.After the introduction of MoS_(2)into binary MXene/ANF(mass ratio of 50:50),the strain to failure and tensile strength increase from 22.1±1.7%and 105.7±6.4 MPa and to 25.8±0.7%and 167.3±9.1 MPa,respectively.The toughness elevates from 13.0±4.1 to 26.3±0.8 MJ m^(−3)(~102.3%)simultaneously.And the reflection shielding effectiveness(SE_(R))of MXene/ANF(mass ratio of 50:50)decreases~10.8%.EMI shielding effectiveness(EMI SE)elevates to 41.0 dB(8.2–12.4 GHz);After the introduction of MoS_(2)into binary MXene/ANF(mass ratio of 60:40),the strain to failure increases from 18.3±1.9%to 28.1±0.7%(~53.5%),the SE_(R)decreases~22.2%,and the corresponding EMI SE is 43.9 dB.The MoS_(2)also leads to a more efficient photothermal conversion performance(~45 to~55℃).Additionally,MXene/ANF–MoS_(2)composite films exhibit excellent electric heating performance,quick temperature elevation(15 s),excellent cycle stability(2,2.5,and 3 V),and long-term stability(2520 s).Combining with excellent mechanical performance with high MXene content,electric heating performance,and photothermal conversion performance,EMI shielding ternary MXene/ANF–MoS_(2)composite films could be applied in many industrial areas.This work broadens how to achieve a balance between mechanical properties and versatility of composites in the case of high-function fillers. 展开更多
关键词 MXene-MoS_(2) Lubrication toughening EMI shielding Photothermal conversion Electric heating performance
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Preparation and toughening mechanism of Al_(2)O_(3) composite ceramics toughened by B_(4)C@TiB_(2) core–shell units 被引量:1
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作者 Yingjie Shi Weixing Li +7 位作者 Xiaorong Zhang Jiachao Jin Jilin Wang Yu Dong Jingbo Mu Guangsuo Wang Xiaoliang Zhang Zhixiao Zhang 《Journal of Advanced Ceramics》 SCIE EI CAS CSCD 2023年第12期2371-2381,共11页
In this paper, the concept of incorporating core–shell structured units as secondary phases totoughen Al_(2)O_(3) ceramics is proposed. Al_(2)O_(3) composite ceramics toughened by B_(4)C@TiB_(2) core–shellunits are ... In this paper, the concept of incorporating core–shell structured units as secondary phases totoughen Al_(2)O_(3) ceramics is proposed. Al_(2)O_(3) composite ceramics toughened by B_(4)C@TiB_(2) core–shellunits are successfully synthesized using a combination of molten salt methodology and spark plasmasintering. The synthesis of B_(4)C@TiB_(2) core–shell toughening units stems from the prior production ofcore–shell structural B_(4)C@TiB_(2) powders, and this core–shell structure is effectively preserved withinthe Al_(2)O_(3) matrix after sintering. The B_(4)C@TiB_(2) core–shell toughening unit consists of a micron-sizedB4C core enclosed by a shell approximately 500 nm in thickness, composed of numerous nanosizedTiB2 grains. The regions surrounding these core–shell units exhibit distinct geometric structures andencompass multidimensional variations in phase composition, grain dimensions, and thermal expansioncoefficients. Consequently, intricate stress distributions emerge, fostering the propagation of cracks inmultiple dimensions. This behavior consumes a considerable amount of crack propagation energy,thereby enhancing the fracture toughness of the Al_(2)O_(3) matrix. The resulting Al_(2)O_(3) composite ceramicsdisplay relative density of 99.7%±0.2%, Vickers hardness of 21.5±0.8 GPa, and fracture toughness6.92±0.22 MPa·m1/2. 展开更多
关键词 Al_(2)O_(3)composite ceramics microstructure design core-shell structure toughening mechanism spark plasma sintering(SPS)
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High Performance Polylactide Toughened by Supertough Polyester Thermoplastic Elastomers:Properties and Mechanism
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作者 FENG Songyang ZHAO Wuchao +1 位作者 HE Jianghua ZHANG Yuetao 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2023年第5期750-756,共7页
It is a challenge to develop a biodegradable toughener to toughen polylactic acid(PLA)with both high strength and high toughness,since toughness and strength are mutually exclusive.Here,a series of supertough polyeste... It is a challenge to develop a biodegradable toughener to toughen polylactic acid(PLA)with both high strength and high toughness,since toughness and strength are mutually exclusive.Here,a series of supertough polyester thermoplastic elastomers(TPEs),poly(L/D-lactide)-b-poly(ε-caprolactone-co-δ-valerolactone)-b-poly(L/D-lactide)s(PLLA-PCVL-PLLA,L-TPEs or PDLA-PCVL-PDLA,D-TPEs),were prepared and blended with a PLLA matrix to toughen PLLA.The mechanical properties of PLLA could be regulated in a wide range by changing blending ratios and TPE structures.For PLLA blends toughened by L-TPEs,the highest elongation at break is up to 425%with the tensile strength of 33.1 MPa and the toughness of 104 MJ/m3.By the stereocomplex crystallization of PLA(sc-PLA),the tensile strength of the PLLA/D-TPE blends further increased to 41.8 MPa with a similar elongation at break(418%)and the toughness up to 128 MJ/m3.The detailed characterizations revealed a toughening mechanism:(I)the added soft segments increased the ductility of the PLLA matrix,(II)the PLLA segments of L-TPEs increased the compatibility between TPEs and PLLA matrix,and(III)the formation of sc-PLA between the PDLA segments in D-TPE and PLLA provided higher tensile strength by enhancing the strength of the crystal skeleton.The toughened PLA using TPEs can maintain original non-toxic and degradable properties,and be applied potentially in surgical sutures,and 3D-printed scaffolds. 展开更多
关键词 Super-tough polyester elastomer Poly-L-lactic acid toughening Biodegradable polymer Stereocomplex crystallization
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