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1.
在电磁屏蔽领域,铁氧体是常用的涂覆型吸波剂,但以Fe3O4为首的铁氧体存在一些不足。本研究采用冷冻干燥的方法成功制备了花苞状Ti3C2Tx/Fe3O4复合材料,Ti3C2Tx/Fe3O4复合材料的花苞状结构对电磁波的多重反射、界面极化和电磁耦合作用等使复合材料具有更好的微波吸收性能。当频率为6.74 GHz时,最小反射损耗达到-51.41 dB,对应的匹配厚度为2.8 mm,这意味着它可以吸收99.999 28%的电磁波。本研究中特殊的花苞状Ti3C2Tx/Fe3O4复合材料表现出优异的吸波性能,在电磁屏蔽领域具有良好的应用前景。  相似文献   

2.
为了改善传统碳材料的吸波性能,获得具有多元吸波机理的吸波材料,本文通过化学气相沉积法在碳纤维表面原位生长碳纳米管,后采用溶剂热反应在CNTs@Cf上生成Fe3O4纳米颗粒,制备出了Fe3O4/CNTs@Cf复合材料,并对其吸波性能进行研究,分析了复合材料的合成机理和吸波机理。其反射损耗在C波段可达-43.02 dB,随着Fe3O4纳米颗粒含量的进一步增加,其吸波性能下降。  相似文献   

3.
为了实现目前实际应用对吸波材料“轻、薄、宽、强”的要求,本工作采用氧化石墨烯(GO)结合磁性纳米粒子四氧化三铁(Fe3O4)构筑了一类新型的轻质且具有良好柔韧性的复合纳米纸吸波材料,希望其能简化复合材料成型工艺并替代吸波涂料,实现对吸波性能的调控。首先,利用γ-氨丙基三乙氧基硅烷(KH-550)对Fe3O4纳米粒子进行有机化修饰,制备了分散均匀、具有电磁双损性能的Fe3O4-GO复合纳米粒子,进而利用溶剂蒸发沉积法制备了GO及Fe3O4-GO纳米纸,并对其结构及性能进行了研究。结果表明,NH2-Fe3O4稳定附着在GO片层上,当Fe3O4与GO的质量比为4∶6时,其输入阻抗Zin与自由空间阻抗Z0最为接近,复合纳米纸的阻抗匹配性能最好。Fe3  相似文献   

4.
用电弧法制备含铁的单壁碳纳米管(SWCNTs), 并将其提纯之后掺杂到用溶胶-凝胶自燃法制备的M型六角钡铁氧体(BaFe12O19)纳米晶粉体中, 得到了具有网状结构的复合材料。利用同轴法测试了样品的电磁参数, 研究了不同混合比SWCNTs/BaFe12O19 复合材料的吸波性能。结果表明: 复合粉体SWCNTs/BaFe12O19的磁损耗主要是由于自然共振和交换共振引起的; 当掺杂2%(质量分数)SWCNTs时, 微波反射衰减最大值可以达到 24.85 dB, 高于10 dB的频带宽度可以达到6.30 GHz, 具有较宽的吸波频段。   相似文献   

5.
采用共沉淀法成功制备出具有超顺磁性的纳米Fe3O4, 并将Fe3O4与SrFe12O19复合制成复合吸波材料Fe3O4-SrFe12O19, 利用X射线衍射仪(XRD)、透射电镜(TEM)、振动样品磁强计(VSM)和矢量网络分析仪(PNA)对产物的物相、显微结构、磁性能和吸波性能进行了表征与分析。结果表明, 当Fe3O4与SrFe12O19质量比为1∶0.3时, Fe3O4-SrFe12O19饱和磁化强度为11.1 emu·g-1, 矫顽力0.86 Oe, 剩余磁化强度0.08 emu·g-1, 其吸波性能最佳, 最大吸收峰值为-17.7 dB,-5 dB频宽为1.3 GHz, 较Fe3O4和 SrFe12O19的最大吸收峰值分别提高247%和185%, 频带分别拓宽1.12 GHz和0.40 GHz。  相似文献   

6.
通过直流电弧放电法制备了高结晶性单壁碳纳米管(SWCNTs),采用溶胶凝胶自燃法制备CoFe2O4,并将两种材料复合制成SWCNTs-CoFe2O4双层吸波材料。使用Raman光谱、XRD、SEM、TEM和矢量网络分析仪对SWCNTs和CoFe2O4的形貌、结构和电磁性能进行了表征,并利用传输线理论分析了SWCNTs-CoFe2O4双层吸波材料在2~18 GHz频带内的微波吸收性能。结果表明,相对于单一材料,SWCNTs-CoFe2O4双层复合材料的吸波性能得到了极大提高。当CoFe2O4作为匹配层、SWCNTs作为吸收层时,通过调节匹配层和吸收层的厚度,SWCNTs-CoFe2O4双层复合材料的最强反射损耗可以达到-61.13 dB,低于-10 dB的吸收带宽达到7 GHz (8~15 GHz)。因此,SWCNTs-CoFe2O4双层复合材料是一种新型的有应用前景的高吸收宽频带吸波材料。  相似文献   

7.
先以氧化石墨烯和三氯化铁为原料并用高温水热法制备还原氧化石墨烯/ Fe3O4(rGO/Fe3O4)复合物,再用其改性环氧树脂制备出rGO/Fe3O4/环氧树脂复合材料,研究了(rGO/Fe3O4)复合物的添加对其性能的影响。结果表明,(rGO/Fe3O4)复合物的添加量为30%的复合材料其冲击强度达到27 kJ/m2,比纯环氧树脂的冲击强度提高了58.8%。在环氧树脂中添加rGO/Fe3O4复合物,使其吸波性能显著提高。rGO/Fe3O4复合物的添加量为20%的复合材料,其反射率在小于-10 dB的频率范围为7.7~12.3 GHz,有效吸收频宽达4.6 GHz,覆盖了整个X波段。随着石墨烯含量的提高rGO/Fe3O4/环氧树脂复合材料达到最小反射率的位置向低频位置移动,控制rGO和Fe3O4的相对含量可调控这种复合材料的吸波性能。  相似文献   

8.
Two-dimensional(2D)ferromagnets with out-of-plane(OOP)magnetic anisotropy are potential candidates for realizing the next-generation memory devices with ultra-low power consumption and high storage density.However,a scalable approach to synthesize 2D magnets with OOP anisotropy directly on the complimentary metal-oxide semiconductor(CMOS)compatible substrates has not yet been mainly explored,which hinders the practical application of 2D magnets.This work demonstrates a cascaded space confined chemical vapor deposition(CS-CVD)technique to synthesize 2D FexGeTe2 ferromagnets.The weight fraction of iron(Fe)in the precursor controls the phase purity of the as-grown FexGeTe2.As a result,high-quality Fe3GeTe2 and Fe5GeTe2 flakes have been grown selectively using the CS-CVD technique.Curie temperature(Tc)of the as-grown FexGeTe2 can be up to-280 K,nearly room temperature.The thickness and temperature-dependent magnetic studies on the Fe5GeTe2 reveal a 2D Ising to 3D XY behavior.Also,Terahertz spectroscopy experiments on Fe5GeTe2 display the highest conductivity among other FexGeTe2 2D magnets.The results of this work indicate a scalable pathway for the direct growth and integration of 2D ternary magnets on CMOS-based substrates to develop spintronic memory devices.  相似文献   

9.
王志俊  刘兴龙  吴智清  曹若昭  刘浩  陶锋 《功能材料》2023,(3):3208-3216+3223
轻质高性能碳基吸波材料的高效低成本制备是一个巨大的挑战。研究以生物质体内的维管束为模板,在无催化剂条件下成功制备了一种新型碳微米线圈阵列吸波剂。这种碳微米线圈阵列由碳微米线圈取向排列而成,包含有大孔通道、螺旋狭缝孔以及表面微孔构成的分级多孔结构。这种独特的多孔阵列结构体现了良好阻抗匹配性,有利于入射电磁波充分进入吸波体内部,增大电耦合和磁耦合作用面积,同时增加电磁波的反射和散射损耗路径,有利于电磁波吸收损耗。碳线圈表面富氧官能团提高了丰富的极化中心,增强了微波吸收的极化损耗。吸波性能结果表明,碳微米线圈阵列是一种轻质、强吸收的微波吸收体,在填料比为10%(质量分数)时,其最大有效吸收带宽(fe)可达5.5 GHz;而填料比为15%(质量分数)时,最大反射损耗(RLmin)为-45.09 dB。这种维管束基碳线圈阵列的无催化剂制备方法可以在其他生物质中应用。  相似文献   

10.
对纳米金刚石(ND)进行羧基化处理以提高其分散性,然后采用沉淀法制备了羧基化ND负载Fe2O3的催化剂。利用XRD、TG、BET和TEM对该负载型催化剂进行表征,通过DSC研究其对高氯酸铵(AP)热分解的催化作用。结果表明:ND经过羧基化处理后,在水中的分散性大幅度提高。沉淀法制备了直径5 nm、长50 nm的Fe2O3包裹或附着于ND的负载型复合催化剂,该催化剂对AP高温热分解的催化效果优于单一的Fe2O3或ND。当Fe2O3和ND的质量比为5∶1、在AP中添加质量分数2%的复合催化剂时,AP的高温分解峰温降低约30 ℃,ND负载Fe2O3催化剂具有一定的协同催化作用。  相似文献   

11.
In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.  相似文献   

12.
We associate a variety of innovations with the term "Industry 4.0". The pioneer of many 4.0 modifications forms the basisfor the trend towards the integrated di...  相似文献   

13.
14.
ABSTRACT

The production of ferrous metal increased during the Roman Late Republican period, Principate and Empire. The direct bloomery process was used to extract the metal from its ores using slag-tapping and slag-pit furnaces. The fuel was charcoal and an air blast was introduced by bellows-operated tuyères. Iron formed as a bloom, often as a spongy mass of metal, which contained impurities from the smelting process, including unreacted ore, fuel, slag and fragments from the furnace walls, while the metal was often inhomogeneous with varied carbon contents. Blooms were either smithed directly into bars or ingots or they were broken up, which also allowed the removal of gross impurities and a selection of pieces with similar properties to be made. These could then be forge-welded together and formed into characteristically shaped ingots. Making steel in the furnace seems to have been achieved: it depended on the ore and the furnace and conditions within it. Surface carburization was also carried out. Iron and steel were used extensively in construction and for tools and weapons. Fire welding was often used to add pieces of steel to make the edges of tools and weapons, which could be heat-treated by quenching to harden them.  相似文献   

15.
Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……  相似文献   

16.
A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.  相似文献   

17.
A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.  相似文献   

18.
Al2O3-ZrO2 nanocomposites were developed starting with the solgel process. Composite alumina-zirconia nanopowders were synthesized from metallorganic precursors (Aluminium secondary butoxide and zirconium Iso propoxide) using the solgel process. The parameters affecting the synthesis—solvent, concentration of precursor, R/H ratio (i.e., dilution of water in solvent)—were varied as also the temperature and pH. BET and TEM were used to measure nanosize. Diffuse reflectance spectroscopy and also qualitative optical absorption led to identical particle size estimate. The variation of process parameters was used to study the effect and interdependence of process parameters. Artificial Neural Networks was used to rigorously analyze the process. Although this led to confirmation of interdependence of parameters, the presence of a single overwhelming solvent variable was also established. Then the optimal process was used to synthesize more nanopowder. To produce bulk nanocomposite the nanopowders were sintered by varying the temperature and time period. The sintered lithoids were probed with a vickers hardness tester to measure elastic modulus, hardness, and fracture toughness. The results showed high elastic modulus, modest hardness, and very high fracture toughness.  相似文献   

19.
On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……  相似文献   

20.
Friction stir processing (FSP) is an important technique for preparing surface composites. Fabricating defect-free surface composites with uniform particle distribution by FSP is a challenging task. In this study, silicon carbide particles reinforced AA5083 alloy surface composites was fabricated using different FSP strategies including variation in process parameters, dual-tool processing and tool offset overlapping. Material flow of the processed material with reinforcement particles demonstrated that the distribution of particles was influenced by the stirring action of the probe as well as the extrusion of the plasticized material due to the movement of the tool. Process parameters, particularly rotational speed, showed a dominant influence on the distribution of silicon carbide particles.  相似文献   

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