碳织物复合材料力学性能研究

本文研究了织物编织类型及树脂含量对碳织物复合材料力学性能的影响。试验结果证明，平纹织物复合材料的力学性能最低，缎纹织物复合材料的力学性能最高；当树脂含量为wt42—45％时，碳织物复合材料的拉伸、压缩性能最佳。     

平面三向织物增强橡胶复合材料的偏轴拉伸性能研究

研究了平面三向织物增强橡胶复合材料的偏轴拉伸性能,并与平纹织物增强橡胶复合材料的偏轴拉伸性能进行了对比,同时分析了试样形状（长方形和哑铃形）对织物增强橡胶复合材料的偏轴拉伸的影响。结果表明,平面三向织物增强橡胶复合材料在各个方向的拉伸断裂强度及断裂伸长率变化较小,表现出准各向同性,而平纹织物增强橡胶复合材料则表现为明显的各向异性;哑铃形试样更适合织物增强橡胶复合材料的偏轴拉伸性能测试。     

平面三向织物增强橡胶复合材料撕裂性能研究

研究了平面三向织物及其增强橡胶复合材料的撕裂性能,分别对预切口平行于平面三向织物中某一组纱线和平行于平面三向织物中相邻两组纱线角平分线方向2种情况下的撕裂性能进行研究,并与平纹织物增强橡胶复合材料进行了对比.结果表明,平面三向织物及其增强橡胶复合材料的撕裂过程可分为初始阶段、预切口张开阶段和撕裂口扩展阶段等3个阶段,分...     

玻璃纤维增强酚醛树脂复合材料摩擦磨损性能研究

对几种玻璃纤维织物增强酚醛树脂复合材料进行了双向滑动摩擦试验,考察织物结构和基体树脂对复合材料的摩擦磨损性能的影响。研究结果表明:通过添加自润滑颗粒可提高复合材料的摩擦磨损性能,其中石墨的耐摩擦磨损效果比聚四氟乙烯(PTFE)显著;织物结构对复合材料摩擦性能的影响,主要受控于织物的表面粗糙度和织物结构对复合材料树脂体积分数的影响。此外,复合材料存在一个较优的树脂体积分数范围,在此范围内,复合材料的摩擦磨损性能较为优异。     

薄型碳纤维织物预浸料及其复合材料研究

采用国产1k T300级薄型碳纤维织物和中温固化高性能树脂制备预浸料。测试了该预浸料及其复合材料性能,并与国产3k T300级碳纤维织物预浸料及其复合材料性能进行对比。研究结果表明:国产1k T300级薄型碳纤维织物的复合材料性能与国产3k T300级碳纤维织物的复合材料性能相当;该薄型碳纤维织物复合材料的树脂体系是改性增韧环氧树脂,韧性好,适用于轻质夹层结构复合材料,具有较高滚筒剥离强度;同时,该轻质复合材料耐热性好,玻璃化转变温度能达到200℃。     

中温固化环氧树脂芳纶Ⅲ纤维复合材料性能研究

对芳纶Ⅲ纤维和及其织物(F-3S175)的性能进行测试,采用热熔法制备了3233中温固化环氧树脂F-3S175芳纶布预浸料,通过热压罐法成型复合材料层合板和蜂窝夹层板,进行性能测试,与Kevlar 49纤维进行对比。结果表明,芳纶Ⅲ纤维、织物和其3233树脂复合材料性能高于Kevlar 49芳纶纤维、织物及其复合材料性能。     

超高分子量聚乙烯纤维在防弹材料上的应用

研究了基体树脂的模量、含量、纤维织物结构，复合材料面密度等因素对ＵＨＭＷＰＥ纤维复合材料弹道性能的影响，并对复合材料在弹道冲击下的破坏现象及机理进行了解释。     

短切碳纤维对GF-Fabric/EP夹层复合材料的增强作用研究

针对高速列车、新能源汽车等交通工具对高性能泡沫夹层复合材料的迫切需求，制备了玻璃纤维三维立体织物增强环氧树脂泡沫复合材料（下称GF-Fabric/EP复合材料）及其夹层结构，并重点探索短切碳纤维（Short carbon fiber,SCF）对其泡沫本身及夹层复合材料的增强作用。研究结果表明，SCF的填充通过受载时阻断环氧树脂泡沫内部裂纹的扩展，利用自身断裂及与基体脱粘等消耗能量，显著提升环氧树脂泡沫的力学性能，并可与玻璃纤维三维立体织物实现协同增强效果，在填充质量比为2%时复合材料力学性能最佳。同时，基于纤维的“桥联”作用，SCF的引入亦可有效改善铝合金面板与芯材的界面性能。     

国产对位芳纶机织物应用与发展

介绍了对位芳纶机织物的结构及性能,阐述了国产对位芳纶机织物在防弹、复合材料、音盆、建筑补强及特种过滤等领域的应用,并与应用领域内同类产品进行了比较。结果表明,对位芳纶机织物是一种性能优异的新材料,其应用潜力巨大。     

纬编双轴向多层衬纱织物增强复合材料的弯曲性能研究

本文主要对高性能纤维的纬编双轴向多层衬纱织物增强复合材料的弯曲性能进行研究分析.本文所用的增强纤维为玻璃纤维和高强聚乙烯纤维两种,增强织物包括玻璃纤维织物、高强聚乙烯纤维织物及玻璃纤维/聚乙烯纤维层间混合织物三种,基体为乙烯基酯树脂,文中着重对几种复合材料的弯曲性能进行测试和分析比较.分析结果表明,该类复合材料有很好的弯曲性能,含有玻璃纤维的横向弯曲破坏有其特点,玻璃纤维为脆性破坏,而聚乙烯纤维表现为屈曲破坏.     

Influence of textile parameters on the in‐plane permeability characteristics of non‐crimped fabric preforms

Material parameters such as the permeability of dry reinforcing textiles are key variables for modern composite production using liquid composite molding (LCM) technique. Nowadays numerical filling simulations are required for predicting the mold filling behavior. Inaccurate predictions can lead to a high risk of air inclusion and corresponding need for cost‐intense revision of the mold design. Permeability values of the textiles used in the process are basic requirements for a numerical filling simulation, since the permeability is directly linked to the filling behavior. Nevertheless, the permeability values of non‐crimped fabrics (NCF) which are used for aerospace and automotive structures are rare. In this study the influence of textile parameters of NCF on the in‐plane permeability has been investigated using a capacitive in‐plane permeability measurement technology. The results show the influence of the roving filament number as well as the used stitch length on the in‐plane permeability. It is confirmed that the textile grammage is not affecting the in‐plane permeability of NCF reinforcements. The results of this study are valuable for textile selection with specific permeability data as well as for numerical filling simulations. POLYM. COMPOS., 37:1854–1863, 2016. © 2015 Society of Plastics Engineers     

Comparison of mechanical properties of epoxy composites reinforced with stitched glass and carbon fabrics: Characterization of mechanical anisotropy in composites and investigation on the interaction between fiber and epoxy matrix

The primary purpose of the study is to evaluate and compare the mechanical properties of epoxy‐based composites having different fiber reinforcements. Glass and carbon fiber composite laminates were manufactured by vacuum infusion of epoxy resin into two commonly used noncrimp stitched fabric (NCF) types: unidirectional and biaxial fabrics. The effects of geometric variables on composite structural integrity and strength were illustrated. Hence, tensile and three‐point bending flexural tests were conducted up to failure on specimens strengthened with different layouts of fibrous plies in NCF. In this article, an important practical problem in fibrous composites, interlaminar shear strength as measured in short beam shear test, is discussed. The fabric composites were tested in three directions: at 0°, 45°, and 90°. In addition to the extensive efforts in elucidating the variation in the mechanical properties of noncrimp glass and carbon fabric reinforced laminates, the work presented here focuses, also, on the type of interactions that are established between fiber and epoxy matrix. The experiments, in conjunction with scanning electron photomicrographs of fractured surfaces of composites, were interpreted in an attempt to explain the failure mechanisms in the composite laminates broken in tension. POLYM. COMPOS., 2008. © 2008 Society of Plastics Engineers     

超细纤维及其纺织品

介绍超细纤维及其纺织品——仿麂皮、高密织物、洁净布的特点,制连方法和应用情况。超细纤维的制法主要有海岛法和复合分离法两种,所制成的仿麂皮、高密织物及洁净布是一种高技术、高附加价值的纺织品,具有广阔的发展前景,我国应大力研制开发。     

专用聚丙烯树脂PPH-Y35生产及应用研究

针对无纺布的应用特性,对专用聚丙烯树脂PPH-Y35生产工艺、性能进行了优化。利用专用生产聚丙烯树脂PPH-Y35装置,用高效催化剂氢调法、选取复合抗氧化剂生产出高质量的产品。将用PPH-Y35生产的无纺布与同类产品的性能对比,其性能优异,在医疗卫生领域中的应用更有优势。     

碳纤维增强聚丙烯复合材料的制备及性能

采用硝酸液相氧化法改性短切碳纤维(NCF),用以制备聚丙烯(PP)复合材料。以纤维含量和纤维种类为变量,通过万能力学试验机、熔体流动速率试验机、差示扫描量热、X射线衍射、扫描电子显微镜等研究它们对材料力学性能、流动性能、熔融温度以及结晶性能的影响。实验结果表明,纤维的含量影响纤维在基体中的分布,进而显著影响材料的性能,且含量在10%至20%区内时具有较好的增强效果;NCF与PP的界面具有更强的粘附力,这提升了复合材料的力学强度,降低了材料的断裂伸长率,降低了材料的熔融流动速率,提升了材料的结晶温度与结晶度,略微降低了材料的熔融温度;纤维含量与纤维种类均对材料的结晶晶型无明显影响。     

NiCoFe/C cathode electrocatalysts for direct ethanol fuel cells

A direct ethanol fuel cell (DEFC), which is less prone to ethanol crossover, is reported. The cell consists of PtRu/C catalyst as the anode, Nafion^® 117 membrane, and Ni–Co–Fe (NCF) composite catalyst as the cathode. The NCF catalyst was synthesized by mixing Ni, Co, and Fe complexes into a polymer matrix (melamine-formaldehyde resins), followed by heating the mixture at 800 °C under inert atmosphere. TEM and EDX experiments suggest that the NCF catalyst has alloy structures of Ni, Co and Fe. The catalytic activity of the NCF catalyst for the oxygen reduction reaction (ORR) was compared with that of commercially available Pt/C (CAP) catalyst at different ethanol concentrations. The decrease in open circuit voltage (V_oc) of the DEFC equipped with the NCF catalysts was less than that of CAP catalyst at higher ethanol concentrations. The NCF catalyst was less prone to ethanol oxidation at cathode even when ethanol crossover occurred through the Nafion^®117 film, which prevents voltage drop at the cathode. However, the CAP catalyst did oxidize ethanol at the cathode and caused a decrease in voltage at higher ethanol concentrations.     

Comparative study of magnetoelectric composite system Ba0.95Sr0.05TiO3–Ni0.8Co0.2Fe2O4 with ferrite prepared by different methods

In this paper, effect of addition of Ni_0.8Co_0.2Fe₂O₄ (NCF), prepared by three different methods namely solid state reaction method, sol–gel and co-precipitation, has been studied on microstructural, magnetic, dielectric, ferroelectric and magnetoelectric properties of multiferroic composite system 0.95 Ba_0.95Sr_0.05TiO₃–0.05 Ni_0.8Co_0.2Fe₂O₄. Ba_0.95Sr_0.05TiO₃ (BST) has been prepared by solid state reaction method. Titular representation of NCF samples prepared by sol–gel, co-precipitation, solid state reaction method is N–SG, N–CP, N–SS respectively and that of corresponding magnetoelectric composite is C–SG, C–CP, C–SS. X–ray diffraction analysis of the composite samples (C–SG, C–SS, C–CP) indicated the presence of both NCF and BST phases. Rietveld analysis of XRD pattern further confirmed the proper phase formation in the composite samples. Sol–gel and co-precipitation processes result in finer NCF particles as confirmed by Transmission electron microscopy (TEM). Sample N–SG possesses uniform particle size and shape. Magnetization versus magnetic field (M–H) loops of samples C–SS and C–CP possess respectively highest value of remanant magnetization and magnetic coercive field. Dielectric properties of BST, NCF and composite samples have been measured in the frequency range of 20 Hz–1 MHz and temperature range of 50–170 °C. The composite sample C–CP results in highest value of dielectric constant in comparison to samples C–SS and C–SG. Polarization versus electric field (P – E) measurements pointed that composite sample C–SG possesses highest value of remanant and saturation polarization and C–SS possesses lowest value of coercive electric field. The composite sample C–SS possesses highest value of magnetoelectric coefficient.     

Effect of titanate coupling agent on electromagnetic interference shielding effectiveness and mechanical properties of PC–ABS–NCF composite

Nickel-coated carbon fibers (NCF) treated with a coupling agent (CA) have been used for preparing composites of polycarbonate (PC) and acrylonitrile—butadiene—styrene (ABS) (90/10%) by melt blending. These composites have been evaluated for electromagnetic interference shielding effectiveness (EMI SE), mechanical properties, dispersion, and adhesion of the polymer to a filler using the scanning electron microscope (SEM). There is an improvement in the EMI SE, tensile strength, and impact strength of the composite when the carbon fiber is coupled with titanate CA. In loading NCF in composite, the optimum concentration of the CA Lica 38 used is about 2.0 phf combined with 1.5 phf calcium stearate (Ca.st.) (on the weight percentage of fillers); the composite can reach an SE of 50 dB by the coaxial transmission line test method.     

复合型陶瓷薄板的制备及其力学性能

作为一种轻薄、低能耗的功能化产品,陶瓷薄板因强度低而应用受限,如何对其进行低成本增强成为工业领域研究热点。本文以构筑“纤维布-黏结剂-陶瓷薄板”多层复合结构作为切入点,将多种工业级纤维布、黏结剂和陶瓷薄板进行二次后加工复合,制备了兼具低成本和优异力学性能的复合型陶瓷薄板,探究了其断裂面微观形貌及断裂机理。经研究表明,“碳纤维布-环氧树脂-陶瓷薄板”复合型陶瓷薄板具有最佳界面结合强度及力学性能,其抗弯强度和承载冲击能量分别为85.26 MPa和1.45 J,与陶瓷薄板坯体相比,性能提升幅度分别高达22.98%和141.67%。“纤维布-黏结剂-陶瓷薄板”多层复合结构能够有效提升陶瓷薄板综合力学性能,陶瓷薄板内部存在微裂纹拓展、纤维偏转等多种良性强韧化机制。     

玻纤增强基材的创新与发展

分析了当今下游复合材料工业的发展对玻纤增强基材发展的需要。重点介绍了风电叶片用玻纤纱、技术织物、复合织物、预浸渍制品、预成型增强体等各类玻纤增强基材以及增强热塑性塑料用的短切纤维、混合纱、LFT、GMT、GMT-D、LFT—D、增强热塑性片材等各类玻纤增强基材。并为玻纤增强基材如何促进这两类复合材料产品的发展提出建议。