镀铜碳纤维布的制备及性能研究

为制备新型毫米波无源干扰材料,采用化学镀方法在碳纤维布表面沉积了金属铜层。测量了优化工艺条件下制得的镀铜碳纤维布的表面电阻,并采用冷热循环法检测了镀层的结合强度,应用雷达散射截面(RCS)测试系统测试了同样尺寸的镀铜碳纤维布及未改性碳纤维布的3mm波段RCS值。结果表明:镀铜碳纤维布镀覆均匀,金属光泽强,有良好的镀层结合强度及较强的导电性能。镀铜碳纤维布在3mm波段的RCS值较未改性碳纤维布有很大提高,且与理论计算值接近。     

不同改性方法对碳纤维布X波段雷达反射率的影响

采用化学镀镍和聚苯胺包覆分别对碳纤维布进行表面改性。表征了不同方法改性前后碳纤维布的表观形貌和导电性,并采用弓形法对碳纤维布在X波段的雷达反射率进行测试。结果表明,未改性、镀镍和聚苯胺包覆碳纤维布的电阻分别为24.2、22.6和60.6?。频率较低时,镀镍碳纤维布的雷达反射率低于未改性碳纤维布;在8~12 GHz全频段,前者的平均反射率比后者高22.35%。聚苯胺包覆碳纤维布在8~12 GHz全频段内的雷达反射率均小于改性前的碳纤维布,其平均反射率降低了104.71%。     

碳纤维布化学镀银工艺的优化

为制备新型无源干扰材料,采用化学镀方法在碳纤维布表面沉积金属银。研究了化学镀银液的配方组分及施镀温度、施镀时间等工艺参数对化学镀银碳纤维布增重率的影响,并研究了施镀时间与镀银碳纤维布导电性之间的关系。较理想的碳纤维布化学镀银工艺为10.5g/L硝酸银、100mL/L氨水、10g/L氢氧化钠、22.5g/L葡萄糖、50mL/L乙醇,施镀温度20°C,施镀时间10min。所得碳纤维布化学镀银镀覆均匀,光泽性好,镀层结合力强,导电性好。     

化学镀银的应用与发展

综述了化学镀银的沉积机理及其发展概况,主要包括:铜粉化学镀银,空心玻璃微球化学镀银,碳纤维布化学镀银,碳纳米管化学镀银,Yb2O3粉体化学镀银,高分子材料表面化学镀银等;并对化学镀银的应用进行了阐述.     

短切碳纤维复合材料对8mm波吸收性能研究

本文研究了不同长度和含量的短切碳纤维复合材料在8 mm波段(26.5~40 GHz)的吸收性能。结果表明,长度为3mm,含量为0.2%的短切碳纤维复合材料在该波段反射率均在-10 dB以下,具有优良的毫米波吸收特性;并探讨了短切碳纤维吸收毫米波的原因。     

碳纤维布化学镀铜工艺的研究

采用以甲醛为还原剂的化学镀铜液,用硝酸银作活化剂,在碳纤维布表面沉积出连续、均匀、有光泽的化学镀铜层。研究了不同前处理工艺对碳纤维布化学镀铜的影响。采用扫描电子显微镜表征了化学镀铜层的表面形貌,并用数字电压表测试了碳纤维布化学镀铜前后的导电性。     

一种混杂碳纤维布

本发明公开了一种混杂碳纤维布。本发明所提供的混杂碳纤维布,是沿所述碳纤维布的长度方向上间隔含浸有树脂。本发明采用部分含浸的方法,在纤维布上间隔含浸树脂,提高了纤维布的张拉强度和张拉的均匀性,并通过混杂PBO连续纤维布来控制碳纤维布的早期局部破坏和连锁性的断裂,吸收碳纤维布早期部分断裂所带来的冲击,使得混杂碳纤维布具有良好的张拉强度,可广泛应用于的构造物修复及加固。     

燃料电池碳电极制备-(1)碳电极分析

在本篇研究中将利用碳纤维布与奈米碳球进行燃料电池碳电极之制备.利用PAN系碳纤维布进行碳化、石墨化工程,并组装燃料电池进行测试,探讨碳化及石墨化对电池效能之影响.进而针对奈米碳球特性对碳纤维布进行活化工程,期能解决目前燃料电池碳电极效能不彰之问题.     

加固修复用碳纤维布力学性能试验值的研究

本文采用复合材料细观力学理论对碳纤维布抗拉强度、弹性模量和伸长率的理论值进行计算,证明了试验值的有效、可靠性;做出了碳纤维布力学性能指标的频率分布直方图,得到试验值集中分布在某一区域并总体呈分散分布的规律,为规范标准的制定提供了基础。     

新型网球球拍用碳纤维复合材料的制备与性能研究

采用浸涂法制备了新型网球球拍用S-E-碳纤维布/环氧树脂复合材料,对比分析了原始碳纤维布、E-碳纤维布和S-E碳纤维布的化学组成和表面形貌,研究了可溶性聚四氟乙烯含量对新型网球球拍用S-E-碳纤维布/环氧树脂复合材料表面接触角和耐磨性能的影响,并对新型网球球拍用S-E-碳纤维布/环氧树脂复合材料的耐酸碱性能进行了研究。结果表明,随着可溶性聚四氟乙烯含量的增加,原始碳纤维布/环氧树脂复合材料和新型网球球拍用S-E碳纤维布/环氧树脂复合材料的表面接触角都呈现出先增加而后减小的特征,在可溶性聚四氟乙烯含量为45%时取得表面接触角最大值;随着摩擦磨损周次的增加,新型网球球拍用S-E碳纤维布/环氧树脂复合材料的磨损量和表面接触角都呈现逐渐减小的趋势;新型网球球拍用S-E碳纤维布/环氧树脂复合材料在不同pH值溶液中都具有良好的耐化学腐蚀性能。     

氮化硼/碳纤维复合织物的性能研究

将氮化硼粉末负载于碳纤维织物上,用扫描电镜和紫外分光光度计观察和测试了氮化硼/碳纤维复合织物的表面形貌和紫外漫反射性能。结果显示:有大量氮化硼负载于碳纤维织物上;在250～600 nm波长范围,氮化硼/碳纤维复合织物的紫外漫反射性能比纯碳纤维织物的更好。用网络分析仪测试了氮化硼/碳纤维复合织物的电磁屏蔽性能,发现负载了氮化硼的碳纤维织物的电磁屏蔽性能略弱于纯碳纤维织物。     

Effects of electrophoretically deposited carbon nanofibers on the interface of single carbon fibers embedded in epoxy matrix

Electrophoretic deposition (EPD) was used to deposit carboxylic acid-functionalized carbon nanofibers (O-CNFs) on the surface of single carbon fibers. Using the single fiber fragmentation technique and Weibull analysis, interfacial shear strength (IFSS) was estimated for different fiber surface treatments. Samples for sized, unsized, O-CNF deposited sized, and O-CNF deposited unsized carbon fibers were tested. Additionally, the effects of EPD were investigated by testing sized and unsized carbon fiber samples exposed to an electric field in water. Removal of the fiber sizing decreased IFSS by approximately 27%, but addition of O-CNFs to the unsized fiber surface led to an increase of 15% compared to the sized base fiber. The O-CNF deposited sized fibers provided IFSS increases of 207.6% and 66.9% for 1 and 5 min deposition durations, respectively. The surface morphology of all samples was characterized, and those containing homogeneous deposition of closely bound O-CNFs provided the highest IFSS values. Exposing sized fibers to the electric field for 1 min led to an IFSS increase of 79%, while unsized fibers undergoing the same treatment provided increases of 7.7% and 46% compared to the base sized fiber and unsized fiber samples, respectively.     

Electro‐conductive cotton fabric prepared by electron beam induced graft polymerization and electroless deposition technology

Cotton fabric has been made electro‐conductive by electroless deposition of silver from its salt solution. Preparation process involved radical graft polymerization of glycidyl methacrylate monomer on plain woven cotton fabric using 10 kGy dose of electron beam irradiation, and then hydrazination of the epoxy ring of the monomer to introduce reducing agents into the fibre chemical structure. These reducing agents are sites for metal particle deposition. The chemical modifications were characterized by infrared spectroscopic studies. From X‐ray diffraction pattern analysis, the average size of these deposited silver metallic particles is 41 nm. These are observed as heterogeneous deposition on the fibre surface in scanning electron images. From thermogravimetric analysis, around 7.5% of the metal plated fabric weight is silver. The deposited silver nanoparticles make a conductive pathway through contact network, and this network brings a drop in average value of surface resistivity of the cotton fabric from 10⁹ Ω/sq to 3.63 Ω/sq for the metallised fabric. Such prepared electro‐conductive fabric showed very good wash durability of electrical conductivity up to 15 washing cycles when carried out as per ISO‐105‐C10:2006 (E) test no. A (1) standard, indicating firm adherence of silver nanoparticles to the fabric surface. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 44576.     

Preparation of multiscale graphene oxide‐carbon fabric and its effect on mechanical properties of hierarchical epoxy resin composite

Graphene oxide (GO) was used to modify the surface of carbon fiber layers through electrophoretic deposition, forming a multiscale reinforcement fabric. By adjusting the experimental parameters, the resulting GO‐carbon fabric showed productive and homogenous distribution of thin and less‐agglomerate GO platelets on carbon fiber surface, remarkably enlarging the surface area and roughness of carbon fabric. To investigate the effect of GO sheets on composites, GO‐carbon fabric and carbon fabric‐reinforced hierarchical epoxy resin composites were respectively manufactured. Mechanical tests demonstrated that after introducing GO flakes on carbon fabric, both the flexural strength and interlaminar shear strength of composite had achieved an increase, especially the interlaminar shear strength rising by 34%. Through fractography analysis, it was found that in pure carbon fabric‐reinforced epoxy composite, the fiber/matrix debonding fracture mechanism predominated, while after the GO decoration on carbon fiber surface, the composite featured a stronger interfacial bonding, leading to the enhancement in mechanical properties of hierarchical epoxy resin composite. POLYM. COMPOS., 37:1515–1522, 2016. © 2014 Society of Plastics Engineers     

活性炭纤维表面结构及其吸附银机理研究

用Ｘ射线光电子能谱（ＸＰＳ）等分析方法对剑麻基碳化纤维、磷酸化学活化纤维及其热处理纤维吸附Ａｇ＋前后的表面结构进行了研究,结果表明：活性炭纤维的氧化还原吸附性能不与其比表面积成正比,而受表面官能团影响很大,且还原吸附的纳米银与纤维的界面间除相互的物理作用外,还有Ａｇ－Ｏ－Ｃ配位键合存在;纤维还原能力强,但负载的纳米银与载体纤维之间的相互作用力并不一定大,而活化作用使纤维表面的Ｏ物种利于Ａｇ的成核和成键,促进Ａｇ－Ｏ－Ｃ的形成,使负载上的纳米银较稳定。     

Effect of deposited carbon nanotubes on interlaminar properties of carbon fiber‐reinforced epoxy composites using a developed spraying processing

Carbon fiber‐reinforced epoxy composites, with incorporated carboxylic multiwall carbon nanotubes (CNTs), were prepared using vacuum‐assisted resin infusion (VARI) molding, and the in‐plane and out‐of‐plane properties, including mode‐I (G_Ic) and mode‐II (G_IIc) interlaminar fracture toughness, interlaminar shear strength (ILSS), tensile, and flexural properties were measured. A novel spraying technique, which sprays a kind of epoxy resin E20 with high viscosity after spraying the CNTs, was adopted to deposit the CNTs on the surface of carbon fiber fabric. The E20 was used to anchor CNTs on the fabric surface, avoiding that the deposited CNTs were removed by the infusing resin during VARI process. The spraying processing, including spraying amount and spraying sequence, was optimized based on the distribution of CNTs on the fibers. After that, three composite specimen groups were fabricated using different carbon fiber fabrics, including as‐received, CNT‐deposited with E20, and CNT‐deposited without E20. The effects of CNTs on the processing quality and mechanical properties of carbon fiber‐reinforced polymer composites were studied. The experimental results show that all studied laminates have uniform thickness with designed values and no obvious defects form inside the laminates. Compared with the composite without CNTs, depositing CNTs with E20 increases by 24% in the average propagation G_Ic, by 11% in the propagation G_IIc and by 12% in the ILSS, while it preserves the in‐plane mechanical properties, However, depositing CNTs without E20 reduces interlaminar fracture toughness. These phenomena are attributed to the differences in the distribution of CNTs and the fiber/matrix interfacial bonding for different spraying processing. POLYM. COMPOS., 2013. © 2012 Society of Plastics Engineers     

碳纤维发热织物的电热性能研究

研究了以碳纤维为基质材料的发热织物的电热性能,通过改变碳纤维的排列以及外界的电学条件,观察发热织物的电阻、温度和发热时间等电热性能的变化情况。经过试验探索得到:碳纤维以交叉的方式排列、电源的功率为5 W时,可在较短的时间内使其织物表面温度达到53.7℃,持续发热6.8 h。通过试验还发现:碳纤维织物的通电时间长短以及断电的次数对碳纤维织物的电阻影响很微弱。     

Effect of a vacuum-deposited metal film on the CV of the Li insertion/extraction reaction at a graphitized carbon fiber electrode

A metal film of silver, copper, or gold was vacuum-deposited on the surface of mesophase pitch-based carbon fiber prepared at 3100 °C, and the Li insertion/extraction behaviour was examined by measuring the cyclic voltammogram (CV) for various film thicknesses in a non-aqueous electrolyte containing 1 M LiClO₄. The peak height of the CV was examined in detail for the deposited silver film. The peak height increased at first with increasing film thickness up to 150 Å, but then began to decrease. At around 200 Å, a minimum peak height which was nearly the same as that of the pristine sample was observed. The peak height then increased again up to a film thickness of 400 Å, where it was two times higher than that of pristine sample, then decreased gradually. Such a complicated CV could not be observed with a gold or copper film where the enhancing effect was monotonous and more remarkable with a thinner film. X-ray diffraction patterns of the silver film deposited on the carbon fiber showed a strong crystal orientation to the carbon substrate like epitaxial growth, which was found to be dependent on both the thickness and the deposition rate. The CV peak height correlated well with the silver crystal orientation, implying that the electrochemical reaction rate differs on different crystal faces. Such could not be found in the case of gold or copper. The peak enhancing effect and the cycle behaviour were elucidated in view of the nature of solid electrolyte interphase (SEI), conductivity, and the effect of alloy formation.