碳纤维表面涂覆SiO2层的研究

溶胶—凝胶法在碳纤维表面涂覆抗氧化陶瓷层,工艺简单、可涂陶瓷种类广,是很有应用前景的涂覆工艺。本文研究了在碳纤维表面涂覆SiO_2的工艺及其对碳纤维性能的影响。结果表明涂覆SiO_2层后,碳纤维的强度基本上保持不变,且有效地提高了碳纤维的抗氧化性能。     

FC-4430/SiO2/PU复合疏水涂层制备及性能研究

具有疏水性表面的材料在自清洁、流体输送、减阻等领域具有潜在的应用价值。本文采用纳米Si O2粒子为添加剂,聚氨酯(PU)为成膜物,含氟表面活性剂(FC-4430)为低表面能修饰物,构筑出了微-纳米复合结构,采用涂刷工艺制备出FC-4430/Si O2/PU复合涂层。研究了Si O2和PU的质量比、FC-4430的用量对涂层疏水性能的影响。结果表明:在SiO2和PU的质量比为1:4,FC-4430的含量为1.5 mL时,复合涂层的疏水性能最好,水滴的接触角为127.6°。     

硝酸处理对碳纤维性能的影响

探讨了国产碳纤维表面硝酸处理及其对性能的影响。试验结果表明,碳纤维经65％浓硝酸表面处理后,其纵向抗拉强度有所提高。并用正交法选出了碳纤维表面硝酸处理的较佳工艺制度。     

碳纤维复合吸波涂层材料的性能影响研究

以水性聚氨酯为基,碳纤维为填料,制备了碳纤维复合吸波涂层材料。采用扫描电镜、差示扫描量热仪、傅里叶红外光谱仪、X射线衍射仪和矢量网络分析仪对碳纤维复合吸波涂层材料的结构与性能进行了测试和表征。实验结果表明:碳纤维复合吸波涂层材料为碳纤维和水性聚氨酯的物理结合,随着碳纤维含量的增加和厚度的增大,碳纤维复合吸波涂层材料的反射率峰值均向低频移动,当碳纤维含量为0.8%,涂层厚度为1.2 mm时,碳纤维复合吸波涂层的反射率峰值达到-6.01 dB,小于-5 dB的带宽为4.2 GHz,涂层面密度为1.02kg/m~2。     

碳纤维表面处理对碳纤维/NR复合材料性能的影响

试验研究碳纤维表面处理对碳纤维/NR复合材料性能的影响。结果表明,碳纤维经表面处理后表面沟槽加宽、加深,粗糙度增大,可改善其与橡胶基体的粘合性。与未处理碳纤维/NR复合材料相比,浓硝酸表面处理3h的碳纤维/NR复合材料的拉伸强度提高46%,耐磨性提高5%;300℃×20min高温氧化表面处理碳纤维/NR复合材料的拉伸强度和耐磨性均提高38%;浓硝酸处理1h后再加1.3份钛酸酯偶联剂的碳纤维/NR复合材料拉伸强度提高25%;碳纤维经浓硝酸处理1h后再进行表面浸胶,复合材料的耐磨性提高34%。     

一种碳纤维表面复合涂层的制备方法

<正>一种碳纤维表面复合涂层的制备方法,它涉及一种复合涂层的制备方法。本发明的目的是要解决现有方法制备的碳纤维复合材料中碳纤维与树脂基体之间存在弱界面现状的问题。方法:①碳纤维的预处理;②涂覆;③固化;④碳化;⑤涂层官能团化,即得到碳纤维表面复合涂层。优点:①复合材料的层间剪切强度分别提高了20%~70%;②与     

臭氧处理对碳纤维表面及其复合材料性能的影响

利用X射线光电子能谱(XPS)研究了碳纤维经臭氧(O3)氧化处理后表面元素组成及表面官能团的变化，结果发现，O3表面处理主要增加了碳纤维表面上的羟基或醚基官能团；研究了表面O3氧化处理对复合材料力学性能的影响，结果表明，碳纤维经O3氧化处理后明显改善了碳纤维与环氧树脂间的界面粘结，其复合材料的层间剪切强度明显提高。     

碳纤维涂层碳化硅高温抗氧化性能研究

碳纤维材料以其良好的性能,在树脂基、陶瓷基、金属基等复合材料中得到了广泛的应用,但高温下容易被氧化,并严重的限制了碳纤维的应用范围。本文利用扫描电镜、透射电镜、电子探针、X射线光电子能谱分析、热重分析等对涂层碳纤维进行了高温(800℃)抗氧化性研究,得到了涂层的成分为SiC,通过可控气氛炉得到涂层碳纤维800℃高温下失重率与时间呈现抛物线规律变化,同时与无涂层碳纤维的氧化失重曲线相比发现：此涂层碳纤维在高温下具有一定的抗氧化性。     

热处理对透明耐磨有机/无机复合涂层性能的影响

以有机硅氧烷为前驱体,采用溶胶-凝胶法结合流平法在PMMA表面制备有机／无机耐磨涂层,研究热处理温度和时间对涂层的硬度、抗划伤性及耐磨性的影响,利用Taber5151耐磨仪等手段分析表征涂层的性能。结果表明：涂膜后PMMA的透光性能仍保持良好;随着热处理温度提高和热处理时间的延长,涂层硬度、抗划伤性及耐磨性提高。     

环氧/碳纤维复合材料性能研究

本文主要分析了碳纤维帘子布复合材料的性能,并与T300单向碳纤维复合材料性能进行对比。结果表明,碳纤维帘子布复合材料性能低于T300单向碳纤维复合材料性能。     

Erosion resistant composite coating on rigid carbon fiber felt

Rigid carbon fiber felt (RCFF) was surface modified with a composite coating via a two-step technique of pasting and chemical vapor deposition. Scanning electron microscopy and X-ray diffraction were performed to analyze the microstructure of the substrate and the composite coating. The effect of the deposition time on solid particle erosion properties of RCFF modified by a composite coating was investigated. The pyrolytic carbon can decrease the surface porosity of a carbon fiber cloth, resulting in a dense composite. Compared with the substrate, the composite coating exhibited good erosion resistance and reduced the mass loss of the substrate by a factor of 19. The strengthening mechanism was discussed in this paper, and crack propagation along the interface between a carbon fiber and pyrolytic carbon sheath was found to occur; the crack propagation is an important factor for improving erosion resistance.     

碳纳米管对碳纤维复合材料导电性能的影响

针对在碳纤维表面沿径向生长一定量的碳纳米管后再与树脂基体固化成型为新型纳米复合材料的层合板,采用实验的方法进行对比分析,研究加入碳纳米管后对碳纤维复合材料导电性能所产生的影响。实验主要测量纵向和厚度方向的电导率,重点对比分析类型A(加入碳纳米管)和类型B(不加入碳纳米管)对纵向和厚度方向上的电导率的改善和影响。研究结果表明,加入碳纳米管后会显著提高碳纤维的纵向和厚度方向的电导率,增加幅度约为两个数量级。该实验研究对深入理解和确定纳米复合材料的导电性能和实时损伤监测方面将起到重要作用,为今后的工程应用奠定理论基础。     

Modification of the carbon fiber surface with a copper coating for composite materials with epoxy

Surface treatment of carbon fibers is essential to provide adequate interfacial interaction, and strength in carbon fiber/epoxy composites. The electrodeposition of a metallic copper coating on the carbon fiber surface has been examined as an alternative method to improve carbon fiber-epoxy interfacial properties. The wettability of the carbon fiber by the epoxy resin was improved as a result of copper electrodeposition. As a consequence, the adhesion between the carbon fiber and epoxy was also greatly improved by the surface electrolytic treatment used. The electrodeposition conditions affected significantly both wettability and adhesion phenomena. The electrolytic current had a strong effect on the interface performance. It was found that there was an intermediate electrolytic current, within the range used, which promoted better wetting and composite strength, compared with conventionally surface-oxidized carbon fibers.     

碳纤维面状发热材料的性能研究

本文研究了碳纤维面状发热材料在热压过程中的电性能变化以及在通电使用过程中电阻变化规律,结果表明：热压过程中,压力,温度及绝缘树脂的固化等对碳纤维面状发热体的电阻性能会产生影响,具有“压实搭接”的特性,压力对电阻起很重要的作用,其次是树脂的熔融固化过程,压制过程中导电纸电阻呈下降趋势,随通电时间的增加,碳纤维面状发热体的电阻趋于稳态化,具有恒功率的特征。碳纤维面状发热板具有远红外辐射特性,其波长在８     

高低温老化对碳纤维复合材料芯棒结构性能的影响

采用拉挤工艺制备了碳纤维增强环氧树脂基复合材料芯棒,并对其进行高低温人工加速老化试验,以及对老化前后碳纤维复合材料芯棒的横截面、外观颜色和密度进行了测试和分析。结果表明,高低温老化使芯棒颜色加深,主要对芯棒的外层产生一定的影响,内部结构没有明显变化;老化后芯棒的密度比老化前减小约2.5%,并且不同老化周期对芯棒的密度基本不变。     

电沉积铜-钨复合镀层的表面形貌和性能研究

用电沉积法在纯铜触头表面制备了铜-钨复合镀层.对复合镀层的表面形貌和主要使用性能进行了研究,结果表明:镀层表面组织均匀致密,具有良好的结合强度和适宜的硬度,相对于纯铜镀层而言,复合镀层有较好的抗氧化性能和耐电化学腐蚀性能.在电压12 V,电流分别为10、15、20和25 A,接触1×104次条件下,复合镀层的接触电阻在10～40 mΩ之间波动,可满足一些低压电器的使用要求.用SEM对不同电流下经1×104次电弧侵蚀后的复合镀层进行观测,发现其表面有明显的凹坑,孔洞等形貌特征.     

Preparation and properties of a simple super-hydrophobic carbon fiber composite surface

Super-hydrophobic surface is widely used in waterproof, antifouling, and anticorrosion fields because of its unique wetting characteristics. However, the rough structure of super-hydrophobic surface is easily damaged in service, which leads to the loss of various properties, making it difficult to apply super-hydrophobic surface on a large scale in actual production. In this paper, epoxy resin was used as adhesive, mixed with hydrophobic silica particles and sprayed on the surface of carbon fiber composites. After curing, the surface of super-hydrophobic carbon fiber composites with contact angle of 158 ± 2° and sliding angle of 1 ± 0.5° was formed. The surface had excellent dynamic water repellent performance, and the droplets could bounce more than three times on the surface. Furthermore, the super-hydrophobic surface had excellent wear resistance and mechanical stability. After the friction damage test, the surface structure of the sample was slightly damaged. The amount of wear was small, and the surface was still in super-hydrophobic state. Through soaked in solutions with different pH values, the microstructure of the surface was not obviously damaged by corrosion, the contact angle of water droplets was greater than 155°. The preparation method of super-hydrophobic surface of carbon fiber composite proposed in this study is simple and rapid, and the prepared surface has excellent performance, the practical application of super-hydrophobic surface is promoted.     

大丝束碳纤维复合材料力学性能研究

本文研究了大丝束碳纤维(48K)复合材料的常规力学性能及耐湿热性能，并与小丝束碳纤维(T300．3K)复合材料进行了对比，研究结果可为大丝束复合材料在航空器的次承力件或非承力件的应用提供技术基础。     

高精度碳纤维复合材料天线的研制

本文通过研究中温固化树脂基体、复合材料（FRP）铺层、成型及模具材料和模具设计等，研究并批生产了高精度碳纤维复合材料（CFRP）天线，其精度达到了0.031-0.057mmr.m.s。