正交设计法优化碳纤维表面连续镀镍工艺及性能

采用正交设计法,以镀镍碳纤维镀层电阻率为考察目标,对碳纤维表面连续电镀镍工艺参数进行优化。采用L9(33)正交试验对碳纤维表面进行电镀镍处理,电镀温度、电流密度、电镀时间作为3个因素。采用冷热循环法测试镀镍碳纤维镀层和碳纤维的结合力,采用X射线光电子能谱仪研究镀镍碳纤维镀层的元素组成及化学状态,采用电子万能材料试验机测试镀镍碳纤维的力学性能。结果表明:最优的碳纤维表面镀镍处理条件是:电镀温度50℃,电流密度0.5 A/dm2,电镀时间6min。镀镍碳纤维镀层和碳纤维是通过Ni—C—O键实现紧密结合的,部分表层金属镍被氧化生成了NiO。由于镀层的存在,使得镀镍碳纤维和树脂间的界面结合力发生了改变,从而导致镀镍碳纤维的力学性能有所下降。     

碳纤维表面电沉积合金(复合)镀层初步研究

采用电化学沉积的方法,在聚丙烯腈基碳纤维表面制备了Ni–Fe、Fe–P、Ni–B合金及Fe–Cr2O3复合镀层。结果表明:碳纤维表面的预处理对合金(复合)镀层与基底间的结合力有重要影响。扫描电子显微镜结果显示,未经活化处理的碳纤维表面镀层与基体的结合力差,表面有裂纹;表面活化处理后的镀层细致,均匀,结合力好。通过改变与合金元素相应的电解质浓度可改变镀层中合金元素的含量,获得具有不同合金含量的、与碳纤维结合紧密的合金或复合镀层。     

一种含Ni-P-SiC(二硼化钛)复合镀层的改性碳纤维及其制备和应用

正本发明公开了一种含Ni-P-SiC(二硼化钛)复合镀层的改性碳纤维及其制备方法和应用,该改性碳纤维由碳纤维及其表面的Ni-P-SiC复合镀层、Ni-P-TiB2复合镀层或Ni-P-SiC-TiB2复合镀层构成,其制备方法是将碳纤维表面依次进行去胶、粗化、中和、敏化、活化、还原及解胶预处理后,置于化学镀液中进行化学方法镀覆Ni-P     

碳纤维化学镀镍表面改性的初步研究

为提高碳纤维的电磁防护性能,以化学镀镍法对碳纤维进行表面改性。采用SEM及EDS对镀层进行了表征,测试了化学镀镍碳纤维的电磁屏蔽效果。结果表明:所得Ni-P合金镀层均匀,厚约1μm。正交排布的化学镀镍后的碳纤维在2～18GHz内的电磁波反射衰减达到-20dB。     

硬氧化表面镀层工艺在碳纤维生产设备中的应用

针对聚丙烯腈基碳纤维生产设备中传统硬化工艺铝合金配件存在的不足,采用硬氧化表面镀层工艺对铝合金配件进行表面处理,并从加工成本、使用寿命、配件质量以及对碳纤维原丝质量的影响等方面与传统硬化工艺配件进行比较。结果表明:采用硫酸硬质阳极氧化直流法对碳纤维生产中铝合金原丝托辊和络筒机导丝轮进行表面处理,处理后配件的表面粗糙度及表面硬度与传统硬化工艺配件的基本一致,可满足碳纤维原丝生产要求;硬氧化表面镀层工艺配件的使用寿命相比传统硬化工艺配件得到了很大提高,加工成本也大大降低,可以有效降低碳纤维原丝的生产成本;使用2种镀层工艺配件得到的碳纤维原丝的质量相近;在碳纤维原丝生产中,硬氧化表面镀层工艺配件完全可以替代传统硬化工艺配件。     

碳纤维表面化学镀铜工艺的优化

以甲醛为还原剂对碳纤维表面进行化学镀铜,利用正交实验对碳纤维化学镀铜工艺进行了优化,研究了施镀时间与镀层厚度及导电性之间的关系,确定了较理想的化学镀铜工艺。结果表明,采用优化后的碳纤维化学镀铜工艺制得的镀铜碳纤维镀覆均匀,光泽性好,镀层结合力强,导电性能显著提高。     

碳纤维表面化学镀Ni-Co-Fe-P工艺研究

介绍了碳纤维表面化学镀Ni-Fe-Co-P的工艺流程,探讨了碳纤维的去胶方法.通过正交实验法优化了化学镀Ni-Fe-Co-P的配方和工艺条件,观察了碳纤维的表面形貌,测试了镀层的结合力,研究了碳纤维增重率与时间和温度的关系.结果表明,在400℃灼烧30min,可去胶完全.本工艺得到的镀层均匀致密,结合力好.     

碳纤维表面无钯化学镀镍-磷合金镀层的性能分析

在碳纤维表面沉积了无钯化学镀Ni-P合金层,通过SEM、XPS、XRD和DSC等分析了Ni-P合金镀层的性能,用Weibull理论分析了Ni-P镀层对碳纤维单丝抗拉强度的影响.结果表明:用无钯化学镀的方法得到的Ni-P合金镀层均匀,结合强度高,耐氧化性好.当镀层厚度为0.15μm时,抗拉强度达到最大值3.11 GPa,是未镀的1.1倍.     

纳米碳纤维表面非晶态Ni-Fe-Ru-P合金镀层的制备与表征

在铁片试样上研究以次磷酸钠为还原剂的化学镀Ni-Fe-Ru-P合金镀层的工艺,考察了金属盐浓度对化学镀反应沉积速率的影响.利用优化的工艺配方在经过敏化,活化处理后的纳米碳纤维表面沉积Ni-Fe-_Ru-P合金镀层,分别利用EDS、XRD、SEM等手段对镀层的成分,结构,形貌进行了表征,并对其进行了热处理.结果表明,利用化学镀技术可以在纳米碳纤维表面获得连续、均匀的Ni-Fe-Ru-P合金镀层,且镀层为非晶态结构.在350℃以下热处理不会改变镀层的结构,在400℃以上热处理,镀层开始晶化.     

纳米碳纤维化学镀镍-铁-钴-磷合金镀层

在铁片试样上研究了化学镀Ni-Fe-Co-P合金镀层的工艺,利用此工艺在经过敏化、活化处理后的纳米碳纤维表面沉积出Ni-Fe-Co-P合金镀层。采用能量色散X射线谱(EDS)分析得出镀层成分,利用扫描电子显微镜(SEM)观察镀层形貌。结果表明,镀层的沉积速率随镀液中氯化镍质量浓度的增加而增加,随硫酸钴质量浓度的增加而降低;通过控制镀液中c(Co2 )/c(Ni2 )的比值,可控制沉积速率及镀层中镍、钴元素的相对含量;镀后的纳米碳纤维分散性好,获得了连续、均匀的Ni-Fe-Co-P合金镀层。     

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。     

Study on the Interfacial Behavior of Clay-Coated Carbon Fiber-Reinforced PEI Composites

In this article, based on the surface chemical treatment of carbon fiber, a clay coating process was developed for the surface modification of the carbon fiber to obtain a controlled interface between carbon fiber and polyetherimide (PEI) matrix in the composites system. SEM, XPS spectrum and contact angle measure reveal that the clay coating can improve the surface roughness of the carbon fiber surface for a favorable wettability with the matrix, which can also improve the interfacial adhesion of the composites. Experimental results show that the interlaminar shear strength (ILSS) and the three-point bending (TPB) of the composites reinforced by the carbon fiber coated with the clay have been enhanced.     

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。     

镀银碳纤维布的制备及其毫米波RCS特性

采用化学镀方法在碳纤维布表面沉积了金属银层.测量了利用优化工艺制得的镀银碳纤维布的表面电阻,并采用冷热循环法对镀层结合强度进行了测试,应用雷达散射截面(RCS)测试系统对同样尺寸的镀银碳纤维布及未改性碳纤维布的毫米波波段RCS值进行了测试.结果表明:得到的镀银碳纤维布镀覆均匀、金属光泽强,有较强的导电性能.镀银碳纤维布在毫米波波段的RCS值较未改性碳纤维布有很大增幅,且与理论值相近.     

Effect of corona discharge on the stability of the adhesion of thin silicone-organic coating to polyamide fiber surface made by the sol–gel method

This paper presents the effect of pretreatment of polyamide (PA6) nonwoven with corona discharge on the stability of the adhesion of thin hydrophobic silicone-organic coating based on vinyltriethoxysilane, made by the sol–gel method. This pretreatment with corona discharge causes a change in the physicochemical properties of the PA6 fiber surface. These changes include, among others, an increase in the fiber surface roughness, wettability, and surface free energy. At the same time, XPS and EDS investigations have shown an increase in the degree of oxidation and the formation of functional polar groups on the fiber surface (C–O–, C–OH, and O=C–O–). As a result of the changes in the surface properties of pretreated PA6 fibers, a higher degree of the sol deposition was obtained compared with that for untreated nonwoven surface. The assessment of the stability of the adhesion of thin hydrophobic coating to the fiber surface was carried out on the basis of changes in the content of silica deposited on fibers and the kinetics of water contact angle after washing and abrasion processes. In the end, the PA6 nonwoven, pretreated with corona discharge, shows a higher stability of the adherence of the thin silicone-organic coating and a higher degree of hydrophobicity than the untreated nonwoven.     

Improvement of corrosion protective performance of organic coating on low carbon steel by PEO pretreatment

Employing pretreatment is a pressing need for preparing anticorrosive coatings on carbon steels. However, conventional pretreatments are usually based on Cr, P and some other toxic elements, which are harmful to human body. For this reason, green and environmental techniques attract more and more attention. In this paper, plasma electrolytic oxidation (PEO) process was used as a pretreatment to fabricate an underlayer for the organic coating on low carbon steel. The anticorrosive performance of the organic coated samples with and without PEO pretreatment was studied by potentiodynamic polarization, ac/dc/ac electrochemical impedance spectroscopy, salt spray and immersion tests, respectively. Results show that the PEO process produces an oxide layer with porous and rough surface structure on the low carbon steel substrate. The porous and rough PEO layer is beneficial for enhancing the adhesion strength and thickness of the organic topcoatings. The organic coated sample with PEO pretreatment exhibits improved corrosion resistance and longer service life in corrosive environment compared to that without PEO pretreatment.     

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.     

聚乙烯塑料涂装工艺

聚乙烯塑料通常难以进行表面涂装。本文采用特殊前处理工艺改变塑料表面分子结构和表面粗糙度，提高涂层与塑料表面的结合力。提出了聚乙烯塑料前处理和涂装工艺，配方。