电沉积Ni-Fe-ZrO_2复合电极工艺的研究

采用电沉积方法在铜箔上制备了Ni-Fe-ZrO2复合电极。研究了纳米ZrO2微粒的质量浓度、电流密度、温度、电沉积时间等工艺参数对复合电极析氢性能的影响。结果表明:在纳米ZrO2微粒10g/L,电流密度25mA/cm2,温度40℃,电沉积时间40min的条件下,可制备出具有最佳析氢性能的Ni-Fe-ZrO2复合电极。其析氢电位大于Ni-Fe合金电极的。     

复合电沉积铜-钨合金工艺及其机理的研究

分析了阴极电流密度、微粒的质量浓度、温度、搅拌速率等对铜-钨复合镀层中钨微粒的体积分数的影响。用扫描电镜观察正交优化工艺制备的复合镀层,结果表明:镀层电沉积结晶均匀、细致。此外,对复合电沉积铜-钨的过程机理进行了初步探讨,结果表明:在低电流密度条件下,铜-钨复合镀层的沉积遵循Guglielmi模型机理。     

复合电沉积工艺研究现状

对电沉积制备金属基复合镀层过程中各种工艺参数包括微粒粒径、微粒含量、搅拌强度、镀液pH值、电流密度、温度和表面活性剂类型等因素对镀层中复合微粒含量的影响的研究现状进行了综述。讨论了复合电沉积过程的可能的机理,指出了今后的发展方向。     

碳化硅微粒与铜复合电沉积过程模型试验

应用相似理论于复合电沉积研究中,同时考虑电化学因素和流体力学因素对复合电沉积过程的影响,建立了固体微粒与金属复合电沉积过程的模型。对碳化硅微粒与铜在酸性硫酸铜溶液中的复合电沉积过程,通过实验求出了关联式的有关参数。用导出的关联式关联碳化硅微粒的共沉积量,计算值与实验值吻合较好,误差最大不超过6%。     

复合电沉积的影响因素

根据国内外电沉积金属基复合镀层的研究结果,综述了微粒特性、镀液组成、工艺条件以及其它因素对复合电沉积的影响。提出今后应继续加强在复合电沉积机理方面的研究,以便更深刻、更准确地理解和掌握复合电沉积的各种影响因素,从而更好地对复合电沉积的工艺研究和应用给予指导。     

纳米微粒复合电镀的研究进展

通过纳米微粒复合电沉积技术可以赋予材料某些特殊性能,增加机械产品的使用价值和寿命,将纳米微粒技术引入传统的复合镀中不仅使产品质量产生质的飞跃,而且成本得以大幅度下降.综述了纳米微粒复合电沉积技术机理,性能特点,纳米粒子的分散方法及纳米微粒复合电镀的应用,提出了纳米微粒复合电镀有待解决的问题.     

Ni-Fe-TiO2复合镀层的制备及性能研究

采用复合电沉积技术制备了Ni-Fe-TiO2复合镀层.通过正交实验对复合电沉积工艺进行了优化,并对所得镀层的硬度、耐蚀性等综合性能进行了表征.结果表明:当TiO2的质量浓度为3g/L时,镀层的耐蚀性最好,硬度明显提高,此时TiO2微粒沉积在镀层中.     

电沉积制备铜基复合镀层的研究进展

兼具工艺成本低、工艺流程简单和工艺柔性好等优势的电沉积技术,是制备单元/多元金属基复合镀层的工艺方法。以电沉积制备铜-非金属化合物复合镀层和铜-金属微粒复合镀层为主题,选取制备工艺、参数条件优化及性能表征等方面作为切入点,分别进行概述。     

电沉积PbO2-WC-ZrO2复合电极材料的工艺研究

研究了不锈钢基体上复合电沉积PbO2-WC-ZrO2复合电极材料的工艺,并通过研究固体微粒的质量浓度及各种工艺参数对PbO2-WC-ZrO2电极材料的电化学性能的影响规律。为析氧反应的阳极用复合电极材料,确定了最佳配方及操作条件:硝酸铅250 g/L、硝酸15 g/L、WC 40 g/L、ZrO250 g/L、温度20℃、电流密度3.0 A/dm2,电沉积时间2.5 h。在此条件下,可获得PbO2-(7.55%)WC-(4.10%)ZrO2复合电极材料。     

Ni基金属微纳米颗粒复合涂层的研究进展

从镀层的电沉积工艺、镀层组织结构及性能特点等方面出发,综述了电沉积工艺参数对镀层组织结构和耐蚀性、耐磨性、电解析氢性能的影响,以及后续的热处理工艺对镀层组织及性能的影响。以Ni基金属复合颗粒镀层的电沉积机理和合金镀层的应用前景为出发点,提出了电沉积Ni基金属复合颗粒镀层的未来研究方向。     

Solid lubricant formulations containing starch-soybean oil composites

Starch-oil composites comprising purified foodgrade corn starch (PFGS) and soybean oil (SBO) were investigated as potential ingredients for water-based solid lubricant formulations. Current solid lubricants are almost exclusively petroleumbased and are used for protecting sheet metal and/or as sheet metal forming lubricants. Starch-oil composites are preferred ingredients for formulating solid lubricants because they are based on renewable and abundantly available raw materials and also have superior environmental and health characteristics. Steel sheets coated with the PFGS-SBO containing solid lubricant were evaluated for boundary coefficient of friction (COF) and wear properties using ball-on-flat test geometry. The COF was highly dependent on the SBO to PFGS ratio in the composite. In the absence of SBO, the COF was high (≈0.8) and decreased sharply with increasing SBO content to a minimum value of 0.07. Wear evaluation showed no scratches or lubricant transfer on the ball. There were also no wear tracks observed on the flat sheet before or after the solid lubricant was washed off. It was concluded that waterbased solid lubricants formulated with the PFGS-SBO starch-oil composite have acceptable friction and wear properties and should be evaluated further for use in sheet metal forming.     

An overview of fluoride-based solid lubricants in sliding contacts

The application of fluoride-based solid lubricants in wear resistant materials is increasing rapidly, especially in advanced materials that need to operate at elevated temperatures. However, a concise and consistent discussion on this important class of fluoride lubricants and their tribological characteristics in advanced materials is not available. This review aims to provide a comprehensive discussion on various fluoride solid lubricants used as additive in a composite material or as coatings at a wide range of operating conditions. A brittle-ductile transformation above ∼400 °C allows their lubricating nature. Furthermore, fluorides provide a synergistic effect if they react with other metallic or non-metallic compounds at high temperature. Finally, this article highlights the industrial applications of fluoride solid lubricants in wear resistant components.     

锡基复合镀层材料制备工艺的研究

探讨了应用于锌-镍电池负极集流体的锡基复合电镀工艺。通过SEM表征了材料的形貌,并将锡基复合镀层材料与普通光滑平面锡基材料进行物理性能及镀层致密性对比分析。结果表明:在相同工艺条件下,锡基复合镀层材料各项性能更加优异,更适用于高容量电池的制作。     

高温自润滑陶瓷复合材料研究进展

工作于高温环境中的陶瓷摩擦副,其润滑问题必须得到解决。由于传统润滑方法难以实施,研制具有自润滑性能的陶瓷或其复合材料无疑是一条很好的途径。本文综述了固体润滑剂、陶瓷以及陶瓷复合材料的高温干摩擦的研究现状。试图分析找出实现这一目标的途径。     

金属化合物超级电容器电极材料

金属化合物是理想的赝电容电极材料,但是其拥有导电性差且易团聚的缺点,使得电容性能显著下降。本文通过总结近年来的研究成果,阐述了金属化合物在超级电容器中的应用以及提高各类金属化合物电容性能的方法。研究表明,金属化合物与各类材料的复合、电沉积法、化合物结构的定向合成等多种方法均可有效提高金属化合物导电性,防止团聚现象的发生。随着金属化合物缺点的不断攻克,其在超级电容器的应用也将逐渐频繁起来,同时金属化合物赝也为新兴的储能元件注入了新的活力。     

Effect of solid lubricants on tribological behavior of glass fiber reinforced polyamide 6

The tribological properties of glass fiber reinforced polyamide 6 (GF/PA6, 15/85 by weight) and its composites filled with solid lubricants were investigated. The main purposes of this article were to study the hybrid effect of solid lubricants with glass fiber as well as the synergism of combined solid lubricants, the wear mechanisms were studied by SEM. The results showed that graphite impaired the tribological properties of GF/PA6, but the tribology behavior of graphite filled GF/PA6 composite could be significantly improved by polytetrafluroethylene (PTFE) or/and ultrahigh molecular weight polyethylene (UHMWPE), and the GF/PA6 composite filled with 5 wt % graphite, 5 wt % PTFE together with 5 wt % UHMWPE exhibited the lowest friction coefficient and wear rate, which was almost a reduction in friction coefficient by 37% and in wear rate by 34% contrast to GF/PA6. The effect of load was also studied, and the results showed that the friction coefficient was virtually not affected by load, while the wear rate all increased with increasing load. POLYM. COMPOS., 34:1783–1793, 2013. © 2013 Society of Plastics Engineers     

Ni-ZrO2复合镀层的腐蚀摩擦学性能研究

用电镀方法制得Ni-ZrO2复合镀层,研究电镀Ni-ZrO2复合镀层的结构以及其硬度、耐磨性、抗腐蚀性与电镀电流密度的关系。结果表明：复合镀层的显微硬度比纯镍镀层硬度成倍提高,复合镀层耐磨性比镍镀层提高20％以上;抗腐蚀性提高70％以上。X射线衍射结果显示,复合镀层由Ni及非晶ZrO2组成。Ni相为面心立方晶体结构,晶格常数为0．353nm,小于纯镍镀层,晶粒尺寸为23．8nm,大于纯镍镀层。     

峰值电流密度对脉冲电沉积Ni-Co-CNTs复合镀层机械性能的影响

研究了峰值电流密度对脉冲电沉积Ni-Co-CNTs复合镀层机械性能的影响。结果表明:当峰值电流密度升高时,镀层表面变得粗糙;随着峰值电流密度的增加,镀层中碳的质量分数先增加后下降,当峰值电流密度为80 A/dm~2时,镀层中碳的质量分数达到最大值;镀层的显微硬度和抗拉强度均在峰值电流密度为100 A/dm~2附近时达到其最大值,且高于直流电沉积时所得镀层的显微硬度值和抗拉强度值。说明采用脉冲电沉积工艺可以提高镀层的机械性能。     

润滑剂对PE木塑复合材料力学性能和加工性能的影响

本文讨论了两种润滑体系在PE木塑复合材料中的应用，测试了材料的力学性能和加工性能。结果发现，润滑剂需用量要约2％、并保持物料较快塑化、形成较大的挤出压力，才能使PE木塑复合材料获得较高的挤出速度和较好的外观质量，产品的力学性能则基本不受润滑剂品种的影响。