镍-聚四乙烯复合电沉积机理的研究

利用电化学测试方法研究了镍-聚四乙烯复合电沉积的过程.依据测试分析,提出了相关的物理模型和数学模型.并建立了PTFE粒子在镀层的覆盖度与电极过电位.微粒在镀液中悬浮量和拌搅拌强度等因素之间的关系式.揭示了PTFE与镍共沉积时电极过程的作用机理.     

镍-钼-磷/聚四氟乙烯复合电沉积工艺研究

在镍-钼-磷(Ni-Mo-P)合金电镀液中加入聚四氟乙烯(PTFE)制得了镍-钼-磷/聚四氟乙烯(Ni-Mo-P/PTFE)复合镀层.研究了镀液主要成份及工艺条件对复合镀层的影响,优选出一种较佳的工艺条件及复合镀液配方.由复合镀层性能测试结果发现,与Ni-Mo-P合金相比,由于PTFE的加入,提高了复合镀层的减摩性,但结合力与硬度略有下降.     

镍—钼—磷／聚四氟乙烯复合电沉积工艺研究

在镍－钼－磷（Ni-Mo-P)合金电镀液中加入聚四氟乙烯（PTFE）制得了镍－钼－磷／聚四氟乙烯（Ni-Mo-P/PTFE)复合镀层。研究了镀液主要成份及工艺条件对复合镀层的影响，优选出一种较佳的工艺条件及复合镀液配方。由复合镀层性能测试结果发现，与Ni-Mo-P合金相比，由于PTFE的加入，提高了复合镀层的减摩性，但结合力与硬度略有下降。     

聚氨酯泡沫表面电沉积镍工艺研究

采用化学镀镍、电沉积镍工艺在聚氨酯泡沫表面电沉积镍,研究了pH、电流密度、温度和沉积时间对镀层厚度和质量的影响.利用金相显微镜,扫描电子显微镜( SEM)和能量散射分光仪(EDS)对镀层横截面、表面形貌和成分进行了观察与检测.研究结果表明:镀液pH为4.2时镀层厚度最大为76 μm;镀层厚度随着电流密度的升高而增大,镀...     

纯铜表面镍硼合金涂层的制备

用化学沉积技术制备了Ni-B表面强化铜基材料,研究了表面涂层的显微组织、涂液的成分对镍硼沉积速率的影响及有关性能.结果表明,用化学沉积技术能在纯铜表面形成一层均匀、连续的镍硼硬化层,镍硼涂层的沉积速率由涂液中的NiCl2, KBH4, NaOH, 稳定剂和H2NCH2CH2NH2的浓度控制, 涂层是非晶态组织和少量过饱和镍固溶体的混合物,热处理后在涂层中析出Ni2B和Ni3B化合物,改善了铜的表面硬度和耐磨损性能,对铜的电阻率影响不大.     

纯铜表面镍硼合金涂层的制备

用化学沉积技术制备了Ni-B表面强化铜基材料，研究了表面涂层的显微组织、涂液的成分对镍硼沉积速率的影响及有关性能．结果表明，用化学沉积技术能在纯铜表面形成一层均匀、连续的镍硼硬化层，镍硼涂层的沉积速率由涂液中的NiCl2，KBH4，NaOH，稳定剂和H2NCH2CH2NH2的浓度控制，涂层是非晶态组织和少量过饱和镍固溶体的混合物，热处理后在涂层中析出Ni2B和Ni3B化合物，改善了铜的表面硬度和耐磨损性能，对铜的电阻率影响不大．     

电镀参数对电热法CCVD生长纳米碳的影响研究

采用直热电热法研究不同电镀参数对碳纤维表面生长纳米碳形貌的影响,在不同电镀参数下对碳纤维表面进行电镀镍处理,然后将其进行化学气相沉积,从而得到实验所制备的纳米碳;比较在电镀参数不同前提下由沉积工艺得到纳米碳的大小、形状,解释电镀参数对该工艺制备得到的纳米碳的影响原因。结果表明,电镀时间为3 min条件下,碳纤维表面得到的镍催化剂颗粒分布比较均匀。电镀镍均匀分布在碳纤维表面,具有合适的尺寸大小,能更好的沉积出纳米碳,不同形状的镍催化剂颗粒能在碳纤维表面上沉积出不同形貌的纳米碳。     

PTFE彩色薄膜的工艺研究及应用

本文介绍了PTFE彩色薄膜的性能、特点、应用,成型工艺,包括工艺流程,所用主要设备、工艺条件及产品规格和性能.经测试PTFE彩色薄膜的电气强度大于40kV/mm、拉伸强度大于25 MPa、薄膜材料的分解温度为386℃,推测了PTFE彩色薄膜的应用前景。     

远程氩等离子体对医用聚四氟乙烯表面灭菌与改性的研究

目的研究远程氩等离子体对医用聚四氟乙烯(PTFE)表面的灭菌及改性。方法通过载体定量灭菌实验测定远程氩等离子体对PTFE表面大肠杆菌的杀灭效果,并利用接触角测量、质量损失率计算和X射线光电子能谱分析(XPS)研究灭菌前后PTFE表面结构、性能的变化。结果在放电功率100 W,放电时间120 s,氩气流量20 cm3/min的条件下,远程及常规氩等离子体均可有效灭活大肠杆菌(GE≥3.769);但经远程氩等离子体灭菌后,PTFE表面的亲水性(水接触角为58.5°)明显优于常规氩等离子体灭菌后的PTFE表面(水接触角为70.5°),同时受损及降解程度低(表面质量损失率仅为11.8%)。远程氩等离子体可以在一定程度上抑制电子、离子的刻蚀作用,强化自由基反应,对PTFE表面的脱氟作用更强,从而引入更多的含氧基团。结论远程氩等离子体在有效杀灭大肠杆菌的同时,可使PTFE表面获得更好的改性效果。     

镍/聚四氟乙烯复合电镀新工艺的研究

利用电沉积方法制取了镍/聚四氟乙烯复合膜.研究了电流密度、温度、表面活性剂、预镀等因素对复合镀膜的影响,从而得取了最佳工艺条件,结果表明镀膜质量良好,耐磨性大大提高.     

Investigation on mechanism of the improvement in tribological properties of carbon fiber reinforced polytetrafluoroethylene composites by surface treatment

Tribological properties of polytetrafluoroethylene (PTFE) composites filled with differently surface treated carbon fibers (CF), sliding against GCr15 steel under dry sliding conditions, were investigated on a block-on-ring M-2000 tribometer. Experimental results reveal that rare earths (RE) surface treatment reduces the friction and wear of CF-reinforced PTFE (CF/PTFE) composites. Scanning electron microscopy (SEM) investigation of worn surfaces of CF/PTFE composites shows that cracks or pores are visible on the worn surfaces of untreated and air-oxidated composite, while no crack and very few pores present on the worn surface of REtreated composite. The fiber-friction-angling effect makes carbon fibers angled and oriented along the frictional shearing force, and finally parallel to the friction surface, which makes interfacial adhesion become a key factor to tribological properties of CF/PTFE composite. With strong interfacial adhesion between carbon fiber and PTFE after RE surface treatment, carbon fibers are not easily detachable from the PTFE matrix in the process of fiber-friction-angling, which prevents the rubbing-off of PTFE, and accordingly improves the friction and wear properties of the composite.     

Experimental study on frictional and sealing performances of packing rings in an oil-free gas compressor

To enhance the reliability and to extend service life of packing rings, tribological and sealing performances are investigated based on the experimental results. Friction force, leakage rate and power consumption of three materials of pressure packing seals are measured in a refitted vertical gas compressor. The rings are made of common filled polytetrafluroethylene (Filled PTFE), PTFE reinforced with 30% mass fraction carbon fiber (30%CF+PTFE), and carbon-carbon composites infiltrated with PTFE (C/C+PTFE), respectively. It is found that packing rings will periodically vibrate with the periodic vibration of pressure packing after the travel direction of motion abruptly turns to the reverse direction. Furthermore, the amplitude of vibration slows down with the increasing crank angle. Approximate value of friction force is available by multiple-point fast Fourier transformation (FFT) employed to process the experimental results by reducing the impact of vibration to a great extent. Of three materials of rings employed in experiments, Filled PTFE presents minimal leakage rate accompanied with maximum power consumption. And 30%CF+PTFE exhibits minimum friction power and moderate leakage rate. As for C/C+PTFE, its high mechanical and thermal properties are favorable factors to enhance the ability of operating under high pressure and velocity and to improve the wear resistance. Unfortunately, this also leads to a large leakage rate. Comprehensive consideration should be taken into to evaluate the availability, reliability and service life for a type of packing ring under dry running conditions.     

弹性金属氟塑料轴瓦表面摩擦的定向机理分析

通过对磨损后表面的显微观察与分析,发现了弹性金属氟塑料轴瓦（EMP）轴瓦与钢对摩时,其摩擦副两表面都存在转移或析出PTFE的高度定向现象,结合弹性金属氟塑料表层材料的表面分子结构特性,对其它向机理进行了研究。     

密封用填充改性PTFE的研究及应用

PTFE(聚四氟乙烯)的填充改性是近年来研究较多的项目。本文介绍了采用模压烧结工艺制备玻璃纤维和石墨改性的PTFE动态密封材料,并对其拉伸强度、压缩回弹性能和摩擦、磨损性能及耐磨机理做了系统的研究分析,结果表明,该密封材料具备较好的抗拉强度、优异的压缩回弹性能和较好的耐磨损性能,可用于对耐磨耗性、耐温性能要求较高的动态密封场合,具有广阔的应用前景。     

Tribological behavior of polytetrafluoroethylene coatings based on LY12 substrates in the space environment

The spacecraft space radiation environment was simulated by60 Co source. The polytetrafluoroethylene(PTFE) coatings were fabricated on LY12 substrates. And the effect of gamma(γ) irradiation on the tribological behavior of PTFE coatings under vacuum conditions was investigated. Results indicate that the radiation dose has insignificant effect on the friction coefficient of PTFE coatings, and the wear of PTFE coatings reduces with the increase of gamma dose. As the gamma dose was 100 kGy, the friction coefficient of the PTFE coatings first increased with the increase of sliding velocity and then decreased, and the wear of the PTFE coatings decreased with the increase of sliding speed. As the gamma dose was 100 kGy, the friction coefficient of the PTFE coatings first decreased with the increase of load and then increased, and the wear rate of PTFE coatings increased with the increase of load. Scanning electron microscope was utilized.     

岷江长滩河段航道整治试验研究

根据岷江长滩滩险碍航的特点,采用卵石动床模型进行整治方案研究,取得了良好的效果.本文简要介绍了长滩河工模型的模型设计、验证及方案试验情况.该工程现已竣工,经过几个水文年的检验,滩险航道的通航条件得到彻底改善,整治效果好,已通过工程验收,该工程被评为优良工程.     

镍／聚四氟乙烯复合电镀新工艺的研究

利用电沉积方法制取了镍/聚四氟乙烯复合膜，研究了电流密度、温度、表面活性剂、预镀等因素对复合镀膜的影响，从而得取了最佳工艺条件，结果表明镀膜质量良好，耐磨性大大提高。     

d区主要元素合金电镀的理论分析与实践

本文简述了d区主要元素合金电镀的意义;从电化学、络合物和原子结构、晶体结构等基本理论出发,以合金电镀实践为依据,对d区主要元素的合金电镀的可能性在理论上进行了较详细的分析与阐述,对铁族元素的过电位与d区主要元素共沉积的关系以及工艺参数对合金共沉积的影响也作了简要分析。本文还对d区主要元素的合金电镀实践提供了有力的例证。事实表明,对d区主要元素进行合金电镀在理论上和实践上都是可行的。