PTFE浓度对电厂冷却水管Ni-Mo-PPTFE复合镀层形貌和防垢性能的影响

采用单因素实验法研究PTFE浓度对电厂冷却水管常用的20#钢表面Ni-Mo-P/PTFE镀层的形貌和防垢性能的影响.结果表明,不同PTFE浓度下复合镀层的形貌特征既存在相似之处也存在差异.在5～20 mL/L的范围内随着PTFE浓度增加,复合镀层平整度提高,生垢速率减小,主要归因于复合镀层中PTFE质量分数逐渐升高.但当PTFE浓度超过20 mL/L,随着PTFE浓度继续增加,复合镀层平整度和防垢性能有所下降.PTFE浓度为20 mL/L时,该复合镀层表面较为平整,PTFE质量分数达到3.19％,具有相对较好的防垢性能.     

电厂冷却水管化学镀Ni-Co-P/PTFE复合镀层及其防垢耐蚀性能

在电厂冷却水管常用的20#钢表面化学镀Ni-Co-P镀层,并以沉积速率作为指标,通过单因素实验得到化学镀Ni-Co-P镀层较优的溶液成分和工艺条件.在此基础上,通过向溶液中添加PTFE制备出Ni-Co-P/PTFE复合镀层,进一步研究了PTFE浓度对Ni-Co-P/PTFE复合镀层防垢耐蚀性能的影响.结果表明,随着PT...     

高性能氟碳涂料的制备及其综合性能研究

以含氟乙烯/乙烯基单体共聚氟树脂(FEVE)为基料,Ti O2/Al2O3复合颗粒为主要耐磨增硬填料,协同聚四氟乙烯(PTFE),制备了高性能氟碳涂料,并对涂层综合性能进行了测试。结果表明:当体系的颜料体积浓度(PVC)为30%,Ti O2/Al2O3复合颗粒含量为14%,PTFE含量为6%时,涂层的硬度和耐磨性达到最佳,且具有良好的疏水性和耐候保光性,同时常规理化性能优异。     

聚合物基疏水/超疏水涂层防垢的研究进展

聚合物基疏水/超疏水涂层因具有较低的表面自由能、优良的粘结性及化学稳定性,在防垢方面具有重要的应用前景。主要围绕"聚合物基涂层",综述了环氧树脂、聚苯硫醚(PPS)、聚四氟乙烯(PTFE)及全氟聚醚(PFPE)等疏水/超疏水涂层在防垢方面的研究进展。展望了其在防垢中面临的挑战以及进一步需要研究的工作。     

聚合物基疏水/超疏水涂层防垢的研究进展

聚合物基疏水/超疏水涂层因具有较低的表面自由能、优良的粘结性及化学稳定性,在防垢方面具有重要的应用前景。主要围绕"聚合物基涂层",综述了环氧树脂、聚苯硫醚(PPS)、聚四氟乙烯(PTFE)及全氟聚醚(PFPE)等疏水/超疏水涂层在防垢方面的研究进展。展望了其在防垢中面临的挑战以及进一步需要研究的工作。     

憎水性Ni-PTFE复合镀层的制备及其摩擦磨损性能的研究

采用复合电镀法制备Ni-PTFE复合镀层,考察了表面活性剂、电流密度、pH值和镀液中PTFE添加量对复合镀层中PTFE含量的影响.并进一步研究了镀层中PTFE含量对复合镀层硬度、摩擦磨损性能和憎水性能的影响.结果表明,最佳工艺条件下制备的复合镀层具有良好的憎水性和优异的摩擦磨损性能.     

氧化石墨烯/聚偏氟乙烯复合涂层的机械性能与防腐性研究

采用改进Hummers法合成氧化石墨烯,经旋涂制备氧化石墨烯/聚偏氟乙烯复合涂层。利用原子力显微镜(AFM)、红外光谱(FT-IR)表征氧化石墨烯;测定了复合涂层的机械性能,并借助扫描电子显微镜(SEM)观察断口形貌;同时测试了复合涂层的防腐性能。结果表明,氧化石墨烯片层为单层且含有大量含氧官能团;复合涂层的机械性能和防腐性能都随氧化石墨烯含量的增加呈现先增后减的趋势。当氧化石墨烯含量为0.5%时,复合涂层的拉伸强度和断裂伸长率达到最大值(分别为83.63 MPa和389%),分别比纯聚偏氟乙烯膜高25%和31%;同时复合涂层的防腐性能最佳,比纯聚偏氟乙烯涂层的阻抗模值高1.4个数量级。     

聚酰胺酰亚胺复合涂层的制备及摩擦磨损性能研究

以Q235钢作为基体材料,采用喷涂的方法制备了耐温耐磨聚酰胺酰亚胺(PAI)涂层材料。利用MMW-1型万能摩擦磨损试验机研究了SiC及聚四氟乙烯(PTFE)含量对PAI涂层摩擦学性能的影响,同时对PAI涂层进行了TG热性能分析。结果表明:当SiC含量为10%(质量分数)、PTFE含量为0.8%(质量分数)时,PAI涂层摩擦学性能达到最优;TG曲线表明制备的PAI涂层热失质量温度在350℃以上;PAI涂层在250℃保温1 h后,表面无气泡、剥落及裂纹等缺陷。     

填料对环氧树脂-粉煤灰涂层性能的影响

制备了粉煤灰-EP复合板材的涂层材料,探讨了粉煤灰含量由20份增加到60份,分别在不添加其他填料、添加60份Al(OH)_3以及添加60份Al(OH)_3和10份PTFE三种情况下,涂层性能的变化趋势。结果表明:粉煤灰含量由20份增加到60份,涂层的热导率和表面硬度变化不大,附着力增加了31.8%;添加60份Al(OH)_3,涂层的热导率变化不大,表面硬度同比提高了22.2%~24.6%,附着力同比提高了38.5%~55.8%;继续添加10份PTFE,涂层的热导率随粉煤灰含量增加而大幅增加,表面硬度同比又提高了6.6%~10.4%,附着力同比又提高了27.2%~35.0%。另外,涂层仅含粉煤灰填料时,其耐酸性略差,加入60份Al(OH)3时耐酸性略有改善,继续加入10份PTFE后耐酸性进一步改善,而各种填料对涂层耐碱性影响不大。     

钕铁硼化学镀防护及在模拟海洋大气环境中的腐蚀行为

采用化学镀方法在钕铁硼表面分别制备Ni-P合金镀层、Ni-Mo-P合金镀层、Ni-P/PTFE复合镀层和Ni-Mo-P/PTFE复合镀层,并研究了不同化学镀层在模拟海洋大气环境中的腐蚀行为。结果表明:Ni-P合金镀层、Ni-Mo-P合金镀层、Ni-P/PTFE复合镀层和Ni-Mo-P/PTFE复合镀层都完整覆盖钕铁硼表面,它们的粗糙度差别不大,在模拟海洋大气环境中的腐蚀失重都低于钕铁硼的腐蚀失重,容抗弧半径增大且电荷转移电阻有不同程度的提高。与Ni-P合金镀层和Ni-Mo-P合金镀层相比,Ni-P/PTFE复合镀层和Ni-Mo-P/PTFE复合镀层具有优良的耐腐蚀性能,原因在于PTFE颗粒较均匀的沉积在镀层表面增加一道屏蔽层,也起到阻碍腐蚀介质渗透腐蚀的作用。尤其是Ni-Mo-P/PTFE复合镀层,其表面更致密,PTFE颗粒沉积更均匀,能更有效延缓腐蚀介质与钕铁硼接触,显著提高钕铁硼在模拟海洋大气环境中的耐腐蚀性能。     

复合电沉积(Ni-W)-PTFE工艺的研究

通过电沉积方法制得了(Ni-W)-PTFE复合镀层并研究了钨酸钠质量浓度和PTFE复配液质量浓度对复合镀层的成分及性能的影响。结果表明,钨酸钠质量浓度提高,镀层中钨的质量分数以及镀层的耐蚀性都有提高,PTFE复配液质量浓度提高会使镀层的摩擦系数降低,使镀层自润滑性得到改善。     

溶胶-凝胶法制备PTFE/SiO2疏水涂层

以聚四氟乙烯乳液(PTFE)和纳米硅溶胶为主要原料通过溶胶-凝胶法在玻璃表面上制备了疏水涂层。水滴在表面的接触角达到126°。通过显微电镜观察涂层表面结构,发现涂层表面分布许多微米大小的乳突。聚四氟乙烯低的表面能和复合表面的微米乳突结构是涂层能形成良好疏水性能的原因。考察了聚乙烯醇对复合涂层疏水性的影响。     

(Ni-P)-纳米Al2O3-PTFE化学复合镀层的性能研究

在化学镀Ni-P合金镀液中添加纳米Al2O3及PTFE获得(Ni-P)-Al2O3-PTFE复合镀层.研究了纳米Al2O3及PTFE对镀层硬度、磨损及减摩性能的影响.结果表明:纳米Al2O3及PTFE的加入能提高Ni-P合金镀层的硬度、耐磨及减摩性.     

环氧树脂防粘涂料的研究

研制了一种以环氧树脂为基料,聚四氟乙烯为防粘剂,二硫化钼为润滑剂的常温固化防粘涂层。通过正交实验与极差分析,对涂层性能作了较为深入的研究,筛选出最优的涂料配方。结果表明,该涂层具有优良的防粘性,硬度和附着力。     

Modification of Cu‐PE‐PTFE composite coatings on rubber surface by low‐energy electron beam dispersion with glow discharge

Polytetrafluoroethylene (PTFE) composite coatings doped with copper acetate and polyethylene (PE) were fabricated on rubber substrate by electron beam dispersion technique. The effects of dopant nature and glow discharge treatment on morphology, structural and tribological properties of the coatings were investigated. The results showed that Cu and PE doping change the surface structure of PTFE‐based composite coatings due to the chemical reactions between the dispersion products. Cu‐PE‐PTFE coatings show the columnar and layered growth models without and with discharge treatment. Cu adding decreases the crystallinity, branched degree and unsaturated degree of PE coatings, but increases the branched degree and unsaturated bonds in the PE‐PTFE coatings. Glow discharge enhances the crystallinity and ordering degree of composite coatings. Friction experiments indicated the significant difference of composite coatings in the nature of their destruction during friction. PE‐PTFE coating is characterized of the brittle fracture with clear failure boundaries but Cu‐PE‐PTFE coating shows a rough surface without cracking and delaminating after friction. Cu doping increases the dynamic coefficient of friction of PE and PE‐PTFE composite coatings, but discharge plasma decreases the dynamic coefficient of friction. Cu‐PE‐PTFE composite coating after discharge treatment has the decreased dynamic coefficient of friction and improved wear resistance. POLYM. ENG. SCI., 58:103–111, 2018. © 2017 Society of Plastics Engineers     

Tribological properties of the polyacrylate/PTFE coating modified by POSS in the space environment

The irradiation conditions in the low earth orbit (LEO) severely inhibit the development of polymeric materials for solid lubrication coatings used on the external surfaces of spacecraft. To solve the problem, octavinyl polyhedral oligomeric silsesquioxanes (OvPOSS) were covalently grafted onto poly(methyl/butyl methacrylate) composites (PMB). The results showed that the appropriate incorporation of OvPOSS (10 wt %) significantly reduced the friction coefficient and improved the wear resistance of the OvPOSS/PMB composite coatings. Furthermore, the impact of OvPOSS on the tribological properties of PMB/polytetrafluoroethylene (PTFE) lubrication coatings in the space environment was investigated. In particular, the degradations, mass losses, surface morphologies, and chemical compositions of POSS/PMB/PTEF composite coatings were characterized under ultraviolet (UV), electric irradiation (EI), and atomic oxygen (AO). The results indicated that OvPOSS provides numerous Si O Si bonds in the polymer matrix that improve the resistance to UV and EI. Besides, a passivating SiO₂ layer was formed to prevent further erosion and degradation of the underlying PMB and PTFE components during AO irradiation. Particularly, the wear resistance of OvPOSS/PMB/PTFE coatings under AO irradiation increased significantly compared with the pristine PMB/PTFE coating. Overall, our results indicate that POSS-containing composites are a good prospective material for space application in the LEO. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48730.     

工艺条件对电沉积RE-Ni-W-P-SiC-PTFE复合镀层性能的影响

研究了电流密度，镀液温度、pH值和PTFE等对电沉积RE-Ni-W-P-SiC-PTFE复合镀层性能的影响。结果表明，镀态下镀层的硬度在420-550Hv之间，当镀液中PTFE浓度为25ml/L时，磨损量最小，但镀层的耐蚀性却最差；而当镀液中PTFE浓度为30ml/L时，则具有良好的综合性能。     

电子束辐射对PTFE/GF摩擦磨损和压缩性能的影响

考察电子束辐射对玻璃纤维增强聚四氟乙烯(PTFE/GF)摩擦磨损性能和压缩性能的影响。结果表明,经电子束辐射后,PTFE/GF的耐磨性能和压缩性能均显著提高。当电子束辐射剂量为300 kGy时,PTFE/GF的耐磨性能提高了1.83倍,压缩弹性模量提高了0.8倍。分析认为,由电子束辐射引发的PTFE结晶度的提高使得PTFE/GF具有良好的耐磨性能和压缩性能。     

增强耐磨改性尼龙6的研制

本文研究了PA6/PTFE/GF共混体系性能与组成比的关系.讨论了PTFE的品级,GF的种类及共混工艺对共混物性能的影响.通过用Cr及PTFE填充改性,使改性尼龙6的力学性能和耐磨性均得到有效的改善.该共混物材料的性能指标接近国外同类产品的水平.     

Effect of MoS2/PTFE coatings on performance of Si3N4/TiC ceramics in dry sliding against WC/Co

To enhance the tribological performance of Si₃N₄/TiC ceramics, MoS₂/PTFE composite coatings were deposited on the ceramic substrate through spraying method. The micrographs and basic properties of the MoS₂/PTFE coated samples were investigated. Dry sliding friction experiments against WC/Co ball were performed with the coated ceramics and traditional ones. These results showed that the composite coatings could significantly reduce the friction coefficient of ceramics, and protect the substrate from adhesion wear. The primary tribological mechanisms of the coated ceramics were abrasive wear, coating spalling and delamination, and the tribological property was transited from slight wear to serious wear with the increase of load because of the lower surface hardness and shear strength. The possible mechanisms for the effects of MoS₂/PTFE composite coatings on the friction performance of ceramics were discussed.