共查询到20条相似文献，搜索用时 171 毫秒
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孙志娟 《内蒙古科技与经济》2012,(2):71-72
本文采用20钢为基体,依据SiC添加量的不同,利用高速火焰喷涂技术制备出Fe-25Al/7SiC、Fe-25Al/1 1SiC、Fe-25Al/15SiC三种铁铝金属间化合物复合涂层,比较研究了涂层的抗冲蚀磨损行为.利用扫描电镜分析涂层冲蚀后的表面形貌.结果表明:Fe-Al/SiC复合涂层具有较好的抗冲蚀磨损性能,对基体可以进行有效的防护.其中,Fe-25Al/11SiC复合涂层的抗冲蚀磨损性能最优;在90°攻角冲蚀的情况下,涂层的冲蚀失重随着温度的升高而减少;增强相SiC和CeO2的添加有效地提高了涂层的抗冲蚀性能. 相似文献
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设计了射频磁控溅射技术在Ti6Al4V基体表面制备羟基磷灰石(HA)生物涂层的工艺,实验对涂层的显微结构及涂层与基体的界面进行了研究,对材料性能进行了初步探讨.结果表明磁控溅射技术制备的HA生物涂层,其沉积涂层速度快,涂层成分均匀,表面形貌良好,附着强度较高. 相似文献
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本文通过对国内外研究开发的耐磨自润滑涂层材料及涂层结构研究,表明选择适合于减磨HVOF喷涂的喷涂材料,设计出具有耐磨自润滑性能的涂层结构,对涂层性能的改善,设计具有优良性能的涂层具有重要的现实意义。 相似文献
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随着工业现代化和装备制造业的发展,对各种机械设备零部件的表面性能要求越来越高。为了提高各种机械零部件的可靠性,延长其使用寿命变得尤为重要。窗体底端对涂层残余应力的研究就是要深入分析各种涂层残余应力的大小和构成,以及发现材料、几何尺寸或者制备工艺等因素对涂层残余应力的影响规律,这些对涂层/基体系统的结构优化设计具有非常重要的指导意义。本文主要探讨涂层/基体系统的残余应力。 相似文献
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面对许多极端工况的油气装备管道腐蚀磨损防护的重大需求,本文围绕当前深地油井管涂层存在的耐温力学强度低和耐磨性能差的关键问题,以及原油生产过程中的蜡沉积造成的严重结蜡问题,以涂层表界面强化和组成—微观结构设计为突破点,通过将商业聚偏氟乙烯树脂(PVDF)和高度氟化的坡缕石@二氧化硅(Pal@SiO2-F)复合填料有机结合,制备了具有高耐磨性能的双疏功能填料,并开发了面向苛刻环境下石油化工装备用防腐耐磨双疏纳米粉末涂料。在涂层表面构建了独特的微/纳米分层结构,并与Pal@SiO2-F的低表面能及PVDF的化学惰性相协同,在涂层表面形成了稳定的气膜结构。所制备的涂层不仅具有优异的防腐耐磨性能,还对原油具有超强的抗粘附性能,将其应用于管道时可大幅提升原油运输效率。进而开发出防腐耐磨双疏涂层,该涂层在极端环境油气领域具有广阔的应用潜力。 相似文献
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本文对火电站锅炉过热器用钢钢研102、T91、TP347进行了高温氧化及模拟煤燃烧时碱金属硫酸盐（Na2SO4·K2SO4）沉积在金属表面而发生的热腐蚀进行了腐蚀动力学研究,并针对200MW发电机组常用的102钢采用表面喷涂Cr,C2-NiCrAl金属涂层以提高其热腐蚀抗力。结果表明,高温氧化性能TP347钢最好,氧化速率符合抛物线规律;而102钢的氧化速率几乎呈直线规律。热腐蚀实验中,3种整体材料腐蚀后的质量增加都接近直线规律,说明它们抗热腐蚀的性能都比较差,涂层能有效的隔离腐蚀介质,防止基体氧化和腐蚀。 相似文献
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Hydrogels—natural or synthetic polymer networks that swell in water—can be made mechanically, chemically and electrically compatible with living tissues. There has been intense research and development of hydrogels for medical applications since the invention of hydrogel contact lenses in 1960. More recently, functional hydrogel coatings with controlled thickness and tough adhesion have been achieved on various substrates. Hydrogel-coated substrates combine the advantages of hydrogels, such as lubricity, biocompatibility and anti-biofouling properties, with the advantages of substrates, such as stiffness, toughness and strength. In this review, we focus on three aspects of functional hydrogel coatings: (i) applications and functions enabled by hydrogel coatings, (ii) methods of coating various substrates with different functional hydrogels with tough adhesion, and (iii) tests to evaluate the adhesion between functional hydrogel coatings and substrates. Conclusions and outlook are given at the end of this review. 相似文献
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通过合理的涂料西方研制出具有较好工艺性能的超厚涂层水基锆砂粉涂料,用于大型铸钢件生产取得了较好的经济效益和环保效果。 相似文献
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Polydimethylsiloxane (DMS) is a popular material for microfluidics, but it is hydrophobic and is prone to non-specific protein adsorption. In this study, we explore methods for producing stable, protein resistant, tetraglyme plasma polymer coatings on PDMS by combining extended baking processes with multiple plasma polymer coating steps. We demonstrate that by using this approach, it is possible to produce a plasma polymer coatings that resist protein adsorption (<10 ng/cm2) and are stable to storage over at least 100 days. This methodology can translate to any plasma polymer system, enabling the introduction of a wide range of surface functionalities on PDMS surfaces. 相似文献
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涂层混凝土在应力腐蚀条件下氯离子渗透性能的变化是一个新的课题。本文利用自行设计的加载设备对混凝土保护涂层及涂层涂刷次数等不同情况下的氯离子渗透性进行了研究。研究表明,保护涂层减小了混凝土在应力腐蚀环境作用下抗弯强度的损失。同时也提高了混凝土的抗氯离子渗透性,而且随着保护涂层刷涂次数的增加这种优越性越明显。 相似文献
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针对1995-2016年间SCI核心数据库中有关“3D打印”主题的2769条文献记录,借助CitespaceIII科学知识图谱软件,选用“聚类”、“标志性文献”、“突发文献”和“突现关键词”四大指标,综合性探索3D打印的研究热点及其演化过程,并展望未来的3D打印研究热点。研究发现：(1)3D打印的研究热点最早出现在1993年,从2005年开始迅猛增长,在2013年出现高峰；(2)热点主要集中在“医疗支架、器官与药品”、“快速成型”、“增材制造”和“化学合成反应”等领域,也出现在“超声波固化”、“激光烧结”和“金属基复合材料”等技术层面；(3)“医疗领域”的相关研究出现最早,并且至今保持异常活跃；(4)“增材制造”、“3D生物打印”、“钛合金”与“化学合成反应”等是近年来最新兴的研究热点；(5)“商业化运营”和“与大数据等新兴技术的融合”等有可能成为未来的研究热点。研究成果可以促进3D打印相关理论的发展,为科研人员确定3D打印领域的研究重点和方向提供参考,为企业掌握市场竞争主动权和政府规划3D打印产业发展提供借鉴。 相似文献
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This paper presents a convenient strategy to modify the surface of whole-Teflon microfluidic chips by coating the channel walls with a thin layer of polydopamine (PDA) film, which is formed by oxidation-induced self-polymerization of dopamine in alkaline solution. Two coating strategies, static incubation and dynamic flow, are demonstrated and used for tuning the physical and chemical properties of the coated channel walls. The functionalized surfaces were investigated with the contact angle, X-ray photoelectron spectroscopy, and atomic force microscopy measurements. The coating time was optimized according to the fluorescent intensity of the green fluorescent protein immobilized on the modified surface. Applications of the PDA-modified Teflon microchips in bioanalysis were demonstrated with a typical sandwich immunoassay. Moreover, long-term cell culture experiments on modified and native Teflon chips revealed that the chip biocompatibility can be greatly improved with PDA coating. The results indicate that the surface properties of the Teflon can be easily controlled by the PDA modification, thus greatly expanding the application scope of whole-Teflon chips for various chemical and biological research fields. 相似文献
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复杂元器件上采用磁控溅射镀膜,薄膜与基片结合强度关系产品质量。从薄膜的附着机理入手,构建其结合力学模型。通过实验分析得出,附着力主要与附着类型、附着力的性质、工艺和测量方法有关。影响附着力的因素主要包括材料性质、基片表面状态、基片温度、沉积方式、沉积速率和沉积气氛等。掌握简单附着、扩散附着、通过中间层附着及宏观效应附着内容,通过选择基片能与薄膜形成化学键,清洗基片去除污染层,合理提高温度、加速扩散反应形成中间层等措施来提高附着力。此外,薄膜中存在的内应力通过合理调控工艺指标来消除和减小对薄膜和基片附着力的影响。 相似文献
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Walter Schrott Zdeněk Slouka Petr ?ervenka Ji?í Ston Marek Nebyla Michal P?ibyl Dalimil ?nita 《Biomicrofluidics》2009,3(4)
Electrokinetic properties and morphology of PDMS microfluidic chips intended for bioassays are studied. The chips are fabricated by a casting method followed by polymerization bonding. Microchannels are coated with 1% solution of bovine serum albumin (BSA) in Tris buffer. Albumin passively adsorbs on the PDMS surface. Electrokinetic characteristics (electro-osmotic velocity, electro-osmotic mobility, and zeta potential) of the coated PDMS channels are experimentally determined as functions of the electric field strength and the characteristic electrolyte concentration. Atomic force microscopy (AFM) analysis of the surface reveals a “peak and ridge” structure of the protein layer and an imperfect substrate coating. On the basis of the AFM observation, several topologies of the BSA-PDMS surface are proposed. A nonslip mathematical model of the electro-osmotic flow is then numerically analyzed. It is found that the electrokinetic characteristics computed for a channel with the homogeneous distribution of a fixed electric charge do not fit the experimental data. Heterogeneous distribution of the fixed electric charge and the surface roughness is thus taken into account. When a flat PDMS surface with electric charge heterogeneities is considered, the numerical results are in very good agreement with our experimental data. An optimization analysis finally allowed the determination of the surface concentration of the electric charge and the degree of the PDMS surface coating. The obtained findings can be important for correct prediction and possibly for robust control of behavior of electrically driven PDMS microfluidic chips. The proposed method of the electro-osmotic flow analysis at surfaces with a heterogeneous distribution of the surface electric charge can also be exploited in the interpretation of experimental studies dealing with protein-solid phase interactions or substrate coatings. 相似文献
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设计了适用于仿生机器人系统的离子型电活性聚合物柔性驱动器结构,采用溶胶-凝胶法制备新型离子液体聚合物凝胶,涂布法制备活性炭电极,并组装成柔性驱动器。利用扫描电镜表征驱动器的微观结构,结合循环伏安法分析电化学性能,根据应力-应变曲线求出杨氏模量。在分析驱动器致动机理的基础上,对其驱动性能进行测试,结果表明研制的新型柔性驱动器在仿生机器人领域有很好的应用潜力。 相似文献