电刷镀／纳米级WC镀层修复机械设备磨损件的工艺研究

本文阐述了镍基纳米碳化钨复合电刷镀镀液的研制方法：制定了镍基纳米碳化钨复合电刷镀工艺优化过程；分析了镍基纳米碳化钨复合电刷镀镀层的微观组织、性能与强化机理；介绍了镍基纳米碳化钨复合电刷镀技术在机械设备维修中的应用。     

纳米微粒增强镍基复合镀层的研究进展

综述了纳米微粒增强镍基复合镀层的研究进展。纳米微粒增强镍基复合镀层具有致密的组织结构和优良的综合性能,潜在应用前景广阔。解决目前纳米微粒增强镍基复合镀层制备中存在的难题,将推动纳米微粒增强镍基复合镀层的研究向深层拓展。     

船用柴油机活塞杆表面微粒增强镍基复合镀层的制备及其性能分析

采用电沉积方法,在船用柴油机活塞杆表面分别制备纳米微粒增强镍基复合镀层、亚微米微粒增强镍基复合镀层和微米微粒增强镍基复合镀层。分析了三者的显微形貌、晶相结构及磨痕形貌,并测定了硬度。结果表明:与亚微米微粒增强镍基复合镀层和微米微粒增强镍基复合镀层相比,纳米微粒增强镍基复合镀层的外观显得更加光亮,硬度接近5 800 MPa。     

镍/纳米二氧化硅纳米复合镀层耐腐蚀性能的研究

制备了纳米氧化硅镍复合镀层材料,并利用静态浸泡法对纯镍镀层和由镀液中不同微粒含量制备的复合镀层样品的耐蚀性能进行了研究,讨论镀液中纳米微粒含量对镀层抗蚀性能的影响。并用扫描电镜观察镀层的表面形貌。     

Ni-纳米SiO2复合镀层耐蚀性的初探

制备了纳米氧化硅—镍复合镀层材料，并利用静态浸泡法对纯镍镀层和由镀液中不同微粒含量制备的复合镀层耐蚀性能进行研究，讨论了镀液中纳米微粒含量对镀层抗蚀性的影响，并用扫描电镜观察镀层的表面形貌。     

镍基SiC纳米微粒复合电镀研究

以镀层中SiC复合量为参考标准,通过正交试验,考察了SiC纳米微粒、电流密度、pH和空气流量四个因素对SiC复合量的影响,发现镀液中的SiC纳米微粒质量浓度对复合量影响最大。根据正交试验结果得出镍基SiC纳米微粒复合电镀的最佳工艺条件。在最佳工艺条件下,对Ni-SiC复合镀层表面形貌和能谱进行分析。     

含纳米粉镀液的电刷镀复合镀层试验研究

应用电刷镀技术制备了含有纳米SiC粉的镍基复合镀层，对该复合镀层的显微硬度和摩擦学性能进行了测试，并讨论了主要工艺参数对这些性能的影响规律。测试结果表明：纳米SiC粉的加入可以一定程度的提高复合镀层的硬度。快镍复合纳米SiC镀层的摩擦因数低于快镍镀层的摩擦因数。镀液中纳米SiC粉和添加剂浓度增加时，复合镀层的摩擦因数有降低趋势。与快镍镀层相比，快镍复合纳米SiC镀层的耐磨性有较大幅度的提高。还采用光学显微分析(OM)和电子探针(EPMA)研究了对该复合镀层的表面形貌、组织和元素分布特点，并提出了纳米SiC粉与镍共沉积的机理。     

镍-磷-纳米颗粒化学复合镀的研究现状及发展

综述了近年来镍-磷-纳米颗粒化学复合镀的研究情况。阐述了镍-磷-纳米颗粒化学复合镀的机理、镀液中各成分的作用、纳米颗粒的分散、纳米复合镀层的结构和性能。指出了纳米化学复合镀在今后的研究方向———纳米颗粒的分散和功能性复合镀层。     

镍—磷—纳米颗粒化学复合底的研究现状及发展

综述了近年来镍-磷-纳米颗粒化学复合镀的研究情况。阐述了镍-磷--纳米颗粒化学复合镀的机理，镀液中各成分的作用，纳米颗粒的分散，纳米复合镀层的结构和性能。指出了纳米化学复合镀在今后的研究方向-纳米颗粒的分散和功能性复合镀层。     

镍基纳米复合镀层的研究现状

镍基纳米复合镀层中由于复合纳米颗粒的特性而被广泛应用。就国内外镍基纳米复合镀层的研究现状进行了分析,对镍基纳米复合镀层的沉积机理、镀层结构特点、影响纳米颗粒与镍金属电沉积的主要工艺因素、镀层性能及应用进行了阐述。当前具有更优良硬度、耐磨性、耐腐蚀性、减摩性、催化功能和抗高温氧化性的镍基纳米复合镀层是行业的研究热点。对镍基纳米复合镀层的研究还属于初步阶段,理论研究还需进一步深入。     

纳米SiC化学复合镀镍工艺的研究

通过对Ni-B-纳米SiC及Ni-P-纳米SiC化学复合镀工艺的研究,发现纳米碳化硅微粒的共沉积对复合镀层的结构有影响,非晶态的合金镀层在纳米微粒共沉积的条件下向晶态结构转变,复合镀层基体以镍的晶态形式出现.通过镀覆工艺参数的调节,控制复合镀层基体结构,促使其逐渐向非晶态过渡.结合XRD、电子探针等检测手段,探讨了影响这一结构变化过程的工艺因素及其内在机制.     

ATO/APU纳米复合透明隔热涂料的制备与性能研究

以纳米氧化锡锑(ATO)水性浆料为隔热材料,水性聚氨酯树脂(APU)为成膜物质制备出ATO/APU纳米复合透明隔热涂料。对悬浮ATO粒子的分散稳定性、ATO/APU复合涂膜的物理性能、可见光-近红外透射光谱透过率、隔热性能进行研究。结果表明,纳米ATO粉体通过偶联剂KH-550改性后,与APU复合制得了分散稳定的纳米复合涂料;ATO/APU复合涂料不仅具有良好的成膜性能,而且在保持可见光透过率83.0%时,红外阻隔率达到70%,隔热后温差能保持在6℃左右,复合涂料具有良好的隔热性能。     

“Effect of nano-ZnO particles on the corrosion behavior of alkyd-based waterborne coatings”

A nano-composite was formed by incorporating nano-ZnO in a specially developed alkyd-based waterborne coating to different loading levels. The nano-ZnO based composite coatings were applied on mild steel substrate by dipping. The coated panels were subjected to various test environments like salt-spray, humidity, UV and mechanical tests like scratch and abrasion. The improvement in electrochemical performance and mechanical properties of the composite coatings were evaluated using various analytical techniques. FTIR technique was used to investigate the interaction between nano-ZnO particles and the polymer functionalities. Differential scanning calorimetry (DSC) was done to study the curing behavior of nano-composite coatings. SEM and AFM were used to investigate dispersion of nano-ZnO particles and the changes in the surface behavior of the coatings before and after exposure to the test environment. The result showed that, with increase in the concentration of nano-ZnO there was an improvement in the corrosion resistance, UV resistance and mechanical properties of the coatings indicating the positive effect of addition of nano-ZnO particles in the coatings.     

Microstructure evolution and mechanical properties of in-situ bimodal TiC-Fe coatings prepared by reactive plasma spraying

An in-situ synthesis phenomenon of bimodal TiC-Fe coatings is discovered in the reactive thermal spraying of Fe-Ti-C composite powders. The Fe-Ti-C composite powders were prepared by a hybrid spray-drying/pyrolysis technology using a mixture of ferrotitanium (TiFe), graphite and sucrose. The microstructure evolution and mechanical properties of the coatings were investigated. The results showed that the TiC-Fe coatings exhibited an apparent bimodal particle size distribution of submicron and nano TiC particles in the α-Fe matrix. The formation of the bimodal distribution structure was revealed as following bi-precipitation mechanism: the first precipitation during the flight process to form submicron TiC particles and the second precipitation in the impact process with rapid cooling to form nano TiC particles. The bimodal TiC-Fe coatings showed high microhardness in various loads due to simultaneous hardening effect from submicron and nano TiC particles. The crack analysis showed that the in-situ bimodal TiC structure hindered the crack initiation and the crack propagation and thus improved the fracture toughness. The bimodal TiC-Fe coatings exhibited high abrasive wear resistance and the wear mechanism transformed from two-body abrasive wear to three-body abrasive wear with the increase of spray distances.     

复合电沉积制备TiO_2/泡沫镍光催化材料及其催化活性

采用复合电沉积方法制备了TiO2/泡沫镍光催化材料,通过扫描电子显微镜（SEM）和能量色散谱（EDS）分别对纳米复合镀层进行了形貌和成分表征,同时研究了在镀液中添加不同表面活性剂对光催化材料镀层的影响。讨论了TiO2/泡沫镍光催化材料对大肠杆菌和小球藻的光催化活性。结果表明：在本实验的电沉积工艺条件下,泡沫镍基底上获得了微粒分布均匀、Ti的质量分数为5.97%的纳米TiO2-Ni复合沉积层。添加了阴离子表面活性剂的光催化材料表面TiO2颗粒具有良好的分散性。TiO2/泡沫镍光催化材料处理含大肠杆菌水样,反应30 min灭活率达到60.1%,反应2 h灭活率达到99.9%;处理水中的小球藻溶液,初始3 h内,小球藻溶液中所含叶绿素a从初始的98.2 mg/m3降至38.2 mg/m3。     

镍基复合镀技术的研究进展及应用

综述了耐磨复合镀层、自润滑复合镀层、耐蚀复合镀层、耐高温复合镀层、特殊功能复合镀层等镍基复合镀层的研究进展和应用概况,总结了目前镍基复合镀技术存在的问题,展望了未来的发展趋势.     

纳米粉体在化学复合镀中的应用

向化学镀液中加入纳米粉体，使纳米粉体与金属共沉积，可得到性能各异的纳米化学复合镀层。对Ni—P基化学复合镀的沉积机理进行了推测。从高硬度耐磨性、自润滑性、抗高温氧化性、耐腐蚀性等方面，介绍了各种纳米化学复合镀层的研究进展。对纳米粉体的分散性问题进行了探讨，并对纳米化学复合镀层的前景提出了展望。     

基于神经网络电沉积Cu-Al2O3纳米复合镀层的研究

在电沉积法制备Cu-Al2O3纳米复合镀层过程中,期望能够得到纳米微粒复合量较高的沉积层,以提高镀层的性能.首先采用正交试验法初选出对影响复合量的工艺参数,如电流密度、添加量、搅拌速度等,然后利用Matlab神经网络工具箱建立BP神经网络模型,对工艺参数进行仿真、预测;优选出最佳参数组合.用扫描电子显微镜(SEM)及其附带的能谱仪(EDS)对复合镀层成分以及组织结构分析.结果表明:在该参数组合条件下,沉积层中微粒分散均匀,纳米Al2O3微粒数分数可达14.43%.     

Study on electrochemical behavior of Nano‐ZnO modified alkyd‐based waterborne coatings

A nano‐composite coating was formed using nano‐ZnO as pigment in different concentrations, to a specially developed alkyd‐based waterborne coating. The nano‐ZnO modified composite coatings were applied on mild steel substrate by dipping. The dispersion of nano‐ZnO particles in coating system was investigated by scanning electron microscopic and atomic force microscopic techniques. The effect of the addition of these nano‐pigments on the electrochemical behavior of the coating was investigated in 3.5% NaCl solution, using electrochemical impedance spectroscopy. Coating modified with higher concentration of nano‐ZnO particles showed comparatively better performance as was evident from the pore resistance (R_po) and coating capacitance (C_c) values after 30 days of exposure. In general, the study showed an improvement in the corrosion resistance of the nano‐particle modified coatings as compared with the neat coating, confirming the positive effect of nano‐particle addition in coatings. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

PP/TiO2纳米复合材料的研制及其抗老化机理分析

制备了聚丙烯(PP)／TiO2纳米复合材料,用氙灯耐气候试验机对该复合材料进行人工加速老化试验。采用紫外一可见光光谱法分析了纳米TiO2等粉体材料的紫外吸收性能;分析了PP／TiO2纳米复合材料的红外光谱并探讨了抗老化机理;对比研究了纯PP和PP／TiO2纳米复合材料老化期间力学性能的变化规律。结果表明,纳米TiO2能赋予PP优异的耐候性能,延长制品的户外使用寿命。