共查询到20条相似文献,搜索用时 165 毫秒
1.
2.
3.
4.
5.
6.
7.
8.
9.
以聚二硫二丙烷磺酸钠(SPS)、明胶蛋白胨(GP)、氯离子为添加剂采用直流电镀制备了高度(220)择优取向的纳米孪晶铜,并探究了其形核机理。结果表明,加入SPS会使镀层由(111)和(220)取向转变为具有(220)择优取向的纳米孪晶铜,并且SPS浓度会强烈影响镀层的过渡层厚度。SPS和GP在铜表面竞争性吸附,使镀层的内应力比单一添加剂时更高,镀层通过形成(220)择优取向孪晶铜释放内应力。纳米孪晶铜的形核和生长受到电流密度和添加剂的共同影响,在合适的过电位下镀层才能通过形成孪晶来释放应变能。在20 mg/L SPS、4 A/dm2条件下,孪晶结构最完整,过渡层最薄。 相似文献
10.
《硅酸盐通报》2006,25(6):208-208
“高耐蚀耐磨非晶纳米晶复合涂层材料及制备技术”课题开发了高耐蚀耐磨非晶纳米晶复合涂层的制备技术,具有两个重要特点:一是可直接获得非晶纳米晶粉体材料,并在喷涂过程中保证粉体材料结构不发生改变,获取非晶纳米晶复合涂层;二是对非晶粉体材料,通过控制喷涂技术参数,在喷涂过程中改变、调节粉体组织结构,使得形成的喷涂涂层具有非晶纳米晶复合结构。开发了新型熔一喷硬质合金涂层的制备技术与装备,具有涂层结合强度高、组织结构致密均匀、耐腐蚀、耐磨损、耐高温、抗冲击、抗疲劳性好等特点,并可实现功能不同的梯度涂层。在北京顺义建立了热喷涂示范生产线;在哈尔滨电机厂开展了涂层性能的台架试验,对高耐蚀耐磨非晶纳米晶复合涂层在水轮机叶片上的应用开展研究,取得良好效果;在河北省梯级水电站对拟报废旧转轮进行修复,经一个汛期(三个月)的实地使用考察,涂层表现优良,获得电站专家的高度评价。申请发明专利9项。 相似文献
11.
In this paper, coatings adopted SiO2 nanoparticles ranging from 1 wt% to 7 wt% were in situ polymerized with low surface energy polymer, and different surface microstructures were built automatically during painting film. Copper microstructure surface was also achieved by chemical etching method and then was modified by low surface energy resin as contrast. The contact angle and the peel strength between the coating and bio-gooey simulacrum were studied. The results showed that the hydrophobicity of the coating was remarkably affected by the surface microstructure. The coating containing 5 wt% SiO2 nanoparticles was covered with micro- and nano-scale salience and holes, and had the maximum contact angle and the minimum peel strength. Copper slices presented uniform micron and sub-micron structure surface when etching for 15 min and the contact angle reached a maximum of 125° after being modified. 相似文献
12.
Diamond-like carbon (DLC) coating doped with copper has been deposited on silicon substrate by pulsed cathodic arc plasma using a composite cathode made of graphite with inserted copper rods. The surface morphology, microstructure and distribution patterns of elements in the coating and substrate have been studied by atomic force microscopy, scanning electron microcopy, Raman spectroscopy and energy dispersive spectroscopy. The results show that the studied coating is very well-adhered to the silicon substrate, with no microcracks, microvoids, localized delaminations or other defects being observed at the coating/substrate interface. It is also shown that the studied coating has layered microstructure and its surface is very smooth, however containing a few of nano-sized particle-like projections of copper oxide that seems to be a specific feature of all the pulsed methods used for deposition of DLC coatings doped with metals. The distribution patterns of elements in the microstructure of the studied coating are discussed. The relationship between refractive index of the coatings, and the intensity ratio of D and G peaks in the Raman spectrum has been established. 相似文献
13.
14.
《Journal of the European Ceramic Society》2020,40(3):798-810
In this work, a freeze-dried TiO2 nano-sized powder was used as the coating material and single tracks of TiOx coating were cladded on Ti-6Al-4V substrates using a diode laser. The microstructure, chemical composition, and mechanical properties of the coatings were characterized and their relationships were explored. Coatings with structural and compositional gradients formed under a laser energy density (LED) of 20 kJ/m, while coatings with a relatively homogeneous microstructure were obtained using a LED of 30 kJ/m. The microstructure evolution was controlled by the molten pool lifetime and the intensity of convective flow during laser processing. The elastic modulus of the graded coating showed a decreasing trend from the top coating surface to the interface while that of the homogeneous coating remained constant. Our results also demonstrated that the hardness and wear resistance of the oxide coatings were up to four and ten times higher than that of the substrate. 相似文献
15.
采用复合电镀技术制备了A u-S iO2纳米微粒复合镀层,研究了镀液中S iO2纳米粉体的浓度对A u-S iO2纳米微粒复合镀层结构与性能的影响,并用扫描电子显微镜(SEM)及能谱仪(EDX)对复合镀层进行了表面形貌和能谱分析,使用X-射线衍射仪(XRD)测试分析了粉体对金镀层组织结构的影响。结果表明,随着镀液中S iO2浓度的增加,镀层中S iO2含量与镀层硬度随之增加,在镀液中S iO2质量浓度为15 g/L时,两者出现最大值;另外S iO2粉体的加入细化了复合镀层的结晶结构。 相似文献
16.
17.
铝合金是常用的导电类零部件基材,工程上一般采用电镀铜或热喷涂铜技术在铝合金零部件表面制备单质铜涂层提高其导电性,但电镀铜层与基体结合不稳定,热喷涂铜涂层存在粗糙度大、易氧化的问题。以冷喷涂技术为手段在2A12铝合金基体上制备单质铜涂层,采用显微镜、扫描电镜、X-射线衍射、表面粗糙度测量仪、显微硬度计和划痕试验机进行涂层组织与性能研究。结果表明,涂层氧化率较低,粗糙度与电弧喷铜涂层相比明显减小,涂层组织过渡良好,未发现明显的疏松与空洞,结合力高于电弧喷涂涂层,电阻率约小于电弧喷涂。 相似文献
18.
Jiang B Liu W Bai Y Huang Y Liu L Han J 《International journal of molecular sciences》2011,12(8):5422-5427
Preparation of recording coating on inkjet printing (RC-IJP) media was proposed. The microstructure and roughness of RC-IJP was analyzed by scanning electron microscopy (SEM) and atomic force microscope (AFM). The surface infiltration process of RC-IJP was studied by a liquid infiltration instrument. The distribution of C, O and Si composites on recording coating surface is analyzed by energy dispersive spectrum (EDS). The transmission electron microscopy (TEM) analysis showed that the nanoscale silica could be dissolved uniformly in water. Finally, the print color is shown clearly by the preparative recording coating. 相似文献
19.
提出了一种丙烯腈-丁二烯-苯乙烯(ABS)塑料化学镀铜激光无钯活化新工艺。对塑料基体进行预处理,然后放入以硫酸铜与次磷酸钠混合配制的活化液中30min,取出干燥,塑料基体表面形成一层活化层;用激光均匀扫描基体表面,活化层中铜离子在激光作用下被次磷酸根离子还原为具有催化活性的铜微粒。研究了活化液配比和激光参数对活化效果的影响,采用正交试验优化了各项参数,通过扫描电镜观察镀层微观形貌,并对激光活化后的基体进行了能谱分析,采用高低温冲击法检测镀层结合性。结果表明,当硫酸铜与次磷酸钠的浓度分别为10g/L和30g/L、激光光斑直径为2mm、扫描速率为2.2mm/s时,镀层完全覆盖基体,基体活化后表面生成一层均匀的铜微粒,镀层表面微观结构紧凑,结合性较好。 相似文献
20.
Silica nanoparticles surface-capped with diglycidyl ether of bisphenol A were dispersed in a solution of epoxy resin, hardener and acetone. The resultant suspension was then coated onto the surface of duplex stainless steel of type DSS 2205 and cured with temperature, generating a 50 μm thick silica/epoxy coating. Epoxy coating without nanosilica was also prepared as a reference in the same manner. Mechanical properties of these coatings were compared and characterized using the Vickers hardness test. Three-point bending test was performed in combination with acoustic emission to analyze the damage initiation and development in the coating. The effects of incorporating the silica particles on the surface characteristics and the corrosion resistance of the epoxy-coated steel were investigated with contact-angle and surface energy as well as by potentiodynamic polarization and electrochemical impedance spectroscopy in a 3.5 wt.% NaCl solution. Results indicate, that silica particles significantly improved the microstructure of the coating matrix, which was reflected in an increased damage resistance, reduced degree of delamination, increased surface roughness and induced hydrophobicity. The silica/epoxy coating was proven to serve as a successful barrier in a chloride-ion-rich environment with an enhanced anticorrosive performance, which was confirmed by the reduced corrosion rate. 相似文献