纳米技术在涂料中的应用

概述了纳米材料的物理特性,纳米TiO2在涂料中的作用机理及其在涂料中的应用,介绍了纳米涂料在国内外的发展现状以及纳米技术在涂料中的应用前景。     

纳米紫外屏蔽透明涂料

本文对纳米ZnO和SiO2 在紫外屏蔽涂料中的应用进行了综述。阐述了有关纳米材料在紫外屏蔽涂料中应用的一些初步研究结果。通过对涂料的紫外屏蔽率测定 ,发现纳米ZnO和SiO2能够明显提高涂料的抗紫外老化性 ,并制备了具有紫外屏蔽作用的纳米透明涂料     

无机纳米抗紫外涂料的研究进展

无机纳米涂料因其良好的抗腐蚀、抗擦伤和紫外线屏蔽性,已成为抗紫外涂料研究的热点,其中纳米TiO2、ZnO因良好的紫外吸收能力、稳定的化学性质和无毒副作用等特点,而被广泛地研究和应用。着重对纳米TiO2、ZnO等无机抗紫外涂料的研究进展、作用机理、制备方法进行了综述,并对其应用前景进行了展望。     

等离子喷涂 ZrO2基纳米涂层研究进展

ZrO2基纳米涂层具有低的气孔率、高的硬度和结合强度值,具有较低的热导率和较好的抗热冲击能力,且工艺成本低于电子束物理气相沉积,具有良好的应用前景;综述了近年来国内外纳米 ZrO2基陶瓷涂层的制备工艺方法,主要包括纳米粉体等离子喷涂工艺、液相等离子喷涂工艺以及等离子喷涂－物理气相沉积工艺等,综述了涂层稳定掺杂剂研究现状以及涂层后处理工艺等研究进展,对研究和应用前景进行了展望。     

等离子喷涂液相溶胶制备纳米ZrO2涂层的结构

采用等离子喷涂液相溶胶制备了氧化锆纳米结构涂层。用X射线衍射仪、扫描电镜观察了溶胶干燥粉末和涂层的物相组成及显微结构。结果表明,溶胶自然干燥后为非晶态,通过加热可以得到晶体结构,等离子喷涂形成的涂层为单斜相与立方相的混合晶体结构。涂层由致密的熔化较好的颗粒和微裂纹组成。该方法能够得到晶粒很细的纳米结构涂层。     

A study on the N-, S- and Cl-modified nano-TiO2 coatings for corrosion protection of stainless steel

Nano-titania coatings doped with anions of nitrogen, sulfur and chlorine have been supplied on the surface of 316L stainless steel by a sol-gel process and dip-coating technique. The measurements of XRD, SEM, ATR-IR, Raman and XPS were carried out to characterize the chemical composition and structure for the prepared samples. The corrosion performances of the coating in 0.5 M NaCl were evaluated by electrochemical impedance spectroscopy (EIS) and polarization measurements. According to the measurements of EIS and electrochemical polarization, the N-modified TiO₂ nano-coatings show a highest corrosion resistance among the prepared coatings. It is revealed, from the SEM, XRD and Raman characterizations, that the surface of N-modified TiO₂ nano-coatings are more compact and uniform, relatively well-crystallized and able to act as an optimal barrier layer to metallic substrates. The XPS analysis confirms the presence of low concentration of N element in two forms, atomic β-N (interstitial state) and chemisorbed γ-N₂ on the surface of TiO₂ nano-coatings. It is suggested that the addition of nitrogen is beneficial to improve the compact structure and enhance the hydrophobic property.