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Study On Preparation And Application Of Porous Nano-Array Structure On Metal Surface

Posted on:2019-06-18Degree:MasterType:Thesis
Country:ChinaCandidate:F Y ChengFull Text:PDF
GTID:2371330572954141Subject:Polymer Chemistry and Physics
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In recent years,nanomaterials have been a major discovery in science and have become a research hotspot in many fields.The small size effect,surface effect,the quantum size effect,macroscopic quantum tunneling effect and the dielectric limit are the basic characteristics of nano-particles and nano-solids.There are many special properties for nanomaterials owning to above characteristics.Nano Molding Technology?NMT?has been born in electronics manufacturing recently which is a new technology used for combining polymer materials and metal materials with nanotechnology.It has the advantages of simple technological process,light and thin terminal products,diversified appearance decoration,etc.The strength and stability between metal materials and polymer materials by NMT is closely related to porous nano-array structures on metal surfaces.In this paper,porous nano-array structure on the surface of7000-series aluminum alloy and 304stainless steel were prepared by electrochemical anodization.Stable joint structure was formed between metal materials and PBT as well as Al2O3/TiO2 composites using porous nano-array structures were prepared to improve specific capacity of aluminium electrolytic capacitor.This paper is mainly as follows:Porous nano-array structure on the surface of 7000-series aluminum alloy was prepared by electrochemical anodization.The effect of current density,electrolyte temperature,anodic oxidation time and current loading on size and order of porous nano-array structure was systematically studied as well as porous nano-array structure ranging from 30nm to 130nm was obtained.The nano-array structure was characterized by scanning electron microscopy?SEM?and image-pro plus Image analysis software.The results showed that in a certain range,with the increase of anodic oxidation current density,there will be porous nano-array structure with higher order and larger;with the decrease of electrolyte temperature,there will be porous nano-array structure with higher order and larger;with the increase of duty ratio,there will be porous nano-array structure with higher order and larger;with the decrease of frequency,there will be porous nano-array structure with higher order and larger.It was also found that the strength of joint structure between 7000-series aluminum alloy and PBT resin was up to 1.62X104MPa when the array pore size was between 7090nm.Porous nano-array structure on the surface of 304 stainless steel was prepared by electrochemical anodization.The effect of current density,anodic oxidation time and current loading on size and order of porous nano array structure was systematically studied as well as porous nano array structure ranging from 30nm to 100nm was obtained.The nano-array structure was characterized by scanning electron microscopy?SEM?and image-pro plus Image analysis software.It was found that current loading ways with different duty cycles and frequencies could not produce highly ordered porous nano-array structures.But at a certain degree,with the increase of the anodizing current density,there will be porous nano-array structure with higher order and larger;with the decrease of the electrolyte temperature,there will be porous nano-array structure with higher order and larger.It was also found in the NMT technology that when the pore size is between 6080 nm,the strength of the joint structure between 304 stainless steel and PBT resin was up to 7.2X103MPa.Porous nano-array structure was prepared on the surface of high-purity aluminum foil by electrochemical anodization.Under the condition of 250mA/cm2 anodization current density and 5 min anodization time,porous nano-array structure with size 40nm was obtained.After surface modification,TiO2 with high dielectric constant was filled into porous nano-array structure,thus the electrode material Al2O3/TiO2 composite film was obtained after heat treatment and anodization.The results showed that comparing with the high-purity aluminum foil without porous nano-array structure,the Ti content in the Al2O3/TiO2 composite film was increased by 30 times,and the specific capacity of the aluminum electrolytic capacitor was increased by 44.26%under400V withstand voltage.
Keywords/Search Tags:porous nano-array, electrochemical anodic oxidation, Aluminium electrolytic capacitor, Surface self-assembly method, Al2O3/TiO2 composites
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