介质阻挡放电等离子体辅助球磨对纳米TiO2粉体的表面改性  

Surface Modification of Nano TiO2 Powders by Dielectric Barrier Discharge Plasma Assisted Ball Milling

作　　者：魏钰坤 廖海峰 颜海涛 吴小乐[3] 戴乐阳[1,2] WEI Yukun;LIAO Haifeng;YAN Haitao;WU Xiaole;DAI Leyang(Fujian Provincial Key Laboratory of Naval Architecture and Ocean Engineering,School of Marine Engineering,Jimei University,Xiamen 361021,China;Fujian Shipping Research Institute of Jimei University,Xiamen 361021,China;Jiujiang Military Representative Office of the General Armament Department,Jiujiang 332000,China)

机构地区：[1]集美大学轮机工程学院,福建省船舶与海洋工程重点实验室,厦门361021 [2]集美大学福建航运研究院,厦门361021 [3]中国人民解放军陆军驻九江地区军事代表室,九江332000

出　　处：《材料导报》2020年第14期14039-14044,共6页Materials Reports

基　　金：国家自然科学基金(51779103);福建省科技计划项目(2018H0026);福建省自然科学基金项目(2019J01708);集美大学福建航运研究院开放课题基金。

摘　　要：为了改善纳米TiO2粉体在润滑油中的分散稳定性,分别以硬脂酸、油酸、季铵盐+月桂酸钠作为表面修饰剂,通过介质阻挡放电等离子体辅助球磨11 h后制备了表面改性的纳米TiO2粉体。采用SEM、FT-IR、XPS、XRD、TG-DSC、亲油化度等对样品进行分析。结果表明:经球磨制备的TiO2粉体粒径在50~200 nm之间,相比原始颗粒晶粒尺寸减小了12%~68%,晶格畸变显著增加;修饰剂中的亲油基团-CH2和-CH3原位修饰在TiO2表面,有机物中的羧酸根和TiO2表面的羟基发生化学反应形成了稳定的共价化学键,使纳米TiO2粉体的亲油化度值明显提高,极大改善了纳米TiO2在润滑油中的分散稳定性。在等离子体辅助球磨过程中,等离子体的快速加热效应是促进TiO2粉体细化、提高粉体活性并影响其表面改性的主要原因之一。In order to improve the dispersive stability of nano TiO2 powders in lubricating oil,several surface modifiers,such as stearic acid,oleic acid,quaternary ammonium salt/sodium laurate and so on,have been selected to prepare surface modified nano TiO2 powders by dielectric barrier discharge plasma assisted ball milling for 11 h.These prepared samples were analyzed by SEM,FT-IR,XPS,XRD,TG-DSC and lipophilic degree.The results show that the particle size of TiO2 powder prepared by ball milling is between 50—200 nm.The crystallite size decreases by 12%—68%and the lattice distortion increases significantly.The nano TiO2 powders are in situ modified by lipophilic groups-CH2 and-CH3 in the modifier on the surface.The lipophilicity of modified nano TiO2 powders has been improved dramatically because of stable covalent chemical bonds formed by the chemical reaction between carboxylic acids in organic compounds and hydroxyl groups on the surface of TiO2,which results in the improvement of dispersion stability of nano TiO2 in lubricating oil.In the ball milling assisted by high-energy plasma,the rapid heating effect of plasma is one of the main reasons for promotion of the TiO2 powder refinement,improvement of the powder activity and effect of the surface modification.

关 键 词：纳米TIO2 等离子体辅助球磨 表面改性 加热效应 表面活性 

分 类 号：TB383[一般工业技术—材料科学与工程]