钴掺杂摩尔分数对二氧化钛粉体热致变色变发射率性能的研究  

Thermochromic and variable emissivity properties of Co-doped TiO_2 powders with different mole fraction of Co

作　　者：相杉杉 徐晨 徐国跃[1] 郭腾超[1] 刘初阳 XIANG Shanshan;XU Chen;XU Guoyue;GUO Tengchao;LIU Chuyang(College of Material Science and Technology,Nanjing University of Aeronautics &Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学材料科学与技术学院,江苏南京210016

出　　处：《兵器材料科学与工程》2019年第1期36-40,共5页Ordnance Material Science and Engineering

基　　金：国家自然科学基金青年基金(51802155;51403102);江苏省自然科学基金青年基金(BK20140811);中央高校基本科业务费专项资金资助项目(NS2014058);江苏高校优势学科建设工程资助项目(PAPD)

摘　　要：采用固相合成法制备不同摩尔分数Co的TiO_2粉体,用X射线电子显微镜、扫描电子显微镜、紫外可见吸收光谱、IR-2双波段发射率测量仪对粉末进行结构表征和变色变发射率性能测试。结果表明:掺杂CoO的摩尔分数不超过5%时,Co能完全进入TiO_2晶格,超过5%时会形成第二相CoTiO_3;随掺杂CoO摩尔分数的增加,Co/TiO_2粉末的晶粒尺寸逐渐增加,颜色由宝绿色向鲜绿色转变,从浅绿逐渐变深;在测试温度从25℃逐渐升高到800℃时,粉体都是从绿色变到黄色,降至室温时,又会恢复至原来的绿色;从室温升到800℃时,发射率变化量随掺杂摩尔分数的增加逐渐变大,从0.139增大到0.376。Co-doped TiO2 powders with different mole fraction of Co were successfully prepared through solid-state reaction.The structure,morphologies,thermochromic and variable emissivity properties were characterized and analyzed by X-ray electron microscopy,scanning electron microscopy,UV-visible absorption spectra,IR-2 dual band emissometer.The results show that Co can completely enter TiO2 crystal lattice when the mole fraction of Co doped oxide does not exceed 5%.The second impurity CoTiO3 phase is formed with different doping when the mole fraction of Co is more than 5%.With the increase of the mole fraction of Co oxide,the grain size of Co/TiO2 powders increases gradually.The color of the powders changes from bao green to bright green,from light green to dark green.When the testing temperature gradually increases from 25 ℃ to 800 ℃,all the prepared powders change from green to yellow,which can return back to the original color when cooled to room temperature.Simultaneously,the variation of infrared emissivity of the Co-doped TiO2 powders increases from 0.139 to 0.376 with testing temperature changing from room temperature to 800 ℃.

关 键 词：固相合成法 Co掺杂TiO2 掺杂浓度 热致变色变发射率 

分 类 号：TQ0625.4[化学工程]