氧化锆掺杂铝硅复合气凝胶耐热性能研究  

Heat resistance of zirconia doped Al-Si composite aerogel

作　　者：朱伟卓 吴幼青[1] 吴诗勇[1] 韩宇晴 ZHU Weizhuo;WU Youqing;WU Shiyong;HAN Yuqing(East China University of Science and Technology, Shanghai 200030,China)

机构地区：[1]华东理工大学资源与环境工程学院,上海200030

出　　处：《功能材料》2022年第7期7102-7108,共7页Journal of Functional Materials

摘　　要：采用正丁醇锆作为锆源,通过溶胶凝胶法以及超临界乙醇干燥制备氧化锆气凝胶,并使用仲丁醇铝以及二甲基二乙氧基硅烷对其掺杂制备Zr-Al以及Zr-Si复合气凝胶,利用FESEM、XRD、FT-IR以及比表面积和孔结构分析仪对气凝胶形貌、尺寸和结构进行表征。结果表明复合铝后的气凝胶密度从0.393 g/cm^(3)降低到0.147 g/cm^(3),复合硅后的气凝胶比表面积从178 m^(2)/g上升到394 m^(2)/g,耐温性能也显著提高,FESEM照片显示,热处理后Al与Si掺杂的气凝胶形貌变化较小,Zr-Si复合气凝胶在900℃热处理4h之后比表面积仍为168 m^(2)/g,并没有出现ZrO_(2)的相变。氧化锆气凝胶掺杂铝及硅元素之后,有效抑制氧化锆的相变从而提高其耐温性能。Zirconia aerogels were prepared by sol-gel method and supercritical ethanol drying using zirconium butoxide as zirconium source,and Zr-Al and Zr-Si composite aerogels were prepared by doping aluminum sec-butanol and dimethyldiethoxysilane.FESEM,XRD,FT-IR,specific surface area and pore structure analyzer were used to characterize the morphology,size and structure of the aerogels.The results showed that the density of aerogel decreased from 0.393 g/cm^(3) to 0.147 g/cm^(3),the specific surface area of aerogel increased from 178 m^(2)/g to 394 m^(2)/g,and the temperature resistance also improved significantly.FESEM photos showed that the morphology of aerogel doped with Al and Si changed little after heat treatment.After heat treatment at 900C for 4h,the specific surface area of Zr-Si composite aerogel was still 168 m^(2)/g,and there was no phase transition of ZrO_(2).After doping aluminum and silicon elements,zirconia aerogel can effectively inhibit the phase transformation of zirconia and improve its temperature resistance.

关 键 词：锆气凝胶 掺杂改性 耐温性能 溶胶-凝胶法 超临界干燥 

分 类 号：TB333[一般工业技术—材料科学与工程]