负载钛偏高岭土陶瓷粉体制备中晶型转变及其性能研究  

Investigation on the Crystal Transfer and the Performances of Metakaolin-supported Titanium Ceramic Powder in the Preparation Process

作　　者：张旭[1,2] 严云[1,2] 谢斐琳 胡志华[1,2] 刘元正[1,2] 

机构地区：[1]西南科技大学四川省非金属复合与功能材料重点实验室-省部共建国家重点实验室培育基地,绵阳621010 [2]西南科技大学先进建筑材料四川省重点实验室,绵阳621010

出　　处：《武汉理工大学学报》2013年第10期5-10,共6页Journal of Wuhan University of Technology

基　　金：国家高技术研究发展计划("863"计划)(2011AA06A106)

摘　　要：采用溶胶-凝胶法制备钛溶胶,以磁力搅拌的方式负载到高岭土(硫铁矿尾矿)上,采用一步法煅烧将其制备成负载钛偏高岭土陶瓷粉体。研究了不同煅烧制度对该陶瓷粉体的物相晶型转变及其掺入水泥基材料后对其力学性能的影响;研究了该陶瓷粉体及其加入水泥试块后对有机溶剂亚甲基蓝(MB)溶液的催化降解率。结果表明,最佳煅烧制度是750℃保温2h,掺入水泥基材料中具有较高火山灰活性和较好的光催化性能。通过XRD,TG-DSC,FT-IR,TEM,EDS及ABS等测试方法分析可知,此时制备出的陶瓷粉体中负载钛分布均匀,且基体为具有较好活性的偏高岭土,TiO2的晶型为具有较好光催化活性且结晶度较好的锐钛矿型。A new process for preparing metakaolin-supported titania ceramic powders by so-called single calcination method was investigated. The kaolin was mixed with the titania sol by sol-gel method by agitating magnetically firstly, and then calcining the mixture with the optimum calcination regime. The effect of different calcinations regime on the photocatalytic performance and pozzolanic activity of the ceramic powders has been investigated. The difference of crystal transformation between metakaolin-supported titania ceramic powders and the pure titania powder has been investigated. The results show that the optimum calcination regime is 750 ~C for 2 h; the cement base material adding with it has both good pozzolanic activity and photocatalytic performance. Micro-analysis was examined by XRD, TG-DSC, FT-IR, TEM, EDS and ABS. The crystal form of titania supported on the metakaolin ceramic powder was anatase with a good crystallinity and its distribution was uniform. The matrix phase was amorphous metakaolin which has a good pozzolanic activity.

关 键 词：负载钛偏高岭土 制备 晶型转变 火山灰活性 光催化性能 

分 类 号：TQ174.12[化学工程—陶瓷工业]