包覆金红石型TiO_2功能性粉煤灰微珠制备和表征分析

Preparation and characterization analyses on the functionality fly ash cenosphere cladding rutile TiO_2

以硫酸钛为钛源,粉煤灰厚壁空心微珠为基体,采用化学沉积和900-1000 ℃煅烧2h的联合工艺制备了表面镀覆金红石型TiO2 的功能性粉煤灰微珠.借助激光粒度分析仪、X射线衍射仪、场发射扫描电子显微镜、X射线能谱仪等表征技术对包覆前后微珠粒径分布、化学成分、表面形貌和结构进行了对比分析.275W 红外灯对上表面分别涂抹掺原微珠涂料和掺功能性微珠（占涂料质量的20%）涂料的水泥砂浆基板照射2h,后者基板下表面温度比前者约低1.4℃,这是粉煤灰微珠表面金红石型TiO2 热反射效应作用的结果.

The functionality fly ash microsphere plated rutile TiO2 was prepared by means of the union process of chemical sedimentation and burned of 2 h at 900-1 000 ℃ with the matrix of fly ash thick wall microspheres the titanium source of titanium sulfate.The size distribution,chemical composition,surface morphology and struc-ture of un-cladding and cladding microsphere were comparatively analyzed by the characterization techniques of laser particle size analyzer,SEM,XRD,and EDS.The upper surfaces of the cement mortar base plates,which were painted respectively exterior wall coating material adding original microsphere or adding functionality mi-crosphere (20% of coating material mass)coating material,were continuously irradiated for 2 h under a infra-red lamp of 275 kW.The temperature of the bottom side of the latter base plate was lower about 1.4 ℃ than that of the bottom side of the former base plate.This was the consequence of heat reflection effect of rutile TiO2 cladding on the surface of fly ash microsphere.