粉煤灰制品烧结过程中的微观结构变化  

Microstructure Variations of Fly Ash Products in Sintering Process

作　　者：马保国[1] 王耀城[1] 穆松[1] 黄祥[1] 

机构地区：[1]武汉理工大学硅酸盐材料工程教育部重点实验室,武汉430070

出　　处：《材料导报》2009年第8期59-61,67,共4页Materials Reports

基　　金：国家科技支撑计划"新型墙体材料绿色制造工艺技术与装备"课题(2006BAF02A29)

摘　　要：纯粉煤灰颗粒在1000℃时发生熔融,球型颗粒尺寸减小,颗粒间存在较弱的连接;1100℃时球型颗粒消失,试样熔融成一体。高温显微镜图片表明,制品的烧结过程可以分为4个阶段。掺加了50%页岩的粉煤灰试样在1000℃时即生成液相,填充颗粒间的孔隙提高了试样的密实度,增加了试样在高温时的流动性,并可以使莫来石在1100℃时发生热分解。达到烧结温度点后,试样的焙烧温度越高,断面边界处的轮廓越明显。Pure fly ash particles melt at 1000℃, the diameter of the sphere particles decreases and a weak con-nection among particles comes out; at 1100℃, the sphere particles disappear, sample particles melt into a whole piece. Pictures of high temperature microscope show that the sintering process can be divided into four stepps. Fly ash samples added with 50% shale has liquidoid at 1000℃, which fills the pores and small openings between particles, increase the density and fluid ability at higher temperature, and the mullite has a thermal decomposition. After it reaches the samples＇ sintering temperature, the profile of cross section is sharper when the sinter temperature is higher.

关 键 词：粉煤灰 微观结构 高温显微镜 液相 

分 类 号：TU522.1[建筑科学—建筑技术科学]