泡沫粉煤灰保温砖的制备与性能研究  

Preparation and Properties of Foamed Fly Ash Insulating Brick

作　　者：曾小军[1] 刘维良[1] 李阳城[1] 冯翀龙[1] 

机构地区：[1]景德镇陶瓷学院,江西景德镇333001

出　　处：《中国陶瓷工业》2013年第4期11-14,共4页China Ceramic Industry

摘　　要：以粉煤灰为主要原料,以石灰石为发泡剂制备了泡沫粉煤灰保温砖。研究了粉煤灰的用量、石灰石的用量、烧成温度、保温时间对泡沫粉煤灰保温砖的密度、气孔率、导热系数和抗压强度的影响;采用扫描电镜、电子万能试验机和快速热导仪等手段对样品性能进行了表征。实验结果表明,当粉煤灰用量50wt%,石灰石用量15wt%,烧成温度1050℃,保温时间90min时,制备的泡沫粉煤灰保温砖密度为0.55g/cm3,气孔率为58.8%,导热系数为0.13W/m·k,平均抗压强度为4.0MPa;本方法工艺简单,成本低,环保。泡沫粉煤灰保温砖气孔的形成机理是一种气相、液相和固相之间动态平衡的结果。Foamed fly ash insulating bricks were fabricated with fly ash as main raw material, and limestone as a foaming agent. The effects of fly ash content, limestone content, firing temperature and holding time on density, porosity, thermal conductivity and compressive strength of foamed fly ash insulating bricks were investigated. The foamed fly ash insulating bricks were fully characterized by means of scanning electron microscopy （SEM）, electronic tensile testing machine, and fast heat conductivity meter. The results indicated that the as-fabricated foamed fly ash insulating bricks were O.55g/cm3 in density, 58.8% in porosity, O.13W/m ＂k in thermal conductivity and 4.0MPa in average compressive strength when the fly ash content was 50wt%, the limestone content was 15wt%, the sintering temperature was 1050℃ and the holding time was 90 min. The method is simple, low cost and friendly to environment. The pore-forming mechanism of foamed fly ash insulating bricks was a result of dynamical equilibrium between gas phase, liquid phase and solid phase.

关 键 词：粉煤灰 泡沫保温砖 发泡剂 

分 类 号：X773[环境科学与工程—环境工程]