陶瓷相结合粉煤灰漂珠轻质隔热材料的制备及性能研究  

Preparation and Properties of Lightweight Insulation Materials of Ceramic Phase Bonded Fly Ash Cenosphere

作　　者：董博 闵昌胜 陈博[1] 邓承继[1] 谢哲 杨千秋 丁军[1] 祝洪喜[1] 杨昕雨 余超[1] DONG Bo;MIN Changsheng;CHEN Bo;DENG Chengji;XIE Zhe;YANG Qianqiu;DING Jun;ZHU Hongxi;YANG Xinyu;YU Chao(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,武汉430081

出　　处：《硅酸盐通报》2022年第9期3315-3323,共9页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金联合基金(U20A20239);大学生创新创业基金(21ZA010)。

摘　　要：以钾长石和粉煤灰漂珠为主要原料,矾土为调质剂,在空气气氛下经900~1150℃保温1 h制备得到轻质隔热材料,并研究了烧成温度与矾土含量对轻质隔热材料服役性能的影响规律及作用机理。结果表明,通过提升烧成温度或增加矾土含量,能够有效优化轻质隔热材料的常温物理性能。当烧成温度为1100℃、调质剂矾土质量分数为20%时,试样具有最佳物理性能,其体积密度约为(0.97±0.01)g·cm^(-3),真气孔率约为(63.7±0.5)%,常温耐压强度达到(9.42±0.21)MPa,同时其300℃和600℃下的高温热导率分别约为0.147 W/(m·K)和0.229 W/(m·K),与一般轻质隔热材料相比同样具有优异服役性能,且制备成本较低。Potassium feldspar and fly ash cenosphere(FAC)were used as raw materials,and bauxite was used as a texturizer for the preparation of lightweight insulation materials at 900~1150℃for 1 h in the air atmosphere.The influence law and action mechanism of sintering temperature and bauxite content on the service performance of lightweight insulation materials were studied.The results show that the cold physical properties of lightweight insulation materials are effectively optimized by the increase of sintering temperature or bauxite content.The sample containing 20%(mass fraction)bauxite has the best physical properties after sintering at 1100℃.The bulk density,true porosity,and cold crush strength of sample are(0.97±0.01)g·cm^(-3),(63.7±0.5)%,and(9.42±0.21)MPa,respectively.Besides,the sample has good thermal insulation performance with thermal conductivity of 0.147 W/(m·K)at 300℃and thermal conductivity of 0.229 W/(m·K)at 600℃.Compared with general lightweight insulation materials,the porous potassium feldspar-FAC lightweight insulation material has excellent service performance and lower preparation cost.

关 键 词：钾长石 粉煤灰漂珠 轻质隔热材料 物理性能 高温热导率 孔径分布 

分 类 号：TQ175.7[化学工程—硅酸盐工业]