粉煤灰和烧成温度对矾土基轻量莫来石材料结构及性能的影响  

Effects of Fly Ash and Firing Temperature on Structure and Properties of Bauxite-Based Lightweight Mullite Materials

作　　者：陈富文 桑绍柏[1,2] 万卓夫 马宇洲 廖宁 CHEN Fuwen;SANG Shaobai;WAN Zhuofu;MA Yuzhou;LIAO Ning(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China;National-Provincal Joint Engineering Research Center of High Temperature Materials and Lining 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 [2]高温材料与炉衬技术国家地方联合工程研究中心,武汉430081

出　　处：《硅酸盐通报》2023年第4期1488-1495,共8页Bulletin of the Chinese Ceramic Society

基　　金：国家重点研发计划(2019YFC1904903)。

摘　　要：耐火材料的轻量化是高温工业节能的重要方向。以三级生矾土和粉煤灰为主要原料,采用原位分解法制备轻量M60莫来石材料,研究在不同烧成温度下粉煤灰对轻量M60莫来石材料结构与性能的影响。结果表明:在1400、1500℃烧成温度下,粉煤灰的引入使材料的体积密度降低,总气孔率增加,耐压强度大幅提升;引入粉煤灰的试样1500℃烧成后导热系数有明显下降。当烧成温度达到1600℃时,粉煤灰的引入使材料的总气孔率减小,体积密度略有增加,导热系数明显增加。此外,粉煤灰的引入会降低材料的荷重软化温度。引入34.0%(质量分数)粉煤灰后,所制备莫来石材料的体积密度降低了8%~13%,总气孔率增加了23%~37%;经1500℃烧成后,材料耐压强度达到(122.6±2.2)MPa,1000℃测试时的导热系数仅为0.616 W/(m·K)。Lightweight of refractories is an important direction for high-temperature industry energy conservation.Lightweight M60 mullite materials were prepared via an in-situ decomposition pore-forming route using tertiary raw bauxite and fly ash as main raw materials.The effect of fly ash on the structure and properties of lightweight M60 mullite materials at different firing temperatures was studied.The results show that at the firing temperature of 1400 and 1500℃,the introduction of fly ash reduces the bulk density of materials,increases the total porosity of materials,and greatly increases the compressive strength of materials.The thermal conductivity of sample sintered at 1500℃decreases obviously.When the firing temperature reaches 1600℃,the total porosity of material decreases,the bulk density increases slightly,and the thermal conductivity increases obviously.The introduction of fly ash also reduces load softening temperature of materials.After the introduction of 34.0%(mass fraction)fly ash,the bulk density of prepared mullite materials decreases by 8%~13%,and the total porosity increases by 23%~37%.After firing at 1500℃,the compressive strength of materials reaches(122.6±2.2)MPa,and the thermal conductivity tested at 1000℃is only 0.616 W/(m·K).

关 键 词：三级生矾土 莫来石 轻量化 粉煤灰 烧成温度 导热系数 强度 

分 类 号：TB383[一般工业技术—材料科学与工程]