In this work,bauxite cement and clay were used as raw materials to prepare anorthite insulation refractory by foaming method.On the basis of analyzing the effect of sintering temperature(1 110～1 310℃)on the microstructure and properties of anorthite insulation refractory by XRD,SEM and thermal conductivity meter,the synthesis mechanism of anorthite insulation was studied.The results show that when the sintering temperature is between 1 110℃and 1 160 ℃,anorthite begins to form,but the reactions between raw materials are not complete,the liquid phase content is less and the strength is lower.When the sintering temperature is between 1 210℃and 1 260℃,the liquid phase content increases,the rate of anorthite formation was accelerates,the strength increases,and the samples have a low thermal conductivity.When the sintering temperature is 1 310 ℃,the liquid phase content increases rapidly,the linear shrinkage rate increases rapidly,and the samples have higher strength,but the bulk density increases significantly and the porosity decreases.At 1 260 ℃,the anorthite insulation refractory is prepared,with bulk density of 0.53 g/cm3,porosity of 82.6％,flexural strength of 1.15 MPa,compressive strength of 1.99 MPa,and thermal conductivity of 0.101 W/(m·K)at 800 ℃.
关键词
钙长石/发泡法/烧成温度/隔热/玻璃相/孔径分布
Key words
anorthite/foaming method/sintering temperature/insulation/glass phase/pore size distribution
维普
万方数据