新型多腔孔陶瓷复合保温材料的制备及性能研究

通过原料及配方的创新,以硅酸铝纤维、玻化微珠等为原料制备了一种新型多腔孔陶瓷复合保温材料。研究了材料的导热性能和显微结构。结果表明:材料导热系数低,热面温度200℃时导热系数仅为0.050 W/(m·K),热面温度600℃时导热系数为0.084 W/(m·K);材料内部结构疏松,存在多级配的孔隙结构,孔隙尺寸在微米级以下。利用马弗炉进行保温性能测试,保温材料内表面温度600℃,厚度仅为139mm时,稳态时外表面温度即可低于46℃,散热损失仅为158 W/m~2,远远低于标准规定的最大散热损失266 W/m~2。将材料制成1cm厚度的块材时,材料能产生较大弯曲而不损坏,有利于对电厂高温管道进行包覆。

Preparation and Characterization of a New Composite Multi-porosity Silicate Insulation Material

Through the innovation of raw materials and formula,a new ceramic composite thermal insulation material was prepared with the use of aluminum silicate cotton,glass beads and other nano powders.The heat conduc-tion performance and microstructure were investigated.The results show that the thermal conductivity is very low. The thermal conductivity is only 0.050 W/(m·K)and 0.084 W/(m·K)when hot surface temperature is 200 ℃ and 600 ℃.The internal structure is porous.There are multiple graded pore structure and pore sizes in the micron or less.Muffle furnace was used for basic thermal insultation behaviour experiment.When the insulation material inner/outer surface temperature is 600 ℃/46 ℃,the material thickness is 139 mm and its heat loss is only 1 58 W/m2 which is far below the standards specified maximum heat loss 266 W/m2 .The material has a great bending without damage when the thickness of the material is 1 cm,which is beneficial for pipe coating.