超轻微孔硅酸钙绝热材料的显微结构和工艺控制

超轻硅钙绝热材料的固相含量只占整个体积的５％以下，要使如此之少的固相充满全部体积，并成为具有相当强度的刚性体积的材料必须具有纤维状的显微结构。超轻硅酸钙材料实际上是由硬硅钙石纤维状晶体组成的多孔球状团聚体构成。整个材料的气孔率达９５％以上，气孔半径呈多重分布。球状团聚体越大材料越轻。为获得理想的显微结构，需要设计合理的硬硅钙石合成工艺和压滤成型工艺。合成工艺参数包括原料的配比，水热合成反应的温度、

MICROSTRUCTURE AND PROCESSING OF UL-TRA-LIGHT CALCIUM SILICATE INSULATION MATERIAL

Ultra_light calcium silicate insulation material, which contains only less than 5% of solid phase by volume, must possess fibrous microstructure, so that a right body with certain strength can be formed with so small amount of solid. Ultra_light calcium silicate insulation material is constructed with spherical agglomerates of fibrous xonotlite crystals. The material contains more than 95% of pores. The pore size has multi_mode distribution. The larger agglomerate size is the lower density of the material. It is necessary to optimize the process of synthesis of xonotlite as well as the forming process for obtaining a desired microstructure in the material. The synthesis parameters include the ratio of CaO/SiO 2 in batches, temperature, pressure, timeperiod, stirring type and additives. The forming parameters include fiber content in the forming slurry, surface tension and temperature of the slurry, and the forming pressure.