Abstract: Xonotlite whisker was synthesized by dynamic hydrothermal method with NaCaHSiO4 as raw material, and the high porosity spherical particles of whisker formed under stirring. The influential factors on the formation of xonotlite whisker and porosity of spherical particles, such as reaction temperature, reaction time and molar ratio of CaO to SiO2 in raw material were studied. The results showed that xonotlite whisker particles with the diameter of about 200 nm and ratio of length to diameter over 20 were prepared at the conditions of molar ratio of CaO to SiO2 0.90~1.15, concentration of Na2O 20 g/L, ratio of liquid to solid 30 mL/g, temperature 220℃, reaction time 7 h, and stirring speed 300 r/min. And the highest porosity of spherical particles formed by winding whiskers was 93%.

Key words: xonotlite, whisker, sodium calcium hydrogen silicate, dynamic hydrothermal method

摘要： 采用动态水热法，以硅酸钠钙为原料合成硬硅钙石晶须，通过搅拌使晶须形成高孔隙率的球形颗粒. 考察了温度、时间和原料CaO/SiO2摩尔比等反应条件对硬硅钙石晶须及其球形颗粒孔隙率的影响. 结果表明，将CaO和SiO2按摩尔比0.90~1.15溶于Na2O浓度为20 g/L的NaOH溶液中，控制液固比为30 mL/g，以300 r/min的转速在220℃下水热反应7 h以上，可制备出直径约200 nm、长径比大于20的硬硅钙石晶须，晶须相互缠绕形成的球形颗粒孔隙率最高可达93%.

关键词: 硬硅钙石, 晶须, 动态水热法, 硅酸钠钙