摘要
目的研究水热合成水化硅酸钙超细粉体的微观结构，扩充对非结晶态水化硅酸钙的微观结构的认识．方法对用不同硅质原料经水热反应制备的水化硅酸钙粉体，采用XRD、DSc／TG、SEM、TEM等测试手段研究其微观结构．结果经XRD以及DSC／TG分析，粉体的水化产物主要为弱结晶态的CASH（B）以及类似硬硅钙石的C—S—H凝胶等．SEM观察到粉体为粒径20um左右、分布均匀的颗粒．不同硅质原料制得的粉体在TEM电镜下呈现不同的微观形貌：以硅藻土为硅质原料、钙硅摩尔比为1制得的粉体由50nm左右的球状粒子连接成链状；而以石英砂作为硅质原料、／2（Ca）／n（Si）为0．95制得的粉体为针状纤维，直径为10～20nm，交错叠加在一起．结论水化硅酸钙超细粉体呈现纤维絮状且结晶不良，硅质原料中[SiO4]^4-的聚合结构对反应程度以及反应产物的形貌有较大影响．
In order to deepen the knowledge about the poorly crystalized hydrated calcium silicate, hydrated calcium silicate powders were prepared by means of hydrothermal synthesis using different siliceous materials. The microstructures of the powders were characterized and analyzed by means of XRD, DSC/TG, SEM and TEM etc. The results of XRD and DSC/TG show that the main phases of the two powders are mainly poorly crystalized CSH（B） and predecessor of Xonotlite. Observed by SEM the powders are about 20 um and evenly distributied. Because of the differences of the polymeric structure of [SiO4]^4- in the siliceous materials and the pH value of the solution in the reaction, different powders have different shapes. The particles of the powders made by diatomaceous earth as siliceous material（C/S= 1） are about 50nm and pile up loosely. And the particles of the powders made by quartz sand as siliceous material（C/S = 0.95） are mainly fibres with diameter about 10--20 nm and intervein together.
出处
《沈阳建筑大学学报（自然科学版）》
EI
CAS
2008年第5期823-827,836,共6页
Journal of Shenyang Jianzhu University：Natural Science
基金
重庆市建委项目(2007-42)
关键词
水化硅酸钙
超细粉体
微观结构
[SiO4]^4-
聚合结构
hydrated calcium silicate, superfine powder
microstructure
[SiO4]^4- tetrahedran polymeric structure
