摘要
采用高能球磨法制备了碳酸钙(纳米)/二氧化硅(微米)复合粒子。用X射线衍射(XRD)、透射电子显微镜(TEM)、扫描电子显微镜(SEM)、能谱分析仪(EDS)和傅里叶变换红外光谱仪(FT-IR)研究了球磨过程中复合粉体的相组成和微观组织;对碳酸钙/二氧化硅复合粒子的粒径、形态、结构进行了测定与表征。结果表明随着球磨时间的延长,复合粉体在强烈的冲击、挤压作用下逐渐细化和均匀化;球磨240 min可形成结合紧密的碳酸钙/二氧化硅复合粒子,并使之球形化;纳米碳酸钙均匀复合于二氧化硅的表面及其空隙,复合过程中没有产生新物质;强烈的机械力作用,使纳米碳酸钙表面晶体结构发生畸变,颗粒表面无定形化程度增加。
CaCO3 （ nano ）/SiO2 （ micron ） composite particles were prepared directly by high-energy ball milling. SEM, XRD, TEM, EDS, and FT - IR were used to investigate the phase composition and micro organization of composite particles during the milling process. Particle size, morphology, and structure of CaCO3/SiO2 composite particles were characterized and tested. Results showed that composite particles got refined and well-distributed gradually under a strong impact and pressure along with the milling time increased. Tight hall-shaped CaCO3/SiO2 composite particles were formed after milled 240 rain. Nano-sized calcium carbonate particles can be adhered evenly on the surfaces and holes of micron-sized silica particles. During the coating process, there were no new materials formed. Strong mechanical force made the surface crystal structure of nano-sized calcium carbonate distort and the amorphous level of particle surface increase.
出处
《无机盐工业》
CAS
北大核心
2009年第1期32-34,共3页
Inorganic Chemicals Industry
关键词
碳酸钙
二氧化硅
复合粒子
高能球磨
calcium carbonate
silica
composite particle
high - energy ball milling
