摘要
在合适的温度和pH值下,通过硅酸钠在氯化氨溶液中水解,制备球形二氧化硅超细粉·考察了反应温度、pH值、硅酸钠溶液浓度和流量对产物形成时间的影响,确定了制备球形二氧化硅超细粉的pH值为9,反应温度为60℃,硅酸钠溶液浓度为0 6mol·L-1·并在不同温度对球形二氧化硅超细粉的烧结行为进行了研究·结果表明,当温度超过900℃时,超细二氧化硅粉有明显的烧结现象·采用SEM,TEM表征了二氧化硅为球形纳米超细粉·
Ultrafine nodular silica powder was prepared by the controlled hydrolysis of sodium silicate in chlorination ammonia solution at befitting temperature and pH value. The relationships between the time required for powder formation and reacting temperature, pH value, concentration of sodium silicate solution and its flowrate were discussed with some parameters determined for the preparation, i.e., pH value 9, reacting temperature 60℃ and concentration of sodium silicate 0.6mol·L^(-1). In addition, the relevant sintering behavior at different temperatures for SiO_2 was investigated. The results revealed that the ultrafine silica powder been sintered if the temperature is over 900℃. The structure of nodular powder particles was characterized by TEM and SEM, and the results showed that the silica powder is really of nodular nano-meter particles.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2004年第11期1080-1083,共4页
Journal of Northeastern University(Natural Science)
基金
国家高技术研究发展计划项目(2001BA310A09)
关键词
二氧化硅
粉体
烧结
结构
silica
powder
sintering
structure
