表面活性剂对镁质泡沫料浆及多孔骨料显微结构的影响
Effect of surfactant on microstructure of magnesia foam slurry and porous aggregates
孙格格 1李国华 1矫长发 1田琳1
作者信息
- 1. 辽宁科技大学材料与冶金学院 辽宁鞍山 114051
- 折叠
摘要
以轻烧镁粉为原料、十二烷基苯磺酸钠(SDBS)为表面活性剂,采用直接发泡法制备氧化镁泡沫料浆及镁质多孔骨料.研究表面活性剂SDBS对水系泡沫、氧化镁泡沫料浆、镁质多孔骨料显微结构的影响.结果表明:1)在水系泡沫中,随SDBS加入量增加,水系泡沫液膜增厚,泡沫形状由多边形转变为圆形,泡沫稳定性增加;2)氧化镁泡沫料浆中气泡形状为球形,氧化镁包覆在气泡周围阻碍液膜排液及气体扩散;3)氧化镁泡沫料浆衍生到多孔骨料过程中,骨料气孔数量减少,尺寸增加,形成封闭的圆形气孔,当SDBS加入量超过3％(w)后,气孔形状不完整;4)SDBS加入量为1％～4％(w)时,1 600 ℃下烧结的镁质多孔骨料,平均孔径为40.83～92.90 μm,气孔率为 51.6％～73.9％.
Abstract
Magnesia foam slurry and porous magnesia aggregate were prepared by direct foaming with light-burned magnesia powder as the raw material and sodium dodecyl benzene sulfonate(SDBS)as the surfactant.Effects of surfactant SDBS on the microstructure of aqueous foam,magnesia foam slurry,and porous magnesia aggregate were studied.The results show that:(1)in aqueous foam,with the increase of the SDBS addition,the liquid films of aqueous foam thicken,the shape of foam changes from polygon to circle,and the foam stability increases;(2)the bubbles in the magnesia foam slurry are spherical,and magnesia coats around the bubbles to hinder the liquid film drainage and gas diffusion;(3)from magnesia foam slurry to porous aggregates,the number of aggregate pores decreases and the size increases,form-ing closed circular pores;when the SDBS addition exceeds 3 mass％,the pore shapes are incomplete;(4)the porous magnesia aggregate with the SDBS addition of 1％-4％(by mass)sintered at 1 600 ℃ has an average pore size of 40.83-92.90 μm and a porosity of 51.6％-73.9％.
关键词
镁质多孔骨料/氧化镁料浆/十二烷基苯磺酸钠/显微结构Key words
porous magnesia aggregate/magnesia slurry/sodium dodecyl benzene sulfonate/micro-structure引用本文复制引用
出版年
2024
NETL
NSTL
万方数据