分散剂
润湿
材料科学
Zeta电位
化学工程
水溶液
氮化硅
色散(光学)
流变学
试剂
硅
复合材料
化学
有机化学
纳米技术
冶金
纳米颗粒
工程类
物理
光学
作者
Hui Liu,Xiaolu Pang,Maotian Xu,Tao Xu
标识
DOI:10.1016/j.msea.2006.12.059
摘要
A poly(acrylic acid) ammonium was used as dispersant for highly concentrated aqueous silicon nitride suspensions. The aim was to increase the stabilization efficiency of the dispersants at normal processing conditions (pH 10–11) through rheological and sediment measurements, and to correlate this to stabilizing mechanisms by means of ζ-potential and X-ray photoelectron energy spectrometer measurements. Rheological properties of suspensions stabilized with poly(acrylic acid) ammonium were optimized by using the wetting reagent PEG400, especially at solids loadings above 50 vol.%. XPS measurements showed 39% of SiO2 existed in Si3N4 particles would contribute to the wetting ability and dispersibility of the powder in aqueous solvent. Zeta-potential and sedimentation character show that the dispersant adsorbed on silicon nitride for efficient stabilization at high solids loadings. Efficient wetting ability was obtained for highly concentrated Si3N4 suspensions of up to 60 vol.% solids loadings with the PEG400 as wetting reagent. Finally the shrinkage and strength of green bodies formed by different solid loading slurry were characterized and the feature of the green bodies was shown out.
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