摘 要： 研究了柠檬酸、 聚乙烯醇、 聚丙烯酸钠和六偏磷酸钠等对 Al2O3 粉体表面电性能以及浆体分散稳定性的影响。结果表明，加入适 量的六偏磷酸钠和聚丙烯酸钠可有效地提高浆体的分散稳定性。浆体 中加入柠檬酸和聚丙烯酸钠后，氧化铝表面因特征吸附阴离子而使表 面电位变负，等电点降低；而聚乙烯醇的加入，由于高分子链向体相中 伸展，使剪切面向外移动更大的距离，从而使 Zeta 电位降低，并使等 电点发生微小偏移。
关键词:氧化铝；悬浮稳定性；分散
Abstract：The effects of citric acid, polyvinyl alcohol(PVA), sodium hexametaphosphate and sodium polyacrylat(PAAS) on the dispersion stability and powder surface potential of super-fine alumina particles slurry were investigated . It was found that the addition of appropriate amount of sodium hexametaphosphate, or PAAS could improve the dispersion stability of alumina particles slurry effectively. When citric acid and PAAS were added in the alumina particles slurry, the surface potential of alumina becomes lower due to the adsorption anions on alumina, while the isoelectric point (IEP) decreased. When PVA was added, however , the Zeta potential decreased and the IEP shifted a little because the macromolecule chains stretched to the body phase and drived the shear surface to larger distance.
Keywords：alumina; dispersion stability; dispersion
