通过测量氮化硅粉体在水溶液中的Zeta电位和颗粒大小,研究了不同条件下氮化硅水基悬浮液的电动特性.结果表明:氮化硅粉体的等电点在pH=4.2处,溶液的pH值以及引入的聚电解质均会使氮化硅颗粒表面的荷电状态发生变化,进而导致粉体在水溶液中的分散状况发生改变.在碱性条件下,添加适量的阴离子聚电解质NH4PAA有利于氮化硅水基悬浮液的稳定分散,而过量的NH4PAA会导致颗粒的重新团聚.
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