改性SiC料浆悬浮稳定性研究

STUDY OF THE STABILITY OF COATED SiC SUSPENSION

选取丁二酸、乙二醇、对氨基苯磺酸和聚乙二醇(PEG400)四种具有不同分子结构的有机物作为改性剂对SiC微粉进行表面包覆改性,研究了分子结构对料浆悬浮稳定性的影响及不同改性粉体在水中的分散机制。实验表明:丁二酸、乙二醇、对氨基苯磺酸改性的SiC微粉主要是静电稳定,其中对氨基苯磺酸改性粉体的Zeta电位绝对值最高,料浆的悬浮稳定性较前二者好;PEG400改性粉体主要是空间位阻稳定,但其悬浮稳定性最好。

In this paper SiC powders were coated by four modifying agents such as succinic acid, ethylene glycol, sulfanilic acid and PEG400, which had different structures. The impacts of the structures of modifying agents on the stability of SiC suspension and the stability mechanisms of coated SiC suspension were studied. The results showed that the stability mechanisms of the SiC powders coated by succinic acid, ethylene glycol and sulfanilic acid were static electricity stabilization and the Zeta potential of the powders coated by sulfanilic acid was the highest and its suspension stability was better than the others. The stability mechanism of the SiC powders coated by PEG400 was space distance stabilization, and its suspension stability was the best.