摘要：为提高水基液体磁性磨具的稳定性, 选定六偏磷酸钠 (SHMP) 与聚丙烯酸 (PAA) 作为复合分散剂, 纳米二氧化硅为辅剂, 对悬浮液中固相颗粒表面进行改性, 并研究其影响稳定性机理;对单个固相粒子进行微观分析, 表征其物理特性, 同时以沉降率和零磁场黏度为指标研究改性后的水基液体磁性磨具的稳定性。结果表明:六偏磷酸钠、PAA与纳米二氧化硅最佳的配方比例大致为0.19∶0.40∶0.41, 稳定性最好。

关键词：液体磁性磨具；稳定性；复合分散剂

Abstract：In order to improve the stability of water-based fluid magnetic abrasives, sodium hexametaphosphate (SHMP) and PAA were selected as complex dispersants, nano-Si O₂ was used as a adjuvant. The surface of solid phase particles in suspension was modified and the mechanism of its stability was studied. The single solid particles were analyzed to characterize its physical properties on a micro level, and the stability of the modified water-based fluid magnetic abrasives was studied with sedimentation rate and zero magnetic field viscosity as an index.The results show that the optimum formula ratio of sodium hexametaphosphate, PAA and nano-Si O₂ is 0.19:0.40:0.41, and its stability is the best.

Keywords：fluid magnetic abrasives；stability；compound dispersant