高硅钢用半有机绝缘涂层的制备及其性能研究

为减少高硅钢铁芯叠片间的涡流损耗,以磷酸二氢铝、苯丙乳液、甘油及水为主要原料,制备出一种适合高硅钢用无铬环保半有机绝缘涂层.利用光电子谱仪、扫描电镜及能谱仪对高硅钢脱碳退火板的氧化薄膜、绝缘涂层的微观结构形貌及部分缺陷进行分析,并研究了该涂层的涂覆量对其附着性、硬度及绝缘性能的影响.研究结果表明:普通无取向硅钢磷酸盐环保半有机绝缘涂层同样适用于高硅钢;绝缘涂层的均匀性取决于高硅钢片表面的平整度、涂辊表面质量以及对涂覆速度的平稳控制;高硅钢的表面粗糙度及氧化膜厚度对绝缘涂层的附着性有着重要影响;本试验制备的半有机涂层每面涂覆量控制在0.8~1.2 g/m2,具有良好的附着性及绝缘性能,层间电阻在5Ω·cm2/片以上.

Preparation and properties of inorganic-organic insulation coating for high silicon steel

To reduce eddy current loss between the core lamination of high silicon steel, a kind of chromium?free environment friendly inorganic?organic insulation coating was prepared by Al(H2PO4)3, St-BA emulsion, glycerol and H2 O. The oxide film of decarburization annealed high silicon sheet, the microstructure and defects of the coating were analyzed by X?ray photoelectron spectroscopy(XPS), scanning electron microscope (SEM) and energy dispersive spectroscopy ( EDS ) . The effects of coating weight on the adhesiveness, hardness and insulating properties were studied. The results show that the phosphate inorganic?organic insulation coating for non?oriented silicon steel can also be suitable for high silicon steel. The uniformity of the insulating coating depends on the surface flatness of high silicon steel, the surface quality of coating roll and the controlling coating speed. The surface roughness and thickness of oxide film of high silicon steel have influences on the adhesiveness of insulating coating. This coating has good adhesion and insulating properties when the coating weight per side is 0.8~1.2 g/m2 , the interlamination resistance reaches above 5Ω·cm2/piece.