铬酐在取向硅钢张力涂层成膜中的作用研究

Effect of chromic anhydride on the formation of tension coating of oriented silicon steel

通过设计试验研究方案,并运用XPS、XRD、TG-DSC及FE-SEM等分析检测技术,对铬酐在取向硅钢张力涂层中的作用机理进行了系统性分析研究。结果表明:向张力涂层配料中添加铬酐,在升温固化初始阶段,可利用铬酐低熔点的特点,有助于形成凝胶状膜类物质;在高温固结阶段,通过铬酐自身发生氧化还原反应生成的三价铬骨架结构,同时由磷酸盐和二氧化硅等小分子成膜物填充其间,可减少涂层微孔结构,增加涂层成膜致密性;张力涂层与硅酸镁底层一起对铁基体施加张应力作用,从而细化磁畴,大幅降低硅钢片铁损。

The effect mechanism of chromic anhydride in tension coating of oriented silicon steel was systematically analyzed and studied through the design of experimental research programs and the use of XPS,XRD,TG-DSC and FE-SEM and other analysis and detection techniques.The results showed that the chromic anhydride adding into ingredients of tension coating can help to form gelatinous membrane materials,by using the low-melting-point characteristic of chromic anhydride in the initial stage of heating and curing.And in the indurating stage,the small molecule film-forming materials of phosphates and silica will fill into the trivalent chromium skeleton structure generated by the REDOX reaction of chromic anhydride itself,which can reduce the coating microporous structure and make the coating film more dense.The tension coating combined with magnesium silicate bottom layer can exert tension stress on iron substrate,which can refine magnetic domains and greatly reduce iron loss of silicon steel.