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采用XRD、SEM和激光粒度仪等手段,观察并研究了不同特性氧化镁在硅钢表面形成硅酸镁底层形貌特点,并结合热力学和差热-失重分析了MgO-SiO2的反应机理。研究结果表明:粒度小,活性值高的特种氧化镁在高温退火过程中与基体表面氧化物生成的硅酸镁底层,界面中硅酸镁底层嵌入基体较多,表面致密,颗粒细小,有利于形成附着性能优良的硅酸镁底层。
The characteristics of magnesium silicate bottom layer formed on the surface of silicon steel were observed and studied by means of XRD, SEM and laser particle size analyzer. The reaction mechanism of MgO-SiO2 was analyzed by thermodynamics and differential thermal-mass loss. The results show that the special magnesia with small particle size and high activity value can be embedded in the bottom layer of magnesium silicate produced by the oxide at the surface of the substrate during high temperature annealing. The interface of the magnesium silicate substrate has many embedded substrates, dense surface and fine particles, Form a good adhesion magnesium silicate bottom layer.