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無取向硅鋼中鎂鋁尖晶石的變性機理

Evolution mechanisms of MgO-Al2O3 in non-oriented silicon steel

  • 摘要: 對無取向硅鋼鈣處理過程中鎂鋁尖晶石夾雜的變性機理進行了研究,重點考察了鈣處理前期和中期MgO-Al2O3的變性過程.鈣處理前,鋼中除了發現單純的MgO-Al2O3外,還發現少量被AlN包裹的MgO-Al2O3.鈣處理1.5 min后,在MgO-Al2O3表面有中間產物CaS或CaO形成;鈣處理4.5 min后,生成由內到外依次為MgO-Al2O3、CaO-MgO-Al2O3和CaOAl2O3的夾雜物;鈣處理10 min后,未反應的MgO-Al2O3消失,CaO-MgO-Al2O3和CaO-Al2O3的成分趨于均勻.通過熱力學計算得到了Al2O3/MgO-Al2O3/MgO和MgO-Al2O3/xCaO·yAl2O3的穩定相圖,發現在含鋁越高的鋼中,鎂鋁尖晶石變性越困難.結合夾雜物的掃描電鏡觀察、能譜分析和面掃描圖分析結果,提出了夾雜物的變性路徑:MgO或Al2O3→MgO-Al2O3→CaO-MgO-Al2O3→CaO-Al2O3;在產物的中間層CaO-MgO-Al2O3中,Al2O3含量除了一般情況下的逐漸降低外,偶爾還存在突然升高的情況.

     

    Abstract: The evolution mechanisms of MgO-Al2O3 in the process of calcium treatment in non-oriented silicon steel were studied by laboratory experiments, with focus on the evolution process in the early and middle of calcium treatment. A small amount of MgO-Al2O3 surrounded by AlN was occasionally detected besides many pure spinels before calcium treatment. CaS or CaO formed as a tran-sient inclusion in the MgO-Al2O3 surface 1.5 min after calcium treatment. The composition from the inner part to outer part of inclu-sions was MgO-Al2O3, CaO-MgO-Al2O3 and CaO-Al2O3 in order 4.5 min after calcium treatment. 10 min after calcium treatment, unreacted MgO-Al2O3 spinels disappeared, and simultaneously CaO-MgO-Al2O3 and CaO-Al2O3 inclusions became homogeneous in composition. The phase stability diagrams of Al2O3/MgO-Al2O3/MgO and MgO-Al2O3/xCaO·yAl2O3 were calculated using thermo-dynamic data. The result showed that it was difficult to modify MgO-Al2O3 spinels with very high aluminum content. In combination with the scanning electron microscopy images, energy-dispersive spectra and element mappings of typical inclusions, the evolution route of an inclusion was described as MgO or Al2O3→MgO-Al2O3→CaO-MgO-Al2O3→CaO-Al2O3, and the alumina content occa-sionally showed a sudden increase besides a common decrease in the middle part of the product.

     

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