Evolution mechanisms of MgO-Al2O3 in non-oriented silicon steel
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 be...
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Science Press
2015-01-01
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| Series: | 工程科学学报 |
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| Online Access: | http://cje.ustb.edu.cn/article/doi/10.13374/j.issn2095-9389.2015.01.004 |
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| author | SUN Yan-hui ZHAO Yong CAI Kai-ke SUN Sai-yang MA Zhi-fei FANG Zhong-qiang |
| author_facet | SUN Yan-hui ZHAO Yong CAI Kai-ke SUN Sai-yang MA Zhi-fei FANG Zhong-qiang |
| author_sort | SUN Yan-hui |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-75efc0c7b47948cc84217aecde35d2c8 |
| institution | OA Journals |
| issn | 2095-9389 |
| language | zho |
| publishDate | 2015-01-01 |
| publisher | Science Press |
| record_format | Article |
| series | 工程科学学报 |
| spelling | doaj-art-75efc0c7b47948cc84217aecde35d2c82025-08-20T02:17:04ZzhoScience Press工程科学学报2095-93892015-01-01371202910.13374/j.issn2095-9389.2015.01.004Evolution mechanisms of MgO-Al2O3 in non-oriented silicon steelSUN Yan-hui0ZHAO Yong1CAI Kai-ke2SUN Sai-yang3MA Zhi-fei4FANG Zhong-qiang5Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, ChinaCollaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, ChinaCollaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, ChinaCollaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, ChinaCollaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, ChinaCollaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, ChinaThe 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.http://cje.ustb.edu.cn/article/doi/10.13374/j.issn2095-9389.2015.01.004steelmakingsilicon steelinclusionsspinelscalcium treatmentmodification |
| spellingShingle | SUN Yan-hui ZHAO Yong CAI Kai-ke SUN Sai-yang MA Zhi-fei FANG Zhong-qiang Evolution mechanisms of MgO-Al2O3 in non-oriented silicon steel 工程科学学报 steelmaking silicon steel inclusions spinels calcium treatment modification |
| title | Evolution mechanisms of MgO-Al2O3 in non-oriented silicon steel |
| title_full | Evolution mechanisms of MgO-Al2O3 in non-oriented silicon steel |
| title_fullStr | Evolution mechanisms of MgO-Al2O3 in non-oriented silicon steel |
| title_full_unstemmed | Evolution mechanisms of MgO-Al2O3 in non-oriented silicon steel |
| title_short | Evolution mechanisms of MgO-Al2O3 in non-oriented silicon steel |
| title_sort | evolution mechanisms of mgo al2o3 in non oriented silicon steel |
| topic | steelmaking silicon steel inclusions spinels calcium treatment modification |
| url | http://cje.ustb.edu.cn/article/doi/10.13374/j.issn2095-9389.2015.01.004 |
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