COMPOSITION AND MICROSTRUCTURE OF MgAl2O4–W COMPOSITE OBTAINED BY ALUMINOTHERMIC REACTION UNDER COKE PROTECTION
MgAl2O4–W composite was synthesized by aluminothermic reducing method using Al, WO3, MgO and corundum as raw materials under coke protection. The effects of temperature, content of corundum on the synthesis of MgAl2O4–W composite and lattice parameter of spinel has been discussed. The differential s...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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University of Chemistry and Technology, Prague
2011-12-01
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| Series: | Ceramics-Silikáty |
| Subjects: | |
| Online Access: | http://www.ceramics-silikaty.cz/2011/pdf/2011_04_384.pdf |
| _version_ | 1811269931495325696 |
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| author | Han Bingqiang Ao Jinqing Ke Changming Li Nan |
| author_facet | Han Bingqiang Ao Jinqing Ke Changming Li Nan |
| author_sort | Han Bingqiang |
| collection | DOAJ |
| description | MgAl2O4–W composite was synthesized by aluminothermic reducing method using Al, WO3, MgO and corundum as raw materials under coke protection. The effects of temperature, content of corundum on the synthesis of MgAl2O4–W composite and lattice parameter of spinel has been discussed. The differential scanning calorimetry (DSC) and thermogravimetric (TG) analysis indicated that spinel began to form at 1058.2°C without corundum and shifted to 1120.7°C with 0.8 mol of corundum. The XRD analysis confirmed that spinel and tungsten are the main phases under coke protection. Alumina rich spinel with a high solubility of alumina was easily formed because of the high exothermic heats. The solubility limit of Al2O3 in spinel is reached when corundum content is 2.1 mol. Furthermore, the calculated lattice parameter of spinel increases with the increment of added corundum content and rising of temperature. Microstructural observation indicates that cubic tungsten located at grain boundaries of well crystallized spinel. Residual WO3 has needle like morphology. |
| first_indexed | 2024-04-12T21:51:57Z |
| format | Article |
| id | doaj.art-64d86404e87749b7a3c94e6a2078f40e |
| institution | Directory Open Access Journal |
| issn | 0862-5468 1804-5847 |
| language | English |
| last_indexed | 2024-04-12T21:51:57Z |
| publishDate | 2011-12-01 |
| publisher | University of Chemistry and Technology, Prague |
| record_format | Article |
| series | Ceramics-Silikáty |
| spelling | doaj.art-64d86404e87749b7a3c94e6a2078f40e2022-12-22T03:15:28ZengUniversity of Chemistry and Technology, PragueCeramics-Silikáty0862-54681804-58472011-12-01554384389COMPOSITION AND MICROSTRUCTURE OF MgAl2O4–W COMPOSITE OBTAINED BY ALUMINOTHERMIC REACTION UNDER COKE PROTECTIONHan BingqiangAo JinqingKe ChangmingLi NanMgAl2O4–W composite was synthesized by aluminothermic reducing method using Al, WO3, MgO and corundum as raw materials under coke protection. The effects of temperature, content of corundum on the synthesis of MgAl2O4–W composite and lattice parameter of spinel has been discussed. The differential scanning calorimetry (DSC) and thermogravimetric (TG) analysis indicated that spinel began to form at 1058.2°C without corundum and shifted to 1120.7°C with 0.8 mol of corundum. The XRD analysis confirmed that spinel and tungsten are the main phases under coke protection. Alumina rich spinel with a high solubility of alumina was easily formed because of the high exothermic heats. The solubility limit of Al2O3 in spinel is reached when corundum content is 2.1 mol. Furthermore, the calculated lattice parameter of spinel increases with the increment of added corundum content and rising of temperature. Microstructural observation indicates that cubic tungsten located at grain boundaries of well crystallized spinel. Residual WO3 has needle like morphology.http://www.ceramics-silikaty.cz/2011/pdf/2011_04_384.pdfSpinelCompositeSolid solutionDefects |
| spellingShingle | Han Bingqiang Ao Jinqing Ke Changming Li Nan COMPOSITION AND MICROSTRUCTURE OF MgAl2O4–W COMPOSITE OBTAINED BY ALUMINOTHERMIC REACTION UNDER COKE PROTECTION Ceramics-Silikáty Spinel Composite Solid solution Defects |
| title | COMPOSITION AND MICROSTRUCTURE OF MgAl2O4–W COMPOSITE OBTAINED BY ALUMINOTHERMIC REACTION UNDER COKE PROTECTION |
| title_full | COMPOSITION AND MICROSTRUCTURE OF MgAl2O4–W COMPOSITE OBTAINED BY ALUMINOTHERMIC REACTION UNDER COKE PROTECTION |
| title_fullStr | COMPOSITION AND MICROSTRUCTURE OF MgAl2O4–W COMPOSITE OBTAINED BY ALUMINOTHERMIC REACTION UNDER COKE PROTECTION |
| title_full_unstemmed | COMPOSITION AND MICROSTRUCTURE OF MgAl2O4–W COMPOSITE OBTAINED BY ALUMINOTHERMIC REACTION UNDER COKE PROTECTION |
| title_short | COMPOSITION AND MICROSTRUCTURE OF MgAl2O4–W COMPOSITE OBTAINED BY ALUMINOTHERMIC REACTION UNDER COKE PROTECTION |
| title_sort | composition and microstructure of mgal2o4 w composite obtained by aluminothermic reaction under coke protection |
| topic | Spinel Composite Solid solution Defects |
| url | http://www.ceramics-silikaty.cz/2011/pdf/2011_04_384.pdf |
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