Preparation of SiC/Al2O3 composite materials from coal fly ash
By using coal fly ash as a raw material and graphite as a reducer in the protective atmosphere of argon,SiC/Al2O3 composite materials were synthesized by carbothermal reduction.The reaction process of reduction of the coal fly ash was studied,and its influencing factors were investigated.The composi...
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| Format: | Article |
| Language: | zho |
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Science Press
2016-06-01
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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.issn2095-9389.2016.06.013 |
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| author | LI Zi-yong WU Chun-han YU Qing-chun ZHOU Yue-zhen LI Wei YANG Bin |
| author_facet | LI Zi-yong WU Chun-han YU Qing-chun ZHOU Yue-zhen LI Wei YANG Bin |
| author_sort | LI Zi-yong |
| collection | DOAJ |
| description | By using coal fly ash as a raw material and graphite as a reducer in the protective atmosphere of argon,SiC/Al2O3 composite materials were synthesized by carbothermal reduction.The reaction process of reduction of the coal fly ash was studied,and its influencing factors were investigated.The composition of products obtained at different temperatures was analyzed by X-ray diffraction,and the microstructure was observed by scanning electron microscopy and energy dispersive spectroscopy.The results show that the phases of quartz and mullite in the coal fly ash are almost completely reactive at 1673 and 1773 K,respectively.With increasing temperature,the contents of SiC and Al2O3 increase,and the suitable temperature condition is 1773 to 1873 K.The extension of holding time is good for the formation of SiC and Al2O3,and the appropriate holding time is 3 to 4 h.Increasing the carbon content has positive effect on the formation of SiC and Al2O3,and the optimum molar ratio of C/Si is 4 to 5.In the prepared SiC/Al2O3 composite materials,SiC is homogeneously dispersed in the products,and its granularity is less than 20 μm. |
| format | Article |
| id | doaj-art-1faff4ebbab74647ad277def303da830 |
| institution | OA Journals |
| issn | 2095-9389 |
| language | zho |
| publishDate | 2016-06-01 |
| publisher | Science Press |
| record_format | Article |
| series | 工程科学学报 |
| spelling | doaj-art-1faff4ebbab74647ad277def303da8302025-08-20T01:47:51ZzhoScience Press工程科学学报2095-93892016-06-0138683484010.13374/j.issn2095-9389.2016.06.013Preparation of SiC/Al2O3 composite materials from coal fly ashLI Zi-yongWU Chun-hanYU Qing-chunZHOU Yue-zhenLI WeiYANG BinBy using coal fly ash as a raw material and graphite as a reducer in the protective atmosphere of argon,SiC/Al2O3 composite materials were synthesized by carbothermal reduction.The reaction process of reduction of the coal fly ash was studied,and its influencing factors were investigated.The composition of products obtained at different temperatures was analyzed by X-ray diffraction,and the microstructure was observed by scanning electron microscopy and energy dispersive spectroscopy.The results show that the phases of quartz and mullite in the coal fly ash are almost completely reactive at 1673 and 1773 K,respectively.With increasing temperature,the contents of SiC and Al2O3 increase,and the suitable temperature condition is 1773 to 1873 K.The extension of holding time is good for the formation of SiC and Al2O3,and the appropriate holding time is 3 to 4 h.Increasing the carbon content has positive effect on the formation of SiC and Al2O3,and the optimum molar ratio of C/Si is 4 to 5.In the prepared SiC/Al2O3 composite materials,SiC is homogeneously dispersed in the products,and its granularity is less than 20 μm.http://cje.ustb.edu.cn/article/doi/10.13374/j.issn2095-9389.2016.06.013coal fly ashcarbothermal reductionsilicon carbidealuminacomposite materials |
| spellingShingle | LI Zi-yong WU Chun-han YU Qing-chun ZHOU Yue-zhen LI Wei YANG Bin Preparation of SiC/Al2O3 composite materials from coal fly ash 工程科学学报 coal fly ash carbothermal reduction silicon carbide alumina composite materials |
| title | Preparation of SiC/Al2O3 composite materials from coal fly ash |
| title_full | Preparation of SiC/Al2O3 composite materials from coal fly ash |
| title_fullStr | Preparation of SiC/Al2O3 composite materials from coal fly ash |
| title_full_unstemmed | Preparation of SiC/Al2O3 composite materials from coal fly ash |
| title_short | Preparation of SiC/Al2O3 composite materials from coal fly ash |
| title_sort | preparation of sic al2o3 composite materials from coal fly ash |
| topic | coal fly ash carbothermal reduction silicon carbide alumina composite materials |
| url | http://cje.ustb.edu.cn/article/doi/10.13374/j.issn2095-9389.2016.06.013 |
| work_keys_str_mv | AT liziyong preparationofsical2o3compositematerialsfromcoalflyash AT wuchunhan preparationofsical2o3compositematerialsfromcoalflyash AT yuqingchun preparationofsical2o3compositematerialsfromcoalflyash AT zhouyuezhen preparationofsical2o3compositematerialsfromcoalflyash AT liwei preparationofsical2o3compositematerialsfromcoalflyash AT yangbin preparationofsical2o3compositematerialsfromcoalflyash |