Effects of oxidation of SiC aggregates on the sintering behaviour and microstructures of SiC-CaAl12O19 composite refractories
In order to develop chrome-free refractory materials applicable in coal slurry gasification, SiC-CaAl12O19 (SiC-CA6) composite refractories were developed and prepared by using SiC aggregates and CA6 powders as main raw materials. The sintering behaviour of the composites was investigated. After fir...
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| Formato: | Artigo |
| Idioma: | English |
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University of Novi Sad
2021-03-01
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| Colecção: | Processing and Application of Ceramics |
| Assuntos: | |
| Acesso em linha: | http://www.doiserbia.nb.rs/img/doi/1820-6131/2021/1820-61312101011S.pdf |
| _version_ | 1828963471086059520 |
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| author | Si Yaochen Xia Miao Li Hongxia Sun Honggang Guo Ang Du Yihao Zhao Shixian Shang Xinlian Chen Yongqiang |
| author_facet | Si Yaochen Xia Miao Li Hongxia Sun Honggang Guo Ang Du Yihao Zhao Shixian Shang Xinlian Chen Yongqiang |
| author_sort | Si Yaochen |
| collection | DOAJ |
| description | In order to develop chrome-free refractory materials applicable in coal slurry gasification, SiC-CaAl12O19 (SiC-CA6) composite refractories were developed and prepared by using SiC aggregates and CA6 powders as main raw materials. The sintering behaviour of the composites was investigated. After firing at different temperatures under CO atmosphere, the effects of oxidation of SiC aggregates on the sintering behaviour and microstructures of SiC-CA6 composite refractorieswere investigated. SiC-CA6 composites could not be sintered when firing temperature was lower than 1500°C. SiC had a passive oxidation and the oxidation components were able to react with CA6 to form CaAl2Si2O8. The CaAl2Si2O8 melted into liquid when sintering temperature was in the range of 1500-1600°C, which promoted the sintering process of the SiC-CA6 composites. At temperatures above 1600 °C, an active oxidation of SiC occurred. Simultaneously, SiC could also reacted with the SiO2(s,l) to form SiO, leading to the precipitation of Al2O3 and CaO in the liquid to generate plate-like CA6. Above this temperature, the sintering of the SiC-CA6 composite refractories was affected by the growth of CA6 and oxidation of SiC. This work demonstrates that the optimal sintering temperature for the SiC-CA6 composite refractories was 1600°C. |
| first_indexed | 2024-12-14T10:28:45Z |
| format | Article |
| id | doaj.art-0b57a23bdc5b4f4293d1ef4b51ffecd3 |
| institution | Directory Open Access Journal |
| issn | 1820-6131 2406-1034 |
| language | English |
| last_indexed | 2024-12-14T10:28:45Z |
| publishDate | 2021-03-01 |
| publisher | University of Novi Sad |
| record_format | Article |
| series | Processing and Application of Ceramics |
| spelling | doaj.art-0b57a23bdc5b4f4293d1ef4b51ffecd32022-12-21T23:06:12ZengUniversity of Novi SadProcessing and Application of Ceramics1820-61312406-10342021-03-01151111810.2298/PAC2101011SEffects of oxidation of SiC aggregates on the sintering behaviour and microstructures of SiC-CaAl12O19 composite refractoriesSi Yaochen0Xia Miao1Li Hongxia2Sun Honggang3Guo Ang4Du Yihao5Zhao Shixian6Shang Xinlian7Chen Yongqiang8State Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang Henan, ChinaState Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang Henan, ChinaState Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang Henan, ChinaState Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang Henan, China + School of Materials Science and Engineering, University of Science & Technology Beijing, Beijing, ChinaState Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang Henan, ChinaState Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang Henan, ChinaState Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang Henan, ChinaState Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang Henan, ChinaSchool of Materials Science and Engineering, Zhengzhou University, Henan, ChinaIn order to develop chrome-free refractory materials applicable in coal slurry gasification, SiC-CaAl12O19 (SiC-CA6) composite refractories were developed and prepared by using SiC aggregates and CA6 powders as main raw materials. The sintering behaviour of the composites was investigated. After firing at different temperatures under CO atmosphere, the effects of oxidation of SiC aggregates on the sintering behaviour and microstructures of SiC-CA6 composite refractorieswere investigated. SiC-CA6 composites could not be sintered when firing temperature was lower than 1500°C. SiC had a passive oxidation and the oxidation components were able to react with CA6 to form CaAl2Si2O8. The CaAl2Si2O8 melted into liquid when sintering temperature was in the range of 1500-1600°C, which promoted the sintering process of the SiC-CA6 composites. At temperatures above 1600 °C, an active oxidation of SiC occurred. Simultaneously, SiC could also reacted with the SiO2(s,l) to form SiO, leading to the precipitation of Al2O3 and CaO in the liquid to generate plate-like CA6. Above this temperature, the sintering of the SiC-CA6 composite refractories was affected by the growth of CA6 and oxidation of SiC. This work demonstrates that the optimal sintering temperature for the SiC-CA6 composite refractories was 1600°C.http://www.doiserbia.nb.rs/img/doi/1820-6131/2021/1820-61312101011S.pdffiring temperaturesic-ca6 composite refractoriesoxidationmicrostructures |
| spellingShingle | Si Yaochen Xia Miao Li Hongxia Sun Honggang Guo Ang Du Yihao Zhao Shixian Shang Xinlian Chen Yongqiang Effects of oxidation of SiC aggregates on the sintering behaviour and microstructures of SiC-CaAl12O19 composite refractories Processing and Application of Ceramics firing temperature sic-ca6 composite refractories oxidation microstructures |
| title | Effects of oxidation of SiC aggregates on the sintering behaviour and microstructures of SiC-CaAl12O19 composite refractories |
| title_full | Effects of oxidation of SiC aggregates on the sintering behaviour and microstructures of SiC-CaAl12O19 composite refractories |
| title_fullStr | Effects of oxidation of SiC aggregates on the sintering behaviour and microstructures of SiC-CaAl12O19 composite refractories |
| title_full_unstemmed | Effects of oxidation of SiC aggregates on the sintering behaviour and microstructures of SiC-CaAl12O19 composite refractories |
| title_short | Effects of oxidation of SiC aggregates on the sintering behaviour and microstructures of SiC-CaAl12O19 composite refractories |
| title_sort | effects of oxidation of sic aggregates on the sintering behaviour and microstructures of sic caal12o19 composite refractories |
| topic | firing temperature sic-ca6 composite refractories oxidation microstructures |
| url | http://www.doiserbia.nb.rs/img/doi/1820-6131/2021/1820-61312101011S.pdf |
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