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Effect of Silica Sol Impregnated Recycled Aggregates of Spent Mullite-SiC Bricks on Performance of Al2O3-SiC-C Castables
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Chao SANG, Guoqing XIAO, Donghai DING, Changkun LEI, Yunfei ZANG, Chao FENG
Journal of the Chinese Ceramic Society | 2022, 50(3) : 828 - 838
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Journal of the Chinese Ceramic Society | 2022, 50(3): 828-838
• Research Articles •
Effect of Silica Sol Impregnated Recycled Aggregates of Spent Mullite-SiC Bricks on Performance of Al2O3-SiC-C Castables
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Chao SANG, Guoqing XIAO, Donghai DING, Changkun LEI, Yunfei ZANG, Chao FENG
Affiliations
  • College of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China

    • SANG Chao (1996-), male, Master candidate. E-mail:

About Author:

SANG Chao (1996-), male, Master candidate. E-mail:

Published: 2022-03-20 doi: 10.14062/j.issn.0454-5648.20210614
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For the improvement of the fluidity of castables with recycled aggregates of mullite-SiC bricks due to their high porosity, high water absorption and massive cracks, silica sol was used to impregnate mullite-SiC brick aggregates. The effect of silica sol concentration on the aggregate properties of mullite-SiC bricks was investigated. The microstructures and the element distributions of modified mullite-SiC bricks aggregate were analyzed by scanning electron microscopy coupled with energy dispersive spectroscopy. The water wettability of mullite-SiC brick aggregates was characterized via water contact angle measurement. The results show that after the impregnation of mullite-SiC brick aggregates, the water absorption of mullite-SiC brick aggregate reduces from 6.9% to 2.6%, and the water contact angle decreases from 55° to 7°, thus improving the water wettability of the aggregate. The impregnated mullite-SiC bricks were used as recycled aggregates instead of brown corundum in Al2O3-SiC-C castables. In addition, the effect of aggregates on the properties of castables was also investigated. The results indicate that Al2O3-SiC-C refractory castables with silica sol concentration of 15% modified mullite-SiC bricks aggregates after heat-treated at 1 450 ℃ have the minimum apparent porosity of 17.1% and the maximum cold compressive strength of 73.7 MPa, which is 45.7% greater than the strength of castables with brown corundum as aggregates. Meanwhile, the residual strength and the residual strength ratio of castables after thermal shock are increased by 69.4% and 24.1%, respectively.

spent mullite-silicon carbide brick  /  recycled aggregates  /  alumica-silicon carbide-carbon iron trough castables  /  silica sol  /  thermal shock resistance
桑超, 肖国庆, 丁冬海, 雷长坤, 臧云飞, 冯超. 硅溶胶浸渍硅莫砖再生骨料对Al2O3-SiC-C浇注料性能的影响. 硅酸盐学报, 2022 , 50 (3) : 828 -838 . DOI: 10.14062/j.issn.0454-5648.20210614
Chao SANG, Guoqing XIAO, Donghai DING, Changkun LEI, Yunfei ZANG, Chao FENG. Effect of Silica Sol Impregnated Recycled Aggregates of Spent Mullite-SiC Bricks on Performance of Al2O3-SiC-C Castables[J]. Journal of the Chinese Ceramic Society, 2022 , 50 (3) : 828 -838 . DOI: 10.14062/j.issn.0454-5648.20210614
Appendix
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Year 2022 volume 50 Issue 3
19
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Article Info
doi: 10.14062/j.issn.0454-5648.20210614
  • Receive Date：2021-07-28
  • Online Date：2026-10-22
  • Published：2022-03-20
Article Data
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History
  • Received：2021-07-28
  • Revised：2021-08-20
Funding
Affiliations
    College of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China

Corresponding:

XIAO Guoqing (1967-), Male, Professor. E-mail:
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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