Study on cobweb‐like carbon nanotubes/calcium aluminate cement and its effect on the properties of Al2O3–SiC–C castables

Cobweb‐like carbon nanotubes/calcium aluminate cement (CNTs/CAC) were synthesized through catalytic sintering with citric acid, calcium carbonate, and alumina as raw materials and ferric chloride as catalyst precursor. The products were characterized by X‐ray diffractometry, scanning electron micros...

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Bibliographic Details
Published in:International journal of applied ceramic technology 2022-01, Vol.19 (1), p.557-568
Main Authors: Zang, Yunfei, Xiao, Guoqing, Ding, Donghai, Chen, Jianjun, Lei, Changkun, Luo, Jiyuan, Chong, Xiaochuan
Format: Article
Language:English
Subjects:
Al2O3–SiC–C castables
Aluminous cements
Aluminum oxide
Bamboo
Bituminous cements
Bonding
Calcium aluminate
calcium aluminate cement
Calcium carbonate
calcium citrate
Carbon
carbon nanotubes
Catalysis
Cement
Chemical synthesis
Citric acid
Electron microscopy
Ferric chloride
High aspect ratio
Microscopy
Multi wall carbon nanotubes
Oxidation
Oxidation resistance
Raman spectroscopy
Raw materials
Residual strength
Shock resistance
Thermal resistance
Thermal shock
thermal shock resistance
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Summary:Cobweb‐like carbon nanotubes/calcium aluminate cement (CNTs/CAC) were synthesized through catalytic sintering with citric acid, calcium carbonate, and alumina as raw materials and ferric chloride as catalyst precursor. The products were characterized by X‐ray diffractometry, scanning electron microscopy, Raman spectroscopy, and high‐resolution transmission electron microscopy. The in situ cobweb‐like carbon firmly bonded between calcium aluminate grains, which endows the better oxidation resistance and water dispersion of carbon. The research had also shown that the bamboo‐like multiwalled carbon nanotubes with high aspect ratio were formed in cement by catalysis, which were entangled and aggregated to form cobweb‐like carbon. CNTs/CAC was applied in the Al2O3–SiC–C castables as a binder. Compared with the castables with spherical asphalt and in situ high‐content carbon‐containing calcium aluminate cement (HCCAC) as carbon source, the oxidation resistance index ratio of the castables bonded with CNTs/CAC increased by 45% and 22%, and the residual strength ratio increased by 25% and 20%, respectively. The results indicated that the oxidation resistance and thermal shock of the Al2O3–SiC–C castables bonded with CNTs/CAC were significantly improved.
ISSN:1546-542X
1744-7402
DOI:10.1111/ijac.13905