Enhanced mechanical performance of Al₂O₃-C refractories with nano carbon black and in-situ formed multi-walled carbon nanotubes (MWCNTs)

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• 作者：Ning Liao^a ; Yawei Li^a ; ^{liyawei@wust.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Shengli Jin^b ; Shaobai Sang^a ; Harald Harmuth^b
• 关键词：In-situ formation MWCNTs ; Mechanical properties ; Thermal shock resistance ; Al2O3-C refractories
• 刊名：Journal of the European Ceramic Society
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：36
• 期：3
• 页码：867-874
• 全文大小：3846 K

文摘

The mechanical performance of low-carbon Al₂O₃-C refractories can be further enhanced using the in-situ formation approach of MWCNTs. Evidently, the nickel nitrate catalyst in the matrix benefit the improved mechanical properties of Al₂O₃-C refractories after coking at elevated temperatures. The in-situ formation of MWCNTs and SiC whiskers contributes to their higher cold modulus of rupture. Moreover, dispersing catalyst into the binder solution promotes a fabric-like structure interlaced through MWCNTs and SiC whiskers in the binder system and thus a better bonding strength can be achieved. Compared to the Al₂O₃-C refractories with a close starting carbon content fabricated by adding as-received MWCNTs or the combined carbon sources of nano carbon black and flake graphite, superior thermal shock resistances were attained with the approaches presented in this paper. Additionally, MWCNTs are more influential to the toughening and SiC whiskers are more responsible for the strengthening behaviors.