Graphene nanosheets hydrothermally armored with nano-MgAl hydrotalcite: A synergistic nanocomposite boosting high-temperature properties of alumina-spinel castables

IF 6.2 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2025-09-29 DOI:10.1016/j.jeurceramsoc.2025.117854

Junyi Lv , Hang Li , Jinlong Wang , Shaowei Zhang , Yage Li , Haijun Zhang

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引用次数: 0

Abstract

Flake graphite (FG) limits the development of high-performance carbon-containing castables due to its inherent hydrophobicity. In this study, a graphene nanosheet/nano-MgAl hydrotalcite (GN/MAH) composite powder was successfully synthesized via a hydrothermal method. Under optimal conditions, the water contact angle of the composite powder was reduced from 103.6° for GNs to 44.6°, indicating significantly improved hydrophilicity. The incorporation of the GN/MAH composite powder markedly enhanced the mechanical performance of the castables after heat treatment at 1600 °C. Compared with the reference sample (0#), the cold modulus of rupture and hot modulus of rupture increased by 77.22 % and 54.91 %, respectively. Furthermore, the uniform dispersion of GNs within the castable matrix facilitated the maintenance of superior high-temperature performance even with a reduced carbon content of ∼0.15 wt%. As a result, the residual strength ratio of the castable after thermal shock increased by 13.69 %, while the slag corrosion index decreased by 43.26 %.

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石墨烯纳米片水热包覆纳米mgal水滑石：一种提高铝尖晶石浇注料高温性能的协同纳米复合材料

片状石墨由于其固有的疏水性限制了高性能含碳浇注料的发展。本研究通过水热法制备了石墨烯纳米片/纳米mgal水滑石复合粉体。在最佳条件下，复合粉体的水接触角由GNs的103.6°降低到44.6°，亲水性明显提高。GN/MAH复合粉体的掺入显著提高了浇注料在1600℃热处理后的力学性能。与参考样品（0#）相比，冷断裂模量和热断裂模量分别提高了77.22 %和54.91 %。此外，即使碳含量降低到0.15 wt%， GNs在浇注基体内的均匀分散也有助于保持优异的高温性能。结果表明，热冲击后浇注料的残余强度比提高13.69 %，渣腐蚀指数降低43.26 %。

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.