Regulation of Pore Structure and High-temperature Fracture Behavior of CAC-bonded Alumina-Spinel Castables Based on Hydration Design

doi:10.19691/j.cnki.1004-4493.2024.03.004

China's Refractories ›› 2024, Vol. 33 ›› Issue (3): 22-29.DOI: 10.19691/j.cnki.1004-4493.2024.03.004

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Regulation of Pore Structure and High-temperature Fracture Behavior of CAC-bonded Alumina-Spinel Castables Based on Hydration Design

Wenjing LIU¹, Ning LIAO^1,2,3*, Yawei LI^1,2,3

1 The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;
2 National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan 430081, China;
3 Joint International Research Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China

Online:2024-09-15 Published:2024-10-30
Contact: *e-mail: liaoning@wust.edu.cn
About author:Liu Wenjing received her B.S. degree in 2020 and is a PhD candidate in Materials Science and Engineering at Wuhan University of Science and Technology, where she is supervised by Prof. Li Yawei. Her research fields are the regulation of the hydration behavior of calcium aluminate cement and the composition and structure design of monolithic refractory castables aiming to refine the pore structure and optimize the resistance to thermal shock damage of castables. The group’s research areas include advanced refractory preparation technology, thermal-mechanical characterization of refractories, structural design and optimization of furnace linings, numerical simulation of refractory service performance, high-performance ceramics sintering technology, high-temperature functional coatings, and porous media burners.

Abstract

Abstract: The lamellar hydrates of CAC were designed with the introduction of nano CaCO₃ or Mg-Al hydrotalcite (M-A-H), and the effects on the green strength, pore structures, and high-temperature fracture behavior of alumina-spinel castables were investigated. The results show that nano CaCO₃ or M-A-H stimulates rapidly the hydration of CAC and the formation of lamellar C₄AcH₁₁ or coexistence of C₂AH₈ and C₄AcH₁₁ at 25 °C. The formation of lamellar hydrates can contribute to a more complicated pore structure, especially in the range of 400-2 000 nm. Meanwhile, the incorporation of well-distributed CaO or MgO sources from nano CaCO₃ or M-A-H also regulates the distribution of CA₆ and spinel (pre-formed and in-situ). Consequently, the optimized microstructure and complicated pore structure can induce the deflection and bridging of cracks, thus facilitating the consumption of fracture energy and enhancing the resistance to thermal stress damage.

Key words: alumina-spinel castables, lamellar hydrates, pore structure, high-temperature wedge splitting test, fracture behavior

Wenjing LIU, Ning LIAO, Yawei LI. Regulation of Pore Structure and High-temperature Fracture Behavior of CAC-bonded Alumina-Spinel Castables Based on Hydration Design[J]. China's Refractories, 2024, 33(3): 22-29.

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Regulation of Pore Structure and High-temperature Fracture Behavior of CAC-bonded Alumina-Spinel Castables Based on Hydration Design

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