Thermal shock resistance of silica gel-modified magnesium carboxylate-bonded high alumina castables

IF 1.8 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Ceramic Technology Pub Date : 2024-06-29 DOI:10.1111/ijac.14845

Luyan Sun, Guoqing Xiao, Donghai Ding, Endong Jin, Changkun Lei, Xiaochuan Chong, Yuan Feng, Jianjun Chen, Chao Zou, Xin Zheng

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Abstract

Silica gel-modified hydratable magnesium carboxylate (HMC) is used as the binder for refractory castables. The mechanical strength and thermal shock resistance of HMC bonded and silica gel-modified HMC-bonded castables were compared. When the HMC/silica gel mass ratio is 2, the cold modulus of rupture, the hot modulus of rupture, the residual strength ratio after three-times water quenching tests, and the matrix-specific fracture energy of the castables were increased by 300%, 124%, 44.7%, and 132%, respectively, compared with HMC-bonded castables. The characterization of microstructure evolution of silica gel-modified HMC-bonded castables indicated that a small amount of liquid phase generated is conducive to improving the high-temperature mechanical properties. The in situ alumina-rich spinel and needle-like mullite toughened the matrix and enhanced the thermal shock resistance of the castables by “microcrack generation” and “preventing crack propagation” mechanisms.

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硅胶改性羧酸镁结合高铝浇注料的抗热震性

硅胶改性水合羧酸镁（HMC）被用作耐火浇注料的粘结剂。比较了 HMC 粘结浇注料和硅胶改性 HMC 粘结浇注料的机械强度和抗热震性。当 HMC/硅凝胶质量比为 2 时，浇注料的冷断裂模数、热断裂模数、三次水淬试验后的残余强度比和基体特定断裂能分别比 HMC 粘结浇注料提高了 300%、124%、44.7% 和 132%。硅胶改性 HMC 结合浇注料微观结构演变的表征表明，少量液相的产生有利于改善高温力学性能。原位富铝尖晶石和针状莫来石通过 "产生微裂纹 "和 "阻止裂纹扩展 "机制使基体增韧，增强了浇注料的抗热震性。

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来源期刊

International Journal of Applied Ceramic Technology 工程技术-材料科学：硅酸盐

CiteScore

3.90

自引率

9.50%

发文量

280

审稿时长

4.5 months

期刊介绍： The International Journal of Applied Ceramic Technology publishes cutting edge applied research and development work focused on commercialization of engineered ceramics, products and processes. The publication also explores the barriers to commercialization, design and testing, environmental health issues, international standardization activities, databases, and cost models. Designed to get high quality information to end-users quickly, the peer process is led by an editorial board of experts from industry, government, and universities. Each issue focuses on a high-interest, high-impact topic plus includes a range of papers detailing applications of ceramics. Papers on all aspects of applied ceramics are welcome including those in the following areas: Nanotechnology applications; Ceramic Armor; Ceramic and Technology for Energy Applications (e.g., Fuel Cells, Batteries, Solar, Thermoelectric, and HT Superconductors); Ceramic Matrix Composites; Functional Materials; Thermal and Environmental Barrier Coatings; Bioceramic Applications; Green Manufacturing; Ceramic Processing; Glass Technology; Fiber optics; Ceramics in Environmental Applications; Ceramics in Electronic, Photonic and Magnetic Applications;