Influence of magnesium-aluminum hydrotalcite on the microstructure and mechanical properties of magnesia castables

Zhang, Yu; Li, Yawei; Chen, Junfeng; Xue, Zhengliang

doi:10.1016/j.ceramint.2021.10.179

Cited by 10 publications

(3 citation statements)

References 29 publications

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“…Mg-Al hydrotalcite (MAT) exhibits a nanosized sheetlike structure, 25,26 which is similar to the sheetlike microcracks on the surface of HA particles. 5,23 It appears that the SSA and pore surface area (PSA) of HA can effectively be decreased once MAT sheets are inserted into the microcracks of the HA particles during grinding.…”

Section: Raw Materialsmentioning

confidence: 99%

Controlling hydration of hydratable alumina via co‐grinding with Mg–Al hydrotalcite

Chen

Zhang

2023

J Am Ceram Soc.

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The on-site industrial application of hydratable alumina (HA)-bonded castables is inhibited by the high hydration rate of HA. In this study, the hydration behavior of HA co-ground with sheetlike Mg-Al hydrotalcite (MAT) is investigated. The properties of castables bonded with MAT-bearing HA are systematically assessed. The hydration rate of HA co-ground MAT decreases as this allows MAT sheets to be effectively inserted into the microcracks of HA particles during grinding, thus decreasing the direct contact area between HA and water.The strength of MAT-bearing castables (0.5 and 1 wt%) fired at 800 • C improved slightly owning to the generation of magnesia-alumina spinel. The mechanical strength of castables fired at 1100 and 1550 • C decreased as the MAT content increased owing to an increase in porosity. Based on an analysis of the hydration behavior of HA and the properties of HA-bonded castables, the optimal MAT/HA weight ratio is approximately 1/10.

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Section: Raw Materialsmentioning

confidence: 99%

Controlling hydration of hydratable alumina via co‐grinding with Mg–Al hydrotalcite

Chen

Zhang

2023

J Am Ceram Soc.

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“…MgO-Al 2 O 3 refractories are widely used in steel making and cement production due to their excellent corrosion resistance and high-temperature mechanical properties. [1][2][3][4][5][6][7][8][9] In recent years, efficient thermal insulation refractories have been constantly studied for energy conservation and carbon emission reduction. [10][11][12][13][14] Among these, the lightweight design that used microporous aggregates instead of dense aggregates fabricating the working lining refractories was an efficient method for realizing energy conservation in high-temperature industries.…”

Section: Introductionmentioning

confidence: 99%

“…MgO–Al 2 O 3 refractories are widely used in steel making and cement production due to their excellent corrosion resistance and high‐temperature mechanical properties 1–9 . In recent years, efficient thermal insulation refractories have been constantly studied for energy conservation and carbon emission reduction 10–14 .…”

Section: Introductionmentioning

confidence: 99%

Microstructure and properties of microporous MgO–Al₂O₃ refractory aggregates from Mg(OH)₂ and Al(OH)₃

Yan,

Wang

et al. 2023

Int J Applied Ceramic Tech

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In this work, microporous MgO–Al2O3 refractory aggregates were prepared with Mg(OH)2 and Al(OH)3 via the in situ decomposition synthesis method. The effect of Al(OH)3 addition on the microstructure and properties of microporous MgO–Al2O3 refractory aggregates was investigated with scanning electron microscope and mercury intrusion porosimetry. The results indicated that the improved green density of the samples and the reaction sintering accelerated the mass transport rate with adding Al(OH)3 from 0 to 4.0 wt%. Besides, a small amount of Al3+ diffused into porous MgO particles, accelerating the merging and growth of nanopores in the porous MgO particles. The intra‐particle pore size and the densification degree of microparticles were increased, and thus the strength of the samples was improved. Due to the formation of Kirkendall voids by interdiffusion of Mg2+ and Al3+, the inter‐particle pore size increased. Adding Al(OH)3 from 4.0 to 17.6 wt%, the Kirkendall voids weakened the mass transport rate and improved the inter‐particle pore size. The merging and growth of nanopores in the MgO particles were limited, resulting in the reduced intra‐particle pore size and increased intra‐particle pore number. The densification degree of microparticles was reduced, and thus the strength of the samples decreased. At the Al(OH)3 addition of 4.0 wt%, microporous MgO–Al2O3 refractory aggregates had the best comprehensive properties, a bulk density of 2.48 g/cm3, an apparent porosity of 29.4%, a median pore size of 1.6 μm with 42.2 vol% nanopores and the thermal conductivity of 4.0 W/(m K).

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Reconstruction and hydration of hydrotalcite response to thermal activation temperature: Enhancement of properties for magnesia castables

Zhang

Wang

Chen

et al. 2022

Ceramics International

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Influence of magnesium-aluminum hydrotalcite on the microstructure and mechanical properties of magnesia castables

Cited by 10 publications

References 29 publications

Controlling hydration of hydratable alumina via co‐grinding with Mg–Al hydrotalcite

Controlling hydration of hydratable alumina via co‐grinding with Mg–Al hydrotalcite

Microstructure and properties of microporous MgO–Al₂O₃ refractory aggregates from Mg(OH)₂ and Al(OH)₃

Reconstruction and hydration of hydrotalcite response to thermal activation temperature: Enhancement of properties for magnesia castables

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Influence of magnesium-aluminum hydrotalcite on the microstructure and mechanical properties of magnesia castables

Cited by 10 publications

References 29 publications

Controlling hydration of hydratable alumina via co‐grinding with Mg–Al hydrotalcite

Controlling hydration of hydratable alumina via co‐grinding with Mg–Al hydrotalcite

Microstructure and properties of microporous MgO–Al2O3 refractory aggregates from Mg(OH)2 and Al(OH)3

Reconstruction and hydration of hydrotalcite response to thermal activation temperature: Enhancement of properties for magnesia castables

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Product

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Microstructure and properties of microporous MgO–Al₂O₃ refractory aggregates from Mg(OH)₂ and Al(OH)₃