Heat-Insulating Refractory Material Based on Hollow Corundum Microspheres

Krasnyi, B. L.; Тарасовский, В. П.; Krasnyi, A. B.; Galganova, A. L.; Резниченко, А. В.

doi:10.1007/s11148-015-9764-x

Cited by 4 publications

(2 citation statements)

References 3 publications

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“…In order to improve the thermal insulation performance of castables and reduce their heat storage loss, lightweight porous aggregates are often used instead of traditional dense aggregates. [4][5][6][7][8] At present, the representative high-strength lightweight aggregates include hollow corundum spherical aggregates, 9,10 lightweight microporous mullite aggregates, 11 and lightweight microporous bauxite aggregates. 12 The bulk density and thermal conductivity of the castables prepared with these lightweight aggregates are extremely low, but their key properties such as strength and thermal shock are still insufficient to meet the requirements of tundish permanent linings, and the prices of high-strength lightweight aggregates are much higher than that of traditional aggregates.…”

Section: Introductionmentioning

confidence: 99%

A low bulk density, low thermal conductivity permanent lining castable for tundish obtained by adding pearlescent sand

Wang

Yang

Zhang

et al. 2023

Int J Applied Ceramic Tech

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The precise control of molten steel temperature in tundish is a key factor to ensure the quality of the cast billets, so it is important to develop permanent lining castables for tundish with low thermal conductivity and bulk density. In this work, the hydrophobic modification of pearlescent sand was carried out with hydrogen silicone oil, and 3% of modified pearlescent sand was added to mullitebauxite castable to realize its low thermal conductivity and light weight. It is found that modified pearlescent sand still has good hydrophobicity at 350 • C, the addition of modified pearlescent sand effectively increases the apparent porosity and reduces the bulk density of the castable. At 1500 • C, the bulk density of modified pearlescent sand-castable is 25.54% less than that of conventional castable.Compared with conventional castable, the mechanical properties and thermal shock resistance of modified pearlescent sand castable are worse, but they are sufficient to meet the use conditions of tundish permanent lining castable. At 600-1000 • C, the thermal conductivity of the modified pearlescent sand castable is about 30% lower than that of the conventional castable, which proves that the addition of modified pearlescent sand can significantly improve the thermal insulation performance of mullite-bauxite castable.

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Section: Introductionmentioning

confidence: 99%

A low bulk density, low thermal conductivity permanent lining castable for tundish obtained by adding pearlescent sand

Wang

Yang

Zhang

et al. 2023

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

show abstract

“…In terms of increasing the thermal shock resistance of refractories by inhibiting cracks, a certain positive effect can be achieved by using additives with particle of a spherical shape, such as hollow corundum microspheres (HCM), which, also, have a low thermal conductivity and low sintering activity [ 15 , 16 ]. Authors of [ 17 ] found that HCM improve mullite castables’ thermal shock resistance and explain this effect by the strong bonding at the microsphere and matrix interface, when the crack propagation is stopped at the corundum microsphere.…”

Section: Introductionmentioning

confidence: 99%

Effect of Hollow Corundum Microspheres Additive on Physical and Mechanical Properties and Thermal Shock Resistance Behavior of Bauxite Based Refractory Castable

et al. 2021

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This paper analyses the effect of hollow corundum microspheres (HCM) on both physical-mechanical properties (density, ultrasonic pulse velocity, modulus of elasticity, and compressive strength) and thermal shock resistance behavior of refractory medium cement castable with bauxite aggregate. Moreover, the scanning electron microscopy (SEM) results of HCM and refractory castable samples are presented in the paper. It was found that the replacement of bauxite of 0–0.1 mm fraction by HCM (2.5%, 5%, and 10% by weight of dry mix) had no significant effect on the density and compressive strength of castable, while the modulus of elasticity decreased by 15%. Ultrasonic pulse velocity (Vup) values and the visual analysis of the samples after thermal cycling showed that a small amount of HCM in composition of refractory castable could reduce the formation and propagation of cracks and thus increase its thermal shock resistance.

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Permanent lining castable with low bulk density and thermal conductivity: bauxite castable for tundish obtained by adding pearlescent sand

Wang,

Yang,

Wang

et al. 2023

J. Iron Steel Res. Int.

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Heat-Insulating Refractory Material Based on Hollow Corundum Microspheres

Cited by 4 publications

References 3 publications

A low bulk density, low thermal conductivity permanent lining castable for tundish obtained by adding pearlescent sand

A low bulk density, low thermal conductivity permanent lining castable for tundish obtained by adding pearlescent sand

Effect of Hollow Corundum Microspheres Additive on Physical and Mechanical Properties and Thermal Shock Resistance Behavior of Bauxite Based Refractory Castable

Permanent lining castable with low bulk density and thermal conductivity: bauxite castable for tundish obtained by adding pearlescent sand

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