Effect of Spinel Kinds on Properties of Alumina—Spinel Castables

Qiu, Wendong; Ruan, Guozhi; Ouyang, Jun; Zhao, Yuxi; Xu, Guogang

doi:10.1111/ijac.12322

Cited by 6 publications

(12 citation statements)

References 18 publications

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“…The presence of the CA 6 and spinel phases as already mentioned also directly influenced the high resistance to thermal shock in the castables molded with resin. Similar results with addition of spinel particles of different granulometry were obtained in castables and in spinel composites [16,19,20,24].…”

Section: Results Of Cold Mechanical Strength Using the 3-point Bendinsupporting

confidence: 81%

Physical and mechanical properties of low, ultralow and no cement refractory castables containing MgO nanoparticles developed in situ by means of polymeric resins

Júnior

Baldo

2019

Cerâmica

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The introduction of MgO nanoparticles developed in situ in the matrix of high-alumina low cement, ultra-low and no cement refractory castables was made by means of a low viscosity containing aqueous polymeric resin, produced by the Pechini method. The addition of the liquid resin to the castables played two roles: first to serve as a supplier of mixing water and second as a precursor of nanoparticles of MgO, which were formed in situ in the castables matrices during firing. The results confirmed the benefits brought by the developed in situ MgO nanoparticles on the refractory properties of the investigated castables.

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Section: Results Of Cold Mechanical Strength Using the 3-point Bendinsupporting

confidence: 81%

Physical and mechanical properties of low, ultralow and no cement refractory castables containing MgO nanoparticles developed in situ by means of polymeric resins

Júnior

Baldo

2019

Cerâmica

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Section: Introductionmentioning

confidence: 99%

“…In recent years, with the diversification of liquid steel refining method, the working conditions of steel ladle are becoming more and more severe and the phenomenon of uneven corrosion of refractory materials used in steel ladle linings is very prominent. [1][2][3] This led to the occurrence of local damage (slag line, wall and bottom), reduced life spans and increased consumption of refractory materials. 4,5 Due to its advantages like, high resistance to thermomechanical stress, low thermal expansion, high resistance to change in the environment, etc., corundum-spinel castables have been widely used as a high temperature refractory material for applications in different metallurgical and nonmetallurgical processes in the recent years.…”

Section: Introductionmentioning

confidence: 99%

Properties of silica sol bonded corundum‐spinel castables for steel ladles

Qiu

Ruan

Zhang

2018

Int J Applied Ceramic Tech

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In order to overcome the shortcoming of the calcium aluminate cement (CAC) bonded castables, we prepared corundum‐spinel castables using silica sol as binder and tabular corundum, sintered magnesia‐alumina spinel, and reactive alumina as raw materials in this study. The effect of spinel grain size and solid content of silica sol on the flow value, sintering, mechanical strength and microstructure of the specimens treated at varying temperature of 400, 1000, 1500, and 1650°C for 5 hours in an air atmosphere were studied by SEM and EDS analyses. The results indicate that silica sol is suitable as a binder for corundum‐spinel systems. And silica sol with solid content of 25% bonded samples containing ≤90 μm spinel perform quite better than the others. At the same time, silica sol bonded samples had high strength in medium temperature. This is because that the closer proximity of silica sol and alumina powder and the high activity of nanometer SiO2 in silica sol are beneficial for the reaction of SiO2 and Al2O3 to generate mullite needed for reinforcement of castables matrix.

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“…Furthermore, Ko studied the effect of the total amount of fines on the thermal shock damage resistance of alumina–spinel castables, and concluded that a high total fines content would lead to poor thermal shock resistance. In addition, the effects of environmental conditions, in situ spinel formation, and spinel kinds on the slag resistance of the prepared alumina–magnesia castables were investigated. It is widely accepted that the thermal shock resistance and slag resistance can be modulated by microstructural control of the alumina–magnesia castable matrix …”

Section: Introductionmentioning

confidence: 99%

“…Alumina–magnesia castables have been considered potential replacements to alumina–chrome castables. Several studies have reported the thermal shock resistance and slag resistance of alumina–magnesia castables . Additives such as TiO 2 , SiO 2 , and ZrO 2 have been introduced into alumina–magnesia castables to improve their performance.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Durability of Purging Plugs Using MgO Micropowder for Refining Ladles

Huang

et al. 2016

Int J Applied Ceramic Tech

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To modulate the matrix of purging plugs, MgO micropowder was introduced as a replacement to magnesia powder in alumina–magnesia castables, and the effect of MgO micropowder on the properties of alumina–magnesia castables and the possibility of developing chrome‐free castables were investigated. Experimental results showed that the introduction of MgO micropowder resulted in an improvement in the volume stability, strength, and thermal shock resistance of alumina–magnesia castables due to its high surface energy and small particle size. However, excessive amounts of MgO micropowder led to a lower densification, and there was a slight degradation in the performance of the alumina–magnesia castables. The slag resistance of the prepared alumina–magnesia castables was significantly better than that of the alumina–chrome castables. Microstructure and energy spectrum analysis showed that the formation of a solidified reaction layer, mainly consisting of spinel and CaAl12O19, was the major cause of the observed difference in slag resistance. In addition, the alumina–magnesia castables had a lower linear thermal expansion coefficient than that of the alumina–chrome castables at each experimental temperature, which effectively decreased the thermal stress during its service period, thus exhibiting good thermal shock resistance.

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Effect of Spinel Kinds on Properties of Alumina—Spinel Castables

Cited by 6 publications

References 18 publications

Physical and mechanical properties of low, ultralow and no cement refractory castables containing MgO nanoparticles developed in situ by means of polymeric resins

Physical and mechanical properties of low, ultralow and no cement refractory castables containing MgO nanoparticles developed in situ by means of polymeric resins

Properties of silica sol bonded corundum‐spinel castables for steel ladles

Improvement of Durability of Purging Plugs Using MgO Micropowder for Refining Ladles

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