Effects of rare earth oxides additions on microstructure and properties of alumina-magnesia refractory castables

Yuan, Wenjie; Zhu, Qing; Deng, Chengji; Zhu, Hui

doi:10.1016/j.ceramint.2017.02.082

Cited by 26 publications

(20 citation statements)

References 25 publications

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“…However, the formation of CA 6 and spinel leads to volume expansions of 3.01 and 8%, respectively, which would result in the spalling of castables at elevated temperatures [8]. Thus, mineralizers, such as TiO 2 , B 2 O 3 , ZrO 2 , and rare earth oxides, have been introduced into this system to accelerate the densification of castables [9,10].…”

Section: Introductionmentioning

confidence: 99%

Investigating the Action Mechanism of Titanium in Alumina–Magnesia Castables by Adding Different Ti-Bearing Compounds

2022

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To investigate the action mechanism of titanium, the effects of different Ti-bearing compounds, including CaTiO3, MgTiO3, and nano-TiO2, on the properties of alumina–magnesia castables were studied. By analyzing the phase compositions, microstructures, and physical and mechanical properties of the castables, it was demonstrated that an intermediate product, CaTiO3, was first generated. This was then consumed by solid-solution reactions, and titanium was involved in the liquid formation as the temperature increased. The solid-solution reaction of CA6 (CaAl12O19) was more prominent due to the incorporation of more titanium in the crystal lattice of CA6 instead of spinel (MgAl2O4). Moreover, the liquid formation was strongly promoted when more titanium accompanied the calcium, which finally accelerated the densification and improved the strengths of alumina–magnesia castables. On the whole, castables with CaTiO3 addition presented higher bulk density and excellent strength after the heat treatment. Besides, the castables with 2 wt.% CaTiO3 contents were estimated to possess greater thermal shock resistance.

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Section: Introductionmentioning

confidence: 99%

Investigating the Action Mechanism of Titanium in Alumina–Magnesia Castables by Adding Different Ti-Bearing Compounds

2022

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“…For example, the densification of MgO‐CaO refractories has been promoted obviously doped with CeO 2 . Yuan et al have demonstrated that Y 2 O 3 and CeO 2 presented varying degrees of influence on in situ reactions and volumetric stability of castables and can be used as the comprehensive evaluation for design of alumina‐magnesia refractory castables . Quan et al have demonstrated that the addition of CeO 2 can promote the sintering properties of magnesium aluminate spinel ceramic powders .…”

Section: Introductionmentioning

confidence: 99%

Effect of CeO₂ addition on the sintering behavior of the alumina‐rich calcium aluminate ceramics

Wen

Yuan

Jin

et al. 2020

Int J Applied Ceramic Tech

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In this work, the CaAl4O7 ceramics and CaAl12O19 ceramics were fabricated by the solid‐state sintering technology and the effects of CeO2 as the additive on their sintering behavior subjected to sintering at temperatures of 1500°C, 1550°C, and 1600°C were investigated. It was demonstrated that the bulk densities of the CaAl4O7 ceramics and CaAl12O19 ceramics increased about 23.8% and 24.2% after adding 3.0 wt% of CeO2 than that of the samples without additives. Meanwhile, an increase in lattice parameters occurred in the CaAl4O7 ceramics and CaAl12O19 ceramics. The CeO2 could form the solid solution in the CaAl4O7 ceramics, inducing the lattice distortion and the activation of the lattice. The Ce4+ in CeO2 could be dissolved in the structure of CaAl12O19 phase and result in the structural defects, which would accelerate ion exchange and promote the in situ reaction of synthetic products. These behaviors could promote the sintering process of the CaAl4O7 ceramics and CaAl12O19 ceramics and improve their sinterability. Moreover, a considerable increase in bulk density occurred in both CaAl4O7 ceramics and CaAl12O19 ceramics with increasing sintering temperatures due to the greater densification obtained from the enhanced mass transport at elevated temperatures.

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“…In recent years, a considerable number of studies have focused on enhancing the densification of reaction sintered MgAl 2 O 4 at lower temperatures by the use of various additives . For example, the addition of TiO 2 , B 2 O 3 , LiF, ZnF 2 , BaF 2 , and CaF 2 would reduce the sintering temperature of MgAl 2 O 4 , while Fe 2 O 3 and CaO facilitate liquid‐phase sintering.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, a considerable number of studies have focused on enhancing the densification of reaction sintered MgAl 2 O 4 at lower temperatures by the use of various additives. [10][11][12][13][14][15][16][17] 20,21 reported that the addition of ZnO can enhance the sintering, densification, hot strength, and thermal shock resistance of reaction sintered MgAl 2 O 4 . For example, ZnO can react with Al 2 O 3 to form ZnAl 2 O 4 , and ZnAl 2 O 4 has been increasingly employed as a catalytic agent due to its high melting point (1950°C), low coefficient of thermal expansion (7.0 × 10 −6°C−1 in the range of 25-900°C), good thermal stability, and preferable acid-base resistance and alkali resistance.…”

Section: Introductionmentioning

confidence: 99%

Effects of ZnO addition on the sintering behavior and mechanical properties of magnesium aluminate spinel ceramics

Liu

Wang

Liu

et al. 2019

Int J Ceramic Engine & Sci

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This article discusses the successful preparation of high‐strength solid solution spinel ceramics via a solid‐state reaction sintering process employing MgAl2O4. The effects of ZnO content on the sintering behavior, bulk density, apparent porosity, phase composition, microstructure, cold modulus of rupture, and modulus of elasticity of the MgAl2O4‐based ceramics are investigated. The results show that the formed MgAl2O4‐based ceramics represent an MgAl2O4–ZnO solid solution, which markedly improves the sinterability, densification, and mechanical properties of the pure MgAl2O4 ceramic and decreases the sintering activation energy.

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Effects of rare earth oxides additions on microstructure and properties of alumina-magnesia refractory castables

Cited by 26 publications

References 25 publications

Investigating the Action Mechanism of Titanium in Alumina–Magnesia Castables by Adding Different Ti-Bearing Compounds

Investigating the Action Mechanism of Titanium in Alumina–Magnesia Castables by Adding Different Ti-Bearing Compounds

Effect of CeO₂ addition on the sintering behavior of the alumina‐rich calcium aluminate ceramics

Effects of ZnO addition on the sintering behavior and mechanical properties of magnesium aluminate spinel ceramics

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Effects of rare earth oxides additions on microstructure and properties of alumina-magnesia refractory castables

Cited by 26 publications

References 25 publications

Investigating the Action Mechanism of Titanium in Alumina–Magnesia Castables by Adding Different Ti-Bearing Compounds

Investigating the Action Mechanism of Titanium in Alumina–Magnesia Castables by Adding Different Ti-Bearing Compounds

Effect of CeO2 addition on the sintering behavior of the alumina‐rich calcium aluminate ceramics

Effects of ZnO addition on the sintering behavior and mechanical properties of magnesium aluminate spinel ceramics

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Effect of CeO₂ addition on the sintering behavior of the alumina‐rich calcium aluminate ceramics