Effect of ZrO2 Addition on Densification and Mechanical Properties of MgAl2O4–CaAl4O7–CaAl12O19 Composite

Xu, Lei; Chen, Min; Jin, Liang-yu; Yin, Xiaowei; Wang, Nan; Liu, Lei

doi:10.1111/jace.13955

Cited by 27 publications

(3 citation statements)

References 35 publications

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“…The volume expansion of CAB and RMB castables was mainly due to the in situ formation of calcium aluminates (Figure 4E,F) and Mg(Al, Cr) 2 O 4 spinel (Figures 4A,B), respectively, accompanied by volume expansion. Since the volume expansion brought by the in situ formation of calcium aluminates (13.6% CaO·2Al 2 O 3 and 3.6% CA 6 ) 26–29 was higher than that of in situ spinel (8%), 1,20,30 a larger PLC of CAB castable had been achieved. This result suggested that the volume stability of RMB castable was better than that of CAB.…”

Section: Discussionmentioning

confidence: 98%

Corrosion mechanism of reactive MgO‐bonded Cr₂O₃‐bearing castables in CaO–Al₂O₃–Fe₂O₃–SiO₂‐based steel‐making slag

Zhang,

Wang,

Jia

et al. 2023

J Am Ceram Soc.

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To assess the feasibility of the reactive MgO (RM) binder in preparing Cr2O3‐bearing castables, the degradation behavior of RM‐bonded Cr2O3‐bearing castables in CaO–Al2O3–Fe2O3–SiO2‐based steel‐making slag was investigated at 1600°C via refractory cup testing. The corrosion resistance and infiltration resistance of RM‐bonded castables were compared with hydratable alumina (HA)‐bonded and calcium aluminate cement (CAC)‐bonded castables with respect to the differences in phase composition and microstructure. Al2O3 grains in RM‐bonded castable were preferentially attacked by the slag compared with Mg(Al, Cr)2O4 spinel‐based matrix. The formation of spinel‐based and CaO·6Al2O3‐based solid solutions with volume expansion from slag/castable interactions suppressed slag infiltration into RM‐bonded castable matrix. Both experimental observations and thermodynamic calculations indicated that the in situ formed Mg(Al, Cr)2O4 spinel in RM‐bonded castables was the predominant reason leading to the superior slag corrosion resistance and infiltration resistance compared with HA‐bonded and CAC‐bonded Cr2O3‐bearing castables.

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Section: Discussionmentioning

confidence: 98%

Corrosion mechanism of reactive MgO‐bonded Cr₂O₃‐bearing castables in CaO–Al₂O₃–Fe₂O₃–SiO₂‐based steel‐making slag

Zhang,

Wang,

Jia

et al. 2023

J Am Ceram Soc.

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“…Calcium hexaaluminate with the formula CaO·6Al 2 O 3 is the phase containing the highest Al 2 O 3 content in CaO–Al 2 O 3 system. Owing to the excellent overall performance including light weight, high melting point, excellent strength, good thermal shock resistance, and good thermal insulation, CA 6 has become one of the classic refractories in recent years 2–5 …”

Section: Introductionmentioning

confidence: 99%

Preparation of Zr⁴⁺ doped calcium hexaaluminate with improved slag penetration resistance

et al. 2021

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Aiming to improve the density of calcium hexaaluminate (CA6), Zr4+ doped CA6 with the structural formula of CaAl11.73◊0.25Zr0.02O18.41◊0.59 (CaAl11.73Zr0.02O18.41) was successfully synthesized at 1600℃ for 4 h in air. The effect of Zr4+ doping on the crystal structure of CA6 was investigated using first principle calculation, structure refinement in combination with experimental characterization. The results suggest that Zr4+ prefers to substitute the Al3+ at Al3 site, which can increase the lattice parameter of c‐axis and the amount of Al vacancies. The average thickness of Zr4+ doped CA6 is increased by approximate 36% in comparison with the pure one. In addition, molecular dynamics (MD) simulation indicates that Zr4+ doping can reduce the wettability of CA6 to slag to some extent. The reaction test method was carried out and it shows that CA6 with Zr4+ doping possesses better slag penetration resistance. Based on this, the reaction mechanism is also discussed.

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“…In our previous work, CaO‐MgO‐Al 2 O 3 materials were prepared with industrial waste residue as the raw material 12 . Those materials possessed a significantly lower thermal expansion coefficient than that of MgO, 13 therefore, they are an appropriate additive to improving the thermal shock resistance of LCMC. Compared to MA‐CA 6 material, LCMC with better properties were obtained when MA‐CA 2 material was added.…”

Section: Introductionmentioning

confidence: 99%

Improvement of low carbon MgO‐C refractories by MA‐CA₂ additives fabricated from metallurgical waste

Tang

et al. 2021

Int J Applied Ceramic Tech

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In the present work, MA-CA 2 material was fabricated by adding industrial alumina into industrial waste residue, and its effect on the physical properties, oxidation resistance, slag resistance, and thermal shock resistance when it was added to the composition of a low carbon MgO-C refractory was discussed in detail. Although the introduction of MA-CA 2 material led to a slight inferior slag corrosion resistance, the volume stability and oxidation resistance of refractories were improved. Moreover, the samples containing MA-CA 2 addition showed significantly lower thermal expansion coefficients and increased thermal shock resistance performance. However, owing to the dissolution of SiO 2 impurity into the MA-CA 2 material, an excessive addition of MA-CA 2 material would increase the liquid phase amount in the sample during the heat treatment and slag attack, resulting in a performance degradation. In this study, the best comprehensive performance of the MgO-C refractory was obtained with 6 wt% MA-CA 2 addition. K E Y W O R D Slow carbon MgO-C refractories, MA-CA 2 materials, slag corrosion, thermal shock resistance, waste industrial residue TANG eT Al.

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Effect of ZrO₂ Addition on Densification and Mechanical Properties of MgAl₂O₄–CaAl₄O₇–CaAl₁₂O₁₉ Composite

Cited by 27 publications

References 35 publications

Corrosion mechanism of reactive MgO‐bonded Cr₂O₃‐bearing castables in CaO–Al₂O₃–Fe₂O₃–SiO₂‐based steel‐making slag

Corrosion mechanism of reactive MgO‐bonded Cr₂O₃‐bearing castables in CaO–Al₂O₃–Fe₂O₃–SiO₂‐based steel‐making slag

Preparation of Zr⁴⁺ doped calcium hexaaluminate with improved slag penetration resistance

Improvement of low carbon MgO‐C refractories by MA‐CA₂ additives fabricated from metallurgical waste

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Effect of ZrO2 Addition on Densification and Mechanical Properties of MgAl2O4–CaAl4O7–CaAl12O19 Composite

Cited by 27 publications

References 35 publications

Corrosion mechanism of reactive MgO‐bonded Cr2O3‐bearing castables in CaO–Al2O3–Fe2O3–SiO2‐based steel‐making slag

Corrosion mechanism of reactive MgO‐bonded Cr2O3‐bearing castables in CaO–Al2O3–Fe2O3–SiO2‐based steel‐making slag

Preparation of Zr4+ doped calcium hexaaluminate with improved slag penetration resistance

Improvement of low carbon MgO‐C refractories by MA‐CA2 additives fabricated from metallurgical waste

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Product

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Effect of ZrO₂ Addition on Densification and Mechanical Properties of MgAl₂O₄–CaAl₄O₇–CaAl₁₂O₁₉ Composite

Corrosion mechanism of reactive MgO‐bonded Cr₂O₃‐bearing castables in CaO–Al₂O₃–Fe₂O₃–SiO₂‐based steel‐making slag

Corrosion mechanism of reactive MgO‐bonded Cr₂O₃‐bearing castables in CaO–Al₂O₃–Fe₂O₃–SiO₂‐based steel‐making slag

Preparation of Zr⁴⁺ doped calcium hexaaluminate with improved slag penetration resistance

Improvement of low carbon MgO‐C refractories by MA‐CA₂ additives fabricated from metallurgical waste