Synthesis of CaO·2MgO·8Al2O3 (CM2A8) and its slag resistance mechanism

Chen, Junhong; Chen, Haiyang; Mi, Wenjun; Cao, Zheng; Li, Bin; Li, Guangqi

doi:10.1016/j.jeurceramsoc.2016.11.018

Cited by 15 publications

(9 citation statements)

References 21 publications

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“…Both CA 6 and MA are excellent refractories which play important roles in many high temperature applications, so it can be deduced that CM 2 A 8 and C 2 M 2 A 14 are also remarkable refractories which integrate the merits of MA and CA 6 . In addition to the higher melting points of CM 2 A 8 (1820±10 ℃) and C 2 M 2 A 14 (1830±10 ℃) [26], outstanding corrosion resistance was proved by the slag resistance test in our previous work [27]. Besides that, CM 2 A 8 and C 2 M 2 A 14 can also remove the inclusions in molten steel and purify molten steel, which is due to the M units in their stacking structure.…”

Section: Introductionmentioning

confidence: 77%

“…Göbbels et al [23][24][25][26] found two ternary compounds in the Al-rich part of CaO-Al 2 O 3 -MgO system: CaMg 2 Al 16 O 27 and Ca 2 Mg 2 Al 28 O 46 (abbreviated as CM 2 A 8 and C 2 M 2 A 14 in the following), which have magnetoplumbite related structures composed of two kinds of structure units, namely M (CaAl 12 O 19 , magnetoplumbite unit) and S (MgAl 2 O 4 , spinel unit). They also confirmed that the stacking sequences are (MS) n and (M 2 S) n for CM 2 A 8 and C 2 M 2 A 14 , respectively.…”

Section: Introductionmentioning

confidence: 99%

“…In both cases, Mg 2+ enters CA 6 lattice, rather than causing the structural alteration, but it is stored in CA 6 lattice in the form of magnesium aluminate spinel [25,26]. During the synthesis of CM 2 A 8 and C 2 M 2 A 14 , CA 6 and MA formed initially and then the solid solution reaction occurred between CA 6 and MA to form CM 2 A 8 or C 2 M 2 A 14 [27]. From the aspect of stacking structure and preparation process, it can be concluded that CM 2 A 8 and C 2 M 2 A 14 are the composite reaction products of CA 6 and MA at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

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Physical and mechanical properties of hot-press sintering ternary CM2A8 (CaMg2Al16O27) and C2M2A14 (Ca2Mg2Al28O46) ceramics

Guangqi²,

Chen

et al. 2018

J Adv Ceram

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The new ternary CM 2 A 8 (CaMg 2 Al 16 O 27 ) and C 2 M 2 A 14 (Ca 2 Mg 2 Al 28 O 46 ) pure and dense ceramics were first prepared by a hot-press sintering technique, and their physical and mechanical properties were investigated. The purity of obtained CM 2 A 8 and C 2 M 2 A 14 ceramics reaches 98.1 wt% and 97.5 wt%, respectively. Their microstructure is dense with few observable pores, and their grain size is about a few dozen microns. For their physical properties, the average apparent porosity of CM 2 A 8 and C 2 M 2 A 14 ceramics is 0.18% and 0.13%, and their average bulk density is 3.66 g/cm 3 and 3.71 g/cm 3 , respectively. The relative density of CM 2 A 8 ceramic is 98.12% and that of C 2 M 2 A 14 ceramic is 98.67%. The thermal expansivity (50-1400 ℃) of CM 2 A 8 and C 2 M 2 A 14 ceramics is 9.24×10 -6 K -1 and 8.92×10 -6 K -1 , respectively. The thermal conductivity of CM 2 A 8 and C 2 M 2 A 14 ceramic is 21.32 W/(m·K) and 23.25 W/(m·K) at 25 ℃ and 18.76 W/(m·K) and 19.42 W/(m·K) as temperature rises to 350 ℃, respectively. In addition, the mechanical properties are also achieved. For CM 2 A 8 ceramic, the flexural strength is 248 MPa, the fracture toughness is 2.17 MPa·m 1/2 , and the Vickers hardness is 12.26 GPa. For C 2 M 2 A 14 ceramic, the flexural strength is 262 MPa, the fracture toughness is 2.23 MPa·m 1/2 , and the Vickers hardness is 12.95 GPa.

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Section: Introductionmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Physical and mechanical properties of hot-press sintering ternary CM2A8 (CaMg2Al16O27) and C2M2A14 (Ca2Mg2Al28O46) ceramics

Guangqi²,

Chen

et al. 2018

J Adv Ceram

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“…The viscosity of alkali slag usually increases with the content of SiO 2 , thus the enrichment of SiO 2 in slag can effectively inhibit the penetration. At the interface between corrosion layer and substrate layer (Figure 14E), the formation of a continuous dense CA 2 layer can be observed, which can also hinder the further corrosion and penetration of slag to the substrate 33–36 …”

Section: Resultsmentioning

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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“…As promising refractories, C 2 M 2 A 14 and CM 2 A 8 are potential substitutes for ladles lining in steel industry, so it is also necessary to investigate their slag resistance. In our previous works, CM 2 A 8 has been synthesized and its slag resistance was discussed . In this work, C 2 M 2 A 14 was synthesized with analytically pure Al 2 O 3 , CaO, and MgO as raw materials and its growth mechanism and slag resistance were investigated.…”

Section: Introductionmentioning

confidence: 99%

Preparation, growth mechanism and slag resistance behavior of ternary Ca₂Mg₂Al₂₈O₄₆ (C₂M₂A₁₄)

Bin

Chen

et al. 2019

Int J Applied Ceramic Tech

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The ternary phase Ca2Mg2Al28O46 (C2M2A14) in the CaO‐Al2O3‐MgO system was synthesized by reaction sintering using analytically pure CaO, MgO and Al2O3 as raw materials. The solid‐solution reaction between CaAl12O19 (CA6) and MgAl2O4 (MA) takes place at 1650°C and hexagonal thick flake C2M2A14 are produced at 1750°C. Due to the substitution of Al3+ for Mg2+ in the spinel unit of C2M2A14, C2M2A14, CM2A8 and CA2 appear in the product batched with stoichiometric ratio. When the firing temperature is 1750°C and the solid soluble amount of Al3+ is 0.2, C2M2A14 with high purity of 96.5 wt % is obtained. As for the growth mechanism, it follows a two‐dimensional nucleation theory, i.e., MA forms two‐dimensional nuclei on the (0001) plane of CA6 and provide growth steps for atomic deposition. When the temperature reaches a certain point, MA's crystallization interface obtains great growth driving force and MA on the layer begins to merge with the CA6 matrix to form hexagonal thick flake C2M2A14. During the slag corrosion, the formation of dense coating layer with CA2 as the main component improve the high temperature stability and corrosion resistance. Therefore, C2M2A14 is of great potentiality to be applied in the ladle lining.

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Synthesis of CaO·2MgO·8Al2O3 (CM2A8) and its slag resistance mechanism

Cited by 15 publications

References 21 publications

Physical and mechanical properties of hot-press sintering ternary CM2A8 (CaMg2Al16O27) and C2M2A14 (Ca2Mg2Al28O46) ceramics

Physical and mechanical properties of hot-press sintering ternary CM2A8 (CaMg2Al16O27) and C2M2A14 (Ca2Mg2Al28O46) ceramics

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

Preparation, growth mechanism and slag resistance behavior of ternary Ca₂Mg₂Al₂₈O₄₆ (C₂M₂A₁₄)

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Synthesis of CaO·2MgO·8Al2O3 (CM2A8) and its slag resistance mechanism

Cited by 15 publications

References 21 publications

Physical and mechanical properties of hot-press sintering ternary CM2A8 (CaMg2Al16O27) and C2M2A14 (Ca2Mg2Al28O46) ceramics

Physical and mechanical properties of hot-press sintering ternary CM2A8 (CaMg2Al16O27) and C2M2A14 (Ca2Mg2Al28O46) ceramics

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

Preparation, growth mechanism and slag resistance behavior of ternary Ca2Mg2Al28O46 (C2M2A14)

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Product

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

Preparation, growth mechanism and slag resistance behavior of ternary Ca₂Mg₂Al₂₈O₄₆ (C₂M₂A₁₄)