Phase equilibria study and thermodynamic description of the BaO‐CaO‐Al2O3 system

Zhang, Rui; Mao, Haiyang; Taskinen, Pekka

doi:10.1111/jace.14793

Cited by 7 publications

(5 citation statements)

References 14 publications

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“…4, indicate the presence of only CaAl2O4 and BaAl2O4. Thus, the results of our experimental studies on the existence of the ternary compound BaCaAl4O8 are in good agreement with our thermodynamic calculations and those of other authors [16,21] and prove the impossibility of its formation in the CaO-BaO-Al2O3 system, both from the melt and by solidphase synthesis. In our opinion, the formation of the BaCaAl4O8 compound in the aluminumbarium slag in [15] can be explained by its special composition (the presence of a small amount of SiO2, MgO, and F).…”

Section: Main Partsupporting

confidence: 92%

On the Existence of Ternary Compounds in the CaO-BaO-Al2O3 System

Shabanova,

Taranenkova,

Myrgorod

et al. 2023

MSF

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In this article in order to verify the probability of the formation of the compound CaBaAl4O8, a thermodynamic analysis of the following possible solid-phase reactions of its formation was carried out: formation of CaBaAl4O8 from the initial components - calcium carbon dioxide, barium carbon dioxide and aluminum oxide; the probability of formation of dual compounds CaAl2O4 and BaAl2O4 from the same raw materials (since the compound CaBaAl4O8 is located on the BaAl2O4-CaAl2O4 conjugate) and the possibility of formation of the compound CaBaAl4O8 from binary compounds CaAl2O4 and BaAl2O4. As a result of our experimental studies, the existence of ternary compounds Вa3CaAl2O7 and ВaCa2Al8O15 was confirmed, and it was found that the Вa3CaAl2O7 compound exists in the system at least up to a temperature of 1400 °C. Thus, our studies have determined an increase in the temperature limits of its existence, in contrast to the data of previous researchers, who indicated 1250 °C as the upper temperature of existence of Вa3CaAl2O7.

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Section: Main Partsupporting

confidence: 92%

On the Existence of Ternary Compounds in the CaO-BaO-Al2O3 System

Shabanova,

Taranenkova,

Myrgorod

et al. 2023

MSF

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“…In addition, the form of calcium aluminate can be changed by various cations, such as Na + , K + , Mg 2+ , Fe 3+ , and Si 4+ [40][41][42]. For example, the substitution of Ca 2+ with Sr 2+ or Ba 2+ [43,44]. Hence, ion doping can change the hydration properties while causing structural modifications of cementitious materials.…”

Section: Hydration Characteristics Of Cacmentioning

confidence: 99%

Review on recent advances in securing the long-term durability of calcium aluminate cement (CAC)-based systems

Kim

Son

Lee

2021

Funct. Compos. Struct.

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With growing demand for the development of multifunctional, high-performance, and high durable construction materials, numerous studies on calcium aluminate cement (CAC)-based cementitious materials having various desirable characteristics, such as heat and chemical resistance, have been widely conducted. CAC has monocalcium aluminate as the main clinker, provides fast hardening and short setting time, and is mainly used for self-leveling mortar and repair materials. Nevertheless, the phase transition of the main hydrates of CAC under high temperature and moisture conditions causes a strength loss at later age, and ultimately makes one to face difficulties securing long-term durability of CAC-based cementitious materials. This paper summarizes recent literatures in the area of hydration characteristics and mechanical properties of CAC-based materials. In addition, this paper covers various methods for suppressing the phase transition of CAC in literatures, and promotes the utilization of CAC as an advanced construction material with the possibility of securing long-term durability.

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“…The compound 12CaO . 7Al 2 O 3 (C12A7, Ca 12 Al 14 O 33 ) is formed near the eutectic composition in the CaO-Al 2 O 3 system in the temperature range between ~850 °C and the melting point of ~1410 °C [1] (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

“…The compound 12CaO·7Al 2 O 3 (C12A7, Ca 12 Al 14 O 33 ) is formed near the eutectic composition in the CaO–Al 2 O 3 system in the temperature range between ~850°C and the melting point of ~1410°C 1 (Figure 1). This rather rare circumstance makes it possible to synthesize this composition via the melt as a glass or glass frit.…”

Section: Introductionmentioning

confidence: 99%

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Electronic, mechanical, and thermal properties of [Ca₂₄Al₂₈O₆₄]⁴⁺(4e⁻) electride ceramic

Waetzig

Schilm

2021

Int J Ceramic Engine & Sci

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The compound [Ca 24 Al 28 O 64 ] 4+ (4e-) named as C12A7:e-has outstanding properties because of a low work function and high electron conductivity due to a cage like crystal structure. For the application of the material as hollow cathodes in small satellite propulsion systems, its preparation as sinterable glass ceramics via the powder route is purposeful. However, the mechanical and thermal properties of the C12A7:e-glass ceramics have only been insufficiently measured so far. In this study, the measured Vickers hardness (HV0.5) is 6.7 ± 0.2 GPa. The ceramic has a fracture toughness of 1.6 MPa m 0.5 (calculated by Shetty model) and a 4-pt.bending strength of σ = 75 ± 12 MPa (σ 0 = 90 MPa). The coefficient of thermal expansion CTE is between 4.2 and 6.0 × 10 -6 K -1 (RT-1000 °C) and the thermal conductivity ranges between 2.3 W m -1 K -1 (20 °C) and 1.7 W m -1 K -1 (1000 °C). For calculating the thermal conductivity, the heat capacity and the thermal diffusivity are measured.

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Phase equilibria study and thermodynamic description of the BaO‐CaO‐Al₂O₃ system

Cited by 7 publications

References 14 publications

On the Existence of Ternary Compounds in the CaO-BaO-Al<sub>2</sub>O<sub>3</sub> System

On the Existence of Ternary Compounds in the CaO-BaO-Al<sub>2</sub>O<sub>3</sub> System

Review on recent advances in securing the long-term durability of calcium aluminate cement (CAC)-based systems

Electronic, mechanical, and thermal properties of [Ca₂₄Al₂₈O₆₄]⁴⁺(4e⁻) electride ceramic

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Phase equilibria study and thermodynamic description of the BaO‐CaO‐Al2O3 system

Cited by 7 publications

References 14 publications

On the Existence of Ternary Compounds in the CaO-BaO-Al<sub>2</sub>O<sub>3</sub> System

On the Existence of Ternary Compounds in the CaO-BaO-Al<sub>2</sub>O<sub>3</sub> System

Review on recent advances in securing the long-term durability of calcium aluminate cement (CAC)-based systems

Electronic, mechanical, and thermal properties of [Ca24Al28O64]4+(4e−) electride ceramic

Contact Info

Product

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About

Phase equilibria study and thermodynamic description of the BaO‐CaO‐Al₂O₃ system

Electronic, mechanical, and thermal properties of [Ca₂₄Al₂₈O₆₄]⁴⁺(4e⁻) electride ceramic