Effect of incorporation of nitrogen on calcium hexaaluminate

Xu, Linchao; Wang, Enhui; Hou, Xinmei; Chen, Junhong; He, Zhi; Liang, Tongxiang

doi:10.1016/j.jeurceramsoc.2020.06.057

Cited by 44 publications

(12 citation statements)

References 26 publications

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“…The changing trend of c / a coincides well with the DFT calculation results. At the same time, the results show that Zr 4+ doping is more effective than N 3− doping in increasing the grain thickness (the lattice parameters of N 3− doping CA 6 are 5.561 Å in a and 21.904 Å in c, where c / a = 3.939 18 ).…”

Section: Resultsmentioning

confidence: 83%

“…It is well known that ions doping is an effective method to increase the density of CA 6 by regulation of the crystal growth habit 16–18 . For instance, Liu et al 17 introduced Al vacancies into CA 6 by replacing Al 3+ with Ti 4+ , which promoted the growth of CA 6 crystals along c ‐axis.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, Liu et al 17 introduced Al vacancies into CA 6 by replacing Al 3+ with Ti 4+ , which promoted the growth of CA 6 crystals along c ‐axis. Xu et al 18 incorporated N into CA 6 to replace the Al‐O bond with a longer tetrahedral Al‐N bond, thereby increasing the crystal thickness of CA 6 along the c ‐axis. It is well known that zirconium oxides exhibit good mechanical properties and excellent corrosion resistance against steel/slag systems 19,20 .…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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“…Calcium hexaaluminate (CaAl 12 O 19 , usually denoted as CA 6 ) is of great interest as high temperature ceramics bene ting from the combination of excellent properties including high melting point, good alkaline resistance, high stability in a reducing atmosphere, and low thermal conductivity, and so on [1][2][3][4]. However, CA 6 possesses a magnetoplumbite structure and belongs to hexagonal crystal system (space group P63/mmc) [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of CA6/AlON Composites with Enhanced Slag Resistance

Liu

Wang

et al. 2021

Preprint

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Aiming to improve the slag resistance of calcium hexaaluminate (CA6), different amounts of AlON have been introduced into CA6 using two approaches, i.e. one-step and two-step methods. The results show that both the two phases of CA6 and AlON are uniformly distributed when sintered at 1650 °C for 2 h in flowing nitrogen using two-step method. The optimized amount of AlON addition is determined to be 10 wt%. In addition, the reaction test method is performed and CA6/AlON composite exhibits much better slag penetration and corrosion resistance compared with pure CA6. The effect of AlON is also discussed.

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“…However, as per the survey of existing literature, no research has reported the effect of Sr 2+ substitution on the physicomechanical properties of the CA 6 ceramics, synthesized by sol-gel auto combustion (SGC) method. L.Xu et al [16] proposed nitrogen substitution for oxygen in CA 6 for enhanced densification.…”

Section: Introductionmentioning

confidence: 99%

Development of dense Sr-substituted CaAl₁₂O₁₉ (CA₆) ceramics synthesized by sol-gel combustion method

Hossain

Jani

Roy

et al. 2021

Journal of Asian Ceramic Societies

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The most alumina-rich compound in the CaO-Al 2 O 3 system is calcium hexaaluminate (CaAl 12 O 19 , CA 6 ). CA 6 ceramics were synthesized by the sol-gel auto combustion method. CA 6 phase formation has been achieved at 1200°C, which is a much lower temperature than the convention process (>1600°C). The influence of Sr 2+ substitution on the densification of Ca 1-x Sr x Al 12 O 19 (x = 0, 0.1, 0.2, and 0.3) ceramics was investigated. The X-ray diffraction analysis and structural refinement indicated the substitution of Sr 2+ ions into the lattice of CA 6 . The elongation of the "c" direction of the CA 6 crystal structure was found with Sr 2+ ion substitution. Surface morphology analysis showed a crystal growth with Sr 2+ substitution in CA 6 upto x = 0.2 composition. The 1600°C sintered specimen (with x = 0.2 composition) showed the bulk density and open porosity of 3.39 g/cm 3 and 4.92%, respectively. Thus, auto combustion synthesis and Sr 2+ substitution into CA 6 ceramics are feasible and beneficial for the densification of the ceramics.

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Effect of incorporation of nitrogen on calcium hexaaluminate

Cited by 44 publications

References 26 publications

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

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

Synthesis of CA6/AlON Composites with Enhanced Slag Resistance

Development of dense Sr-substituted CaAl₁₂O₁₉ (CA₆) ceramics synthesized by sol-gel combustion method

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Effect of incorporation of nitrogen on calcium hexaaluminate

Cited by 44 publications

References 26 publications

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

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

Synthesis of CA6/AlON Composites with Enhanced Slag Resistance

Development of dense Sr-substituted CaAl12O19 (CA6) ceramics synthesized by sol-gel combustion method

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Product

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

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

Development of dense Sr-substituted CaAl₁₂O₁₉ (CA₆) ceramics synthesized by sol-gel combustion method