Phase formation and microstructure evolution in mullite ceramics synthesized from mechanochemically activated oxide powders doped with Cr2O3

Xiao, Zhuohao; Li, Xianglin; Sun, Xin‐Yuan; Yu, Shijin; Jiang, Yi; Li, Xiuying; Jiang, Hong; Luo, Wenyan; Wang, Chuanhu; Li, Sean; Kong, Ling Bing

doi:10.1016/j.jpcs.2018.08.003

Cited by 7 publications

(9 citation statements)

References 46 publications

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“…Mullite possesses outstanding properties, such as high melting point, low thermal expansion coefficient, high‐temperature resistance, strong creep, and thermal shock resistance 12 . As a result, it is widely used to fabricate oxide/oxide ceramic composites 13–16 . Moreover, using cheap coal gangue instead of pure raw materials in the synthesis of mullite allows one to solve the problems associated with environmental pollution, reduce the costs, and realize its value‐added utilization.…”

Section: Introductionmentioning

confidence: 99%

“…12 As a result, it is widely used to fabricate oxide/oxide ceramic composites. [13][14][15][16] Moreover, using cheap coal gangue instead of pure raw materials in the synthesis of mullite allows one to solve the problems associated with environmental pollution, reduce the costs, and realize its value-added utilization. In this respect, resource utilization of coal gangue has attracted increased attention over the past years.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical properties of in situ synthesized mullite‐based composite ceramics with three‐dimensional network structure

Liu

Xie

et al. 2022

Int J Applied Ceramic Tech

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Needle-like nanocrystalline mullite powders were prepared through the molten salt process at the temperature of 900 • C using coal gangue as raw material. Then, mullite-based composite ceramics were prepared by a conventional solid-state reaction between in situ synthesized mullite and Al 2 O 3 powders. Effects of Al 2 O 3 content and sintering temperatures on phase compositions, microstructure, and mechanical properties of the mullite-based composite ceramics were also studied. The results show that mullite content productivity increase from 72% to 95%, as the sintering temperature increased from 1480 • C to 1580 • C, which led to the improvement in the bulk density and flexural strength of the samples. The three-dimensional interlocking structure for mullite-based composite ceramics was obtained by the in situ solid-state reaction process. The maximum bulk density, flexural strength, and fracture toughness for the sample with 15 wt% Al 2 O 3 content are 2.48 g/cm 3 , 139.79 MPa, and 5.62 MPa⋅⋅m 1/2 , respectively, as it was sintered at the temperature of 1560 • C for 3 h. The improved mechanical properties of mullite-based composite ceramics maybe ascribed to good densification and increased mullite phase content, as well as to the in situ three-dimensional network structure. Therefore, the results would provide new ideas for high-value utilization of coal gangue.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanical properties of in situ synthesized mullite‐based composite ceramics with three‐dimensional network structure

Liu

Xie

et al. 2022

Int J Applied Ceramic Tech

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“…As demonstrated in the open literatures 31–33 of transitional metal oxides, such as CeO 2 , WO 3, and Fe 2 O 3, they have been studied in terms of their effects on phase formation and microstructural development of mullite ceramics. For instance, the doping of CeO 2 resulted in anisotropic grain growth of mullite ceramics 31,34 . The presence of WO 3 accelerated the phase formation of mullite due to the generation of the liquid phase at high temperatures 3,35,36 .…”

Section: Introductionmentioning

confidence: 99%

“…For instance, the doping of CeO 2 resulted in anisotropic grain growth of mullite ceramics. 31,34 The presence of WO 3 accelerated the phase formation of mullite due to the generation of the liquid phase at high temperatures. 3,35,36 Svetlana et al 37 found that, with increasing temperature, solid solubility of Fe 2 O 3 in mullite was gradually increased, and solubility of up to 7.6 wt% at 1300°C.…”

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confidence: 99%

Phase formation, microstructure development, and mechanical properties of kaolin‐based mullite ceramics added with Fe₂O₃

Zhenying

Lian

Liu

et al. 2021

Int J Applied Ceramic Tech

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Mullite is an excellent ceramic material due to the unique properties, such as low coefficient of thermal expansion, high corrosion resistance to acid and alkali, high-temperature creep resistance, strong thermal shock resistance, high chemical and thermal stability, high permeability, and excellent mechanical properties. [1][2][3] Mullite ceramics have been widely utilized as metallurgical, glass, ceramic, and other industrial refractory materials. [4][5][6] They are also widely used as heatresistant materials, such as crucibles, protective tubes, and thermocouple tubes for electronic packaging. [7][8][9] Other applications include window materials under harsh chemical conditions and mechanical stress at high temperatures. [10][11][12] Mullite has been synthesized using various methods, such as sol-gel process, chemical syntheses, 13,14 co-precipitation, 6,15 hydrothermal reaction, 16,17 flash combustion, [18][19] and chemical vapor deposition. 20,21 However,

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“…Additives can also influence the morphology, microstructure, and composition of the grains [4,14]. Many studies have been developed on the effect of additives such as MgO [2,4,7,8,[15][16][17][18][19], TiO 2 [20], B 2 O 3 [21], CeO 2 [22], Cr 2 O 3 [23], La 2 O 3 [7], and Y 2 O 3 [2,10,15], on the mullitization temperature, as well as the mullite characteristics and properties after sintering [2-4, 6, 7].…”

Section: Introductionmentioning

confidence: 99%

Effect of MgO addition on the sinterability and mechanical properties of mullite ceramics

Olcoski

Chinelatto

2021

Cerâmica

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Mullite is a refractory material with singular properties, although high temperatures and long sintering times are required to obtain this material with good densification. In this study, aluminum hydroxide and colloidal silica were used to produce mullite through reactive sintering and MgO was employed as a sintering additive. The compositions were prepared with different amounts of MgO and sintered at 1350, 1450, and 1550 °C, and then analyzed using X-ray diffraction, scanning electron microscopy, and measurements of apparent porosity (AP) and flexural strength. The results showed that the raw materials used allowed the mullite formation at relatively low temperatures (1350 °C), regardless of the amount of MgO added but with the increase in MgO content, a spinel phase appeared, resulting in a fraction of residual α-alumina. The MgO addition lowered the densification temperature at around 50 °C. Furthermore, the higher the sintering temperature and the MgO content, the larger and more anisotropic the mullite grains were. At sintering temperatures above 1450 °C, AP was reduced to approximately 10%. The MgO addition and increase in sintering temperature improved the flexural strength of mullite materials.

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Phase formation and microstructure evolution in mullite ceramics synthesized from mechanochemically activated oxide powders doped with Cr2O3

Cited by 7 publications

References 46 publications

Mechanical properties of in situ synthesized mullite‐based composite ceramics with three‐dimensional network structure

Mechanical properties of in situ synthesized mullite‐based composite ceramics with three‐dimensional network structure

Phase formation, microstructure development, and mechanical properties of kaolin‐based mullite ceramics added with Fe₂O₃

Effect of MgO addition on the sinterability and mechanical properties of mullite ceramics

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Phase formation and microstructure evolution in mullite ceramics synthesized from mechanochemically activated oxide powders doped with Cr2O3

Cited by 7 publications

References 46 publications

Mechanical properties of in situ synthesized mullite‐based composite ceramics with three‐dimensional network structure

Mechanical properties of in situ synthesized mullite‐based composite ceramics with three‐dimensional network structure

Phase formation, microstructure development, and mechanical properties of kaolin‐based mullite ceramics added with Fe2O3

Effect of MgO addition on the sinterability and mechanical properties of mullite ceramics

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Phase formation, microstructure development, and mechanical properties of kaolin‐based mullite ceramics added with Fe₂O₃