Effect of mullite phase formed in situ on pore structure and properties of high-purity mullite fibrous ceramics

Yuan, Lei; Liu, Zhenli; Yan, Zhengguo; Jin, Endong; Tian, Chen; Yu, Jingkun

doi:10.1016/j.ceramint.2021.10.136

Cited by 20 publications

(9 citation statements)

References 29 publications

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“…Figure 6B shows the thermal conductivities of 5RE 3 NbO 7 ‐900 fibrous ceramic and some typical thermal insulation materials. 5RE 3 NbO 7 ‐900 fibrous ceramic presented a lower thermal conductivity than mullite fibrous ceramics 21,45–47 and zirconia fibrous ceramics 48 with the same porosity (78.18 %, porosity), and closed to that of porous silica. Previous research suggested that porosity can reduce the effective heat carrying cross‐section, 18 slow down phonon velocity, and enhance effective phonon scatterings 49 .…”

Section: Resultsmentioning

confidence: 97%

Novel high entropy (Y_0.2Sm_0.2Gd_0.2Er_0.2Ho_0.2)₃NbO₇ nanofibers with ultralow thermal conductivity

Sun,

Huang

2023

J Am Ceram Soc.

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Thermal insulation materials can provide thermal protection in extreme environments. Ceramic fibers have played an important role in the thermal protection field at high temperatures due to the advantages of low density, high strength, low thermal conductivity, and excellent thermal stability. In this work, high entropy (Y0.2Sm0.2Gd0.2Er0.2Ho0.2)3NbO7 (5RE3NbO7) nanofibers were fabricated by electrospinning and subsequent calcination. Defective fluorite‐structured 5RE3NbO7 nanofibers were obtained when heated at 900°C. The research indicates that 5RE3NbO7 nanofiber based porous ceramics present an ultralow thermal conductivity (0.0992 W/m·K, porosity of 78.18%), good thermal stability, and high spectral reflectance, which establish the foundation for applications in thermal insulation.

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Section: Resultsmentioning

confidence: 97%

Novel high entropy (Y_0.2Sm_0.2Gd_0.2Er_0.2Ho_0.2)₃NbO₇ nanofibers with ultralow thermal conductivity

Sun,

Huang

2023

J Am Ceram Soc.

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“…However, in a high-temperature environment, the heat transfer of materials is mainly accomplished by thermal radiation. The wavelength of thermal radiation is mainly concentrated at 1–8 μm at high temperatures [ 31 ]; in this band, SiC NWS are able to effectively reduce the infrared transmittance, giving rise to the decrease in radiation thermal conduction. Moreover, after the in situ synthesis of SiC NWS, both the decline in pore size and the formation of hierarchical pore structures contributed to the decreasing collision frequency of gas molecules inside the pores of MF/SiC NWS, which is beneficial for restraining the thermal conduction of the gases [ 12 ].…”

Section: Resultsmentioning

confidence: 99%

“…Micro and nano fibers interlace together to form porous structure similar to traditional aerogels, but overcome the brittleness of traditional aerogel, which exhibits higher heat resistance and compressive strength. Among them, mullite-fiber-based aerogels have gained great interest owing to their excellent comprehensive properties (e.g., excellent heat and fire resistance, outstanding thermal shock resistance, and low thermal conductivity at room temperature) [ 31 , 32 , 33 ]. On the basis of this, many mullite-fiber-based aerogels have been reported.…”

Section: Introductionmentioning

confidence: 99%

Thermal Radiation Shielding and Mechanical Strengthening of Mullite Fiber/SiC Nanowire Aerogels Using In Situ Synthesized SiC Nanowires

Tong

et al. 2022

Materials

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Traditional solid nanoparticle aerogels have been unable to meet the requirements of practical application due to their inherent brittleness and poor infrared shielding performance. Herein, combining vacuum impregnation and high-temperature pyrolysis, a novel micro/nano-composite fibrous aerogel was prepared via in situ synthesis of silicon carbide nanowires (SiC NWS) in mullite fiber (MF) preform. During this process, uniformly distributed SiC NWS in the MF preform serve as an enhancement phase and also act as an infrared shielding agent to reduce radiation heat transfer, which can significantly improve the mechanical properties of the mullite fiber/silicon carbide nanowire composite aerogels (MF/SiC NWS). The fabricated MF/SiC NWS exhibited excellent thermal stability (1400 °C), high compressive strength (~0.47 MPa), and outstanding infrared shielding performance (infrared transmittance reduced by ~70%). These superior properties make them appealing for their potential in practical application as high-temperature thermal insulators.

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“…Compared to various synthesis methods, such as vacuum filtration, vacuum squeeze molding technique, sol–gel, aqueous gel-casting, and starch consolidation, the directional freeze-casting method as a facile approach to obtaining well-oriented porous channels has attracted much attention recently. The typical freeze-casting process includes casting and directional freezing of the liquid slurry, sublimation of the frozen solvent, and subsequent sintering .…”

Section: Introductionmentioning

confidence: 99%

Cuttlefish-Bone-Structure-like Lamellar Porous Fiber-Based Ceramics with Enhanced Mechanical Performances

Zhang

Guo

et al. 2023

ACS Appl. Mater. Interfaces

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Porous fiber-based ceramics have been widely applied in various fields because of their excellent thermal insulation property and high thermal stability property. However, designing porous fibrous ceramics with enhanced comprehensive performances, such as low density, low thermal conductivity, and high mechanical properties at both room temperature and high temperature, is still a challenge and the future development trend. Hence, based on the lightweight cuttlefish bone that possesses a “wall-septa” structure with excellent mechanical performance, we design and fabricate a novel porous fibrous ceramic with the unique fiber-based dual structure of lamellas by the directional freeze-casting method and systematically investigate the effects of lamellar components on the microstructure and mechanical performances of the product. For the desired cuttlefish-bone-structure-like lamellar porous fiber-based ceramics (CLPFCs), the porous framework formed by the overlapping of transversely arranged fibers helps to reduce the density and thermal conductivity of the product, and the longitudinally arranged lamellar structure replaces traditional binders and plays an important role in improving the mechanical properties in the direction parallel to the X–Z plane. Compared with traditional porous fibrous materials reported in the literature, the CLPFCs with an Al2O3/SiO2 molar ratio of 1:2 in the lamellar component exhibits prominent comprehensive performances, such as low density, excellent thermal insulation property, and outstanding mechanical performances at both room temperature and high temperature (3.46 MPa at 1300 °C), indicating that the CLPFCs are a promising candidate for applications in high-temperature thermal insulation systems.

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Effect of mullite phase formed in situ on pore structure and properties of high-purity mullite fibrous ceramics

Cited by 20 publications

References 29 publications

Novel high entropy (Y_0.2Sm_0.2Gd_0.2Er_0.2Ho_0.2)₃NbO₇ nanofibers with ultralow thermal conductivity

Novel high entropy (Y_0.2Sm_0.2Gd_0.2Er_0.2Ho_0.2)₃NbO₇ nanofibers with ultralow thermal conductivity

Thermal Radiation Shielding and Mechanical Strengthening of Mullite Fiber/SiC Nanowire Aerogels Using In Situ Synthesized SiC Nanowires

Cuttlefish-Bone-Structure-like Lamellar Porous Fiber-Based Ceramics with Enhanced Mechanical Performances

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Effect of mullite phase formed in situ on pore structure and properties of high-purity mullite fibrous ceramics

Cited by 20 publications

References 29 publications

Novel high entropy (Y0.2Sm0.2Gd0.2Er0.2Ho0.2)3NbO7 nanofibers with ultralow thermal conductivity

Novel high entropy (Y0.2Sm0.2Gd0.2Er0.2Ho0.2)3NbO7 nanofibers with ultralow thermal conductivity

Thermal Radiation Shielding and Mechanical Strengthening of Mullite Fiber/SiC Nanowire Aerogels Using In Situ Synthesized SiC Nanowires

Cuttlefish-Bone-Structure-like Lamellar Porous Fiber-Based Ceramics with Enhanced Mechanical Performances

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Product

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Novel high entropy (Y_0.2Sm_0.2Gd_0.2Er_0.2Ho_0.2)₃NbO₇ nanofibers with ultralow thermal conductivity

Novel high entropy (Y_0.2Sm_0.2Gd_0.2Er_0.2Ho_0.2)₃NbO₇ nanofibers with ultralow thermal conductivity