High-strength thermal insulating mullite nanofibrous porous ceramics

Electrospun polymer nanocomposites for thermal management: a review

“…To improve the strength of nanofibrous porous ceramics with high-temperature thermal insulation, Zhang et al proposed and implemented a strategy of replacing mullite microfibers with nanofibers. 57 The results were satisfactory, considering that the strength of the modified porous ceramics was 62.5% higher than that of the previous ones, while the density was only 75.9%. For destroying the heat conduction paths to reduce solid heat transfer, Zhang et al 58 embedded hollow TiO 2 spheres into the fibers through e-spinning technology.…”

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

“…While using Al 2 O 3 as the binder, porous fibrous ceramics possess a relatively high compressive strength (2.78–3.40 MPa) and the highest bulk density (0.69–1.17 g·cm –3 ) simultaneously, whereas the bulk density also significantly increases. Hence, compared to porous fibrous ceramics bonded with different binders, − the synthesized CLPFCs bonded with mullite-SiO 2 possess a unique integration of low bulk density (0.48 g·cm –3 ) and excellent compressive strength (4.54 MPa). Furthermore, high-temperature compressive strength tests of porous fibrous ceramics are still lacking in most of the previously published studies, whereas the high-temperature compressive strength of CLPFCs in this work is investigated and has been enhanced up to 3.45 MPa at 1300 °C as illustrated in Figure .…”

“…On the other hand, the lamellas of the CLPFCs actually should be regarded as the binder with a specific structure that has significant influences on the microstructure and mechanical properties of the porous fibrous ceramic. Among diverse binders that have been utilized to fabricate porous fibrous ceramics, SiO 2 is one of the most common high-temperature binders and has been widely applied in porous fibrous ceramics. , The introduction of other binders like B 2 O 3 , and Al 2 O 3 ,, has been confirmed to be beneficial to reinforcing the porous fibrous ceramics. However, the low melting point of SiO 2 and B 2 O 3 tremendously limits their tolerance capacity and service life in the extremely high temperature environment.…”

Microstructure and properties of porous ceramics synthesized using Kubuqi desert sand

“…In the solid-phase transfer, the heat transfer rate and direction will change when the heat touches the pore. Because the thermal conductivity rate of the gas phase is slower than that of the solid-phase, the movement of the gas molecules in the small pores or closed pores is limited and the thermal conductivity is reduced, while the interconnected open pores can make the heat flow through directly, and the reduction of the thermal conductivity of the ceramic is not as large as the closed pores [22,23]. Finally, porous ceramics with a low solid-phase ratio and a high proportion of closed pores have lower thermal conductivity.…”