Design of thermal insulation based on Open-Cell carbon materials for spacecraft

Prosuntsov, P. V.; Praheeva, Anna

doi:10.1016/j.matpr.2020.10.032

Cited by 4 publications

(2 citation statements)

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“…Materials with maximum porosity and minimum pore size are considered the most promising for achieving low effective thermal conductivity. 1 Aerogels possess unique characteristics such as fine skeleton particles, nanoscale pore sizes, and porosities exceeding 90%. Therefore, their thermal conductivity can be as low as 0.01− 0.03 W/(m K), making them the world's lowest thermal conductivity solid materials.…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, the development of new insulation materials has become a primary focus in this field. Materials with maximum porosity and minimum pore size are considered the most promising for achieving low effective thermal conductivity . Aerogels possess unique characteristics such as fine skeleton particles, nanoscale pore sizes, and porosities exceeding 90%.…”

Section: Introductionmentioning

confidence: 99%

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SiZrOC Aerogels with Low Thermal Conductivity and Enhanced Thermal Stability for Applications in High-Temperature Nanoscale Thermal Insulators

Han,

Wu,

Huang

et al. 2023

ACS Appl. Nano Mater.

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The continuous, random three-dimensional nanostructure of aerogels is the key determinant of their exceptional thermal insulating performance. However, at elevated temperatures, sintering can lead to disruption of this nanostructure. SiOC and SiZrOC aerogels were prepared by pyrolyzing organic–inorganic precursor aerogels at 1000 °C under an Ar atmosphere. The pyrolysis treatment resulted in the formation of a Si–O–C structure with excellent thermal stability. Following calcination at 1000 °C for 0.5 h, SiZrOC demonstrated a specific surface area retention rate of 76.8% and a pore volume retention rate of 75.8%, surpassing the most advanced ZrO2–SiO2 aerogel. Additionally, SiZrOC consistently exhibited outstanding thermal insulation performance, with thermal conductivities of 0.0273 and 0.0332 W m–1 K–1 before and after calcination at 1000 °C, respectively. Notably, it was observed for the first time that the rearrangement of Si–C and Si–O bonds caused by pyrolysis induced a loosening effect on the SiO4 structure within the aerogel. Consequently, during subsequent aerobic calcination, SiOC and SiZrOC underwent another phase separation stage, resulting in a further increase in the number of Si–O–C structures, which offers an approach to improve thermal insulation properties in extreme environments. The superior thermal stability and thermal insulation performance make SiZrOC a promising candidate for applications in high-temperature nanoscale thermal insulation materials.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%