High-temperature resistant Y2SiO5–TiO2 aerogel composite for efficient thermal insulation

Lightweight, flexible, and heat‐insulated phenolic impregnated carbon ablator (PICA) with adjustable flexibility and high compressive resilience property

“…The behavior of compression rebound at high temperature was investigated through exposing the sample to the fire of an alcohol lamp and compressed by tweezers and then released. The property of thermal insulation at high temperature was measured through a back‐face temperature test on hot‐face at 1000°C using the same method as reported in our previous works 22–24 . In brief, the samples of flexible PICA with a diameter of 50 mm and a thickness of 10 mm were placed into an insulation brick with a thickness of 20 mm of the muffle furnace and the hot‐face was heated to 1000°C.…”

An Unusual Carbon–Ceramic Composite with Gradients in Composition and Porosity Delivering Outstanding Thermal Protection Performance up to 1900 °C

“…Figure 6 compares specific strength versus working temperatures of the composite-G and other traditional porous materials that may be used in oxidizing environments for aerospace vehicles. The composite-G has a significant improvement in specific strength compared with oxide aerogels [4,28] or their composites, [7][8][9]29] coated CBCF composites, [30] and rigid insulation tiles. [2,3] For example, compared with the rigid insulation tiles most widely used as ablation resistant and heat insulation materials, the composite-G has a 12-34 times higher specific strength of 119 MPa g -1 cm 3 .…”

“…Figure 6. Specific compressive strengths versus working temperature for the composite-G and traditional porous materials for possible use in oxidizing environments for aerospace vehicles [2][3][4][7][8][9][28][29][30] specimen surface was exposed to an oxyacetylene torch and a metal sheet was attached to its back. Schematics of the test and demonstration as well as detailed parameters of the ablation process are shown in Figure S7 and Table S1 (Supporting Information), respectively.…”

“…However, their use is limited by their poor mechanical properties and low operating temperatures, for example, the usable temperature limits for these aerogels are as follows: SiO 2 (650 °C), [4] ZrO 2 (800 °C), [5] Al 2 O 3 (1000 °C), [6] mullite-ZrO 2 /Al 2 O 3 -SiO 2 (1000 °C), [7] quartz/Al 2 O 3 -SiO 2 (1100 °C), [8] and mullite/Y 2 SiO 5 (1200 °C). [9] Carbon-based materials have an extremely high thermostability, even up to 3000 °C, which makes them promising as lightweight aerospace TPMs. Among them, carbon-bonded carbon fiber (CBCF) composites, consisting of chopped carbon fibers bonded by pyrolytic carbon, are important for use as thermal insulators in re-entry bodies.…”

“…Among them, carbon‐bonded carbon fiber (CBCF) composites, consisting of chopped carbon fibers bonded by pyrolytic carbon, are important for use as thermal insulators in re‐entry bodies. [ 10 ] They usually have a high porosity and, as a consequence, poor mechanical properties; and the high crystallinity of the fibers and pyrolytic carbon usually results in a relatively high thermal conductivity. Carbon aerogels (CAs) with an overlapping nanoparticle network and abundant mesopores are considered one of the most promising candidates for thermal‐insulation at ultra‐high temperatures.…”