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Recently, the thermal structure composite material team of the Institute of Metal Research, Chinese Academy of Sciences used high-pressure assisted curing-atmospheric pressure drying technology to prepare ultra-high temperature resistant thermal insulation through matrix microstructure control, fiber-matrix synergistic shrinkage, and in-situ interface reaction.
- Bearing integrated lightweight carbon matrix composites
.
Carbon aerogels (CAs) are expected to be a breakthrough solution for the design of a new generation of advanced ultra-high temperature lightweight thermal protection systems due to their excellent thermal stability and thermal insulation
.
In recent years, the research team has successively developed two CAs preparation technologies: sol-gel-water-phase atmospheric drying, high-pressure assisted curing-atmospheric-pressure drying, and designed an ultra-low density carbon-organic hybrid fiber reinforcement, which endows it with excellent properties.
Super elastic
.
The material enables efficient and low-cost fabrication and exhibits properties such as low density, low thermal conductivity, and high compressive strength
.
On this basis, the team used industrial phenolic resins as precursors, high-boiling alcohols as pore-forming agents, and high-pressure curing to improve the intrinsic strength of the framework.
Good phenolic fibers are used as reinforcements, and through the in-situ reaction at the fiber/matrix interface, the synergistic shrinkage of the matrix and the fiber and the strong chemical bonding of the fiber/matrix interface during the carbonization process are realized, and finally a large-size, crack-free carbon fiber reinforced type is obtained.
CAs composites
.
The material has a density of 0.
6 g/cm3, its compressive strength and in-plane shear strength can reach 80 MPa and 20 MPa, respectively, and its thermal conductivity is only 0.
32 W/m K.
Its specific compressive strength is higher than known Aerogel materials and carbon foams reported in the literature
.
The material also has higher mechanical strength and exhibits excellent ultra-high temperature resistance, thermal insulation and load-bearing properties
.
The above-mentioned thermal insulation-load-bearing integrated lightweight carbon-based composite materials have been installed and used in many advanced engines as rigid thermal insulation materials, providing key technical support for model development
.