Foamy carbon based heat-insulation composite material with light weight and high strength

Abstract

The invention provides a foamy carbon based heat-insulation composite material with light weight and high strength. The foamy carbon based heat-insulation composite material with light weight and high strength is characterized by comprising a base material foamy carbon, an SiC coating and reticulated SiC nanowires, wherein a foamy carbon skeleton is coated with the SiC coating; three-dimensional pores are filled with the reticulated SiC nanowires, porosity is 90%-95%, average pore diameter is 50 nm-500 nm, apparent density is 0.05-0.2 g / cm<3>, and compressive strength is 5-15 MPa. Foamy carbon is flexible foamy carbon and is prepared from melamine foam through high-temperature pyrolysis, the porosity is 99% or higher, and the average pore diameter is 20-50 mu m; the thickness of the SiC coating is 0.5-1 mu m, the diameter of the SiC nanowires is 50-300 nm, the average length is 30-50 mu m, and all the SiC nanowires are prepared with a chemical vapor deposition method. The light foamy carbon based heat-insulation composite material with high strength has the advantages as follows: 1, the foamy carbon skeleton is coated with SiC, so that oxidation resistance of the composite material is improved; 2, the foamy carbon skeleton is coated with SiC, and mechanical properties of the composite material are improved accordingly; 3, internal pores of foam are segmented by the SiC nanowires, the internal pore diameter is reduced, and the heat conductivity of the composite material is reduced.

Description

technical field [0001] The invention relates to a foamed carbon-based heat-insulating composite material, in particular to a lightweight and high-strength foamed carbon-based heat-insulated composite material. Background technique [0002] With the development of space vehicles and missiles, new hypersonic vehicles will suffer severe aerodynamic heating during long-duration cruise or re-entry in dense atmosphere. In order to prevent thermal damage to internal structures and instruments caused by aerodynamic heating during long-term flight of high-speed aircraft, this type of aircraft requires a high-temperature resistant, efficient, and lightweight thermal protection system. However, the use temperature of existing organic heat insulation materials is not high, and the heat insulation effect of inorganic fiber heat insulation materials used for high temperature heat insulation is limited by the production process and it is difficult to further improve, especially in high tem...

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Problems solved by technology

However, the SiC coating material obtained by this preparation method has a loose structure and poor compactness, and the temperature tolerance and mechanical properties of carbon foams in an aerobic environment are limited.

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