A kind of high thermal conductivity graphite foam/carbon composite material and preparation method thereof

Abstract

The invention relates to a high thermal conductivity graphite foam / carbon composite material and a preparation method thereof. Firstly, mesophase pitch is used as a precursor to prepare graphite foam with high thermal conductivity as a reinforcing base; and then mesophase pitch or coal pitch is used as the matrix carbon precursor. The graphite foam reinforced base is densified through medium and high pressure impregnation / carbonization technology; finally, the obtained material is subjected to high-temperature graphitization treatment above 2500°C, resulting in a density above 1.3g / cm3 and a thermal conductivity greater than 300W / m· K, the compressive strength of high thermal conductive graphite foam / carbon composite materials can reach more than 9MPa. Its thermal conductivity and compressive strength are more than 2 times and 3 times that of graphite foam materials. Compared with high thermal conductive carbon / carbon composite materials, the preparation cost and The cycle is also greatly compressed.

Description

technical field [0001] The invention relates to a high thermal conductivity graphite foam / carbon composite material and a preparation method thereof, belonging to the technical field of high thermal conductivity carbon-based composite material manufacturing. Background technique [0002] With the rapid development of science and technology, thermal management and heat dissipation have become key technologies for the development of many fields. Various aerospace vehicles (aircraft, missiles, satellites and various spacecraft) require precise electronic equipment control systems to achieve automation and precise control and guidance of aerospace weapons. These electronic equipment need to operate under specific temperature conditions The next work can meet the requirements of use. Moreover, with the development of microelectronics technology and guidance technology, the integration of electronic equipment is getting higher and higher, the energy density is getting higher and ...

AI Technical Summary

Problems solved by technology

[0004] Due to the highly developed graphite lamellar structure of the existing high thermal conductivity graphite foam materials, as well as its porous structure and high porosity, the mechanical properties of graphite foam are not high, and its thermal conductivity is limited, so it is difficult to meet more requirements. Application requirements of thermal management devices with high energy density

As a new type of high thermal conductivity carbon-based composite material, high thermal conductivity carbon / carbon composite material has the characteristics of high temperature resistance and high strength, but its reinforcement base is a high thermal conductivity fiber braided prefabricated body, and the raw material of high thermal conductivity fiber can only be imported, and the price is expensive. The weaving cost of the upper fabric is high, the cycle is long, it is difficult to apply in batches, and the import of high thermal conductivity fibers, the key raw materials, is always limited.

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