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

A technology of high thermal conductivity graphite and carbon composite materials, applied in the preparation/purification of carbon, etc., can solve the problems of limited improvement of thermal conductivity, high price, long cycle, etc., achieve preparation cost and cycle compression, improve impregnation efficiency, good mechanics performance effect

Active Publication Date: 2017-12-22
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Using mesophase pitch with a softening point of 275°C, foaming and molding at a pressure of 7.0 MPa and a temperature of 330°C, and preparing high thermal conductivity graphite foam as a reinforcing base through carbonization at 900°C and graphitization at 3000°C. Preparation of graphite foam reinforced matrix with a density of 0.60g / cm 3 , the thermal conductivity is 138W / m·K, the porosity is 73%, and the open porosity is greater than 90%.

[0045] (2) Put the graphite foam reinforcing base prepared in step (1) into a coal pitch dipping tank, embed the graphite foam with coal pitch, close the lid and heat up to 200°C and vacuumize to -0.1MPa, heat preservation and pressure After 1 hour, pressurize to 15MPa, heat and hold pressure for 4 hours, then cool down freely.

[0046] (3) Put the sample impregnated with coal tar pitch in step (2) into a carbonization furnace for normal pressure carbonization. The carbonization process curve is: room temperature ~ 350 ° C, he...

Embodiment 2

[0053] (1) Using mesophase pitch with a softening point of 275°C, foaming and molding at a pressure of 7.5MPa and a temperature of 330°C, and preparing high thermal conductivity graphite foam as a reinforcing base through carbonization at 900°C and graphitization at 3000°C. Preparation of graphite foam reinforced matrix with a density of 0.65g / cm 3 , the thermal conductivity is 152W / m·K, the porosity is 71%, and the open porosity is greater than 90%.

[0054] (2), put the graphite foam reinforcing base prepared in step (1) into the mesophase pitch impregnation tank, wrap around the graphite foam with mesophase pitch, close the lid and heat up to 330°C and vacuumize to -0.1MPa, keep warm After holding the pressure for 1 hour, pressurize to 25MPa, keep the temperature and hold the pressure for 4 hours, and then cool down freely.

[0055] (3) Put the sample impregnated with mesophase pitch in step (2) into a carbonization furnace for normal pressure carbonization. The carbonizat...

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Abstract

The invention relates to a high thermal conductivity graphite foam / carbon composite material and a preparation method thereof. First, a graphite foam with high thermal conductivity is prepared as a reinforcing base by using mesophase pitch as a precursor; then, using mesophase pitch or coal tar pitch as a matrix carbon precursor The graphite foam reinforcing base is densified by medium and high pressure impregnation / carbonization technology; finally, the obtained material is subjected to a high-temperature graphitization treatment above 2500°C to obtain a density above 1.3g / cm3 and a thermal conductivity greater than 300W / m· K, the high thermal conductivity graphite foam / carbon composite material whose compressive strength can reach more than 9MPa, its thermal conductivity and compressive strength are more than 2 times and 3 times that of graphite foam material, compared with high thermal conductivity carbon / carbon composite material, the preparation cost and The period 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05C04B35/524C04B38/08
Inventor 冯志海余立琼樊桢宋永忠孔清
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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