Method for preparing natural graphite base composite material

A technology of natural graphite and composite materials, applied in building insulation materials, petroleum industry, fibrous fillers, etc., can solve the problems of low material strength, achieve good thermal stability, convenient operation, and cost reduction

Inactive Publication Date: 2008-02-13
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

U.S. Patent 4,963,414 proposes a "sandwich" structure radiator, that is, the middle part is a sheet of natural graphite and pitch, and the upper and lower sheets are metal sheets. The above three sheets are bonded by epoxy resin, but there is a problem of low material strength.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Using natural graphite as raw material, the addition amount is 70%, the binder is coal tar pitch, the softening point is 105°C, the filler is carbon nanotubes, the content is 0.1% of the pitch weight, and the addition amount of the binder mixture is 22% , the doping component is Si powder, and the addition amount is 8%. Mix the above-mentioned mixtures evenly, and hot-press molding at 2400°C and a pressure of 15MPa, and the constant temperature time is 30min. The room temperature properties of the prepared composite material are: the bending strength is 40MPa, and the thermal conductivity is 260W / m.K.

Embodiment 2

[0026] Using natural graphite as raw material, the addition amount is 60%, the binder is coal tar pitch, the softening point is 200°C, the filler is carbon nanotubes, the content is 0.1% of the pitch weight, and the addition amount of the binder mixture is 30% , the doping component is ZrO 2 Powder, the amount added is 10%. The above-mentioned mixture was mixed evenly, and hot-pressed at 2600° C. and a pressure of 20 MPa, and the constant temperature time was 40 minutes. The room temperature properties of the prepared composite material are: the bending strength is 38MPa, and the thermal conductivity is 430W / m.K.

Embodiment 3

[0028] Use natural graphite as raw material, the addition amount is 50%, the binder is coal tar pitch, the softening point is 120°C, the filler is carbon fiber, the content is 60% of the pitch weight, the addition amount of the binder mixture is 35%, mixed The hetero component is Ti powder, and the addition amount is 15%. Mix the above-mentioned mixtures evenly, and hot-press molding at 2800°C and a pressure of 50MPa, and the constant temperature time is 60min. The room temperature properties of the prepared composite material are: the bending strength is 60MPa, and the thermal conductivity is 350W / m.K.

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Abstract

The invention provides a method for preparing a natural graphite-based composite material. Dissolve the asphalt with an organic solvent, add filler, mix evenly, remove the solvent, and break it into small particles to obtain an adhesive mixture; the percentage by weight is 50-70% of natural graphite powder, 2-20% of doped catalytic graphitization components 1. The proportion of the binder mixture is 22-35%. The above raw materials are uniformly mixed to obtain a mixture; the mixture is prepared by a conventional process or a hot pressing process to prepare a graphite-based composite material with high strength and high thermal conductivity. The advantages of the present invention are reflected in: due to the addition of filler carbon nanotubes, carbon fibers or silicon carbide fibers with a reinforcing effect in the raw materials, the strength of the prepared graphite composite material is significantly improved, and at the same time, the catalytic graphitization components added in the raw materials, The degree of graphitization of the graphite composite material can be improved, thereby improving its thermal conductivity. Therefore, natural graphite can be used as raw material instead of coke to prepare graphite composite materials with high strength and high thermal conductivity. The bending strength is greater than 30MPa, the thermal conductivity is greater than 250W / m.K, and the cost is significantly reduced.

Description

(1) Technical field [0001] The invention relates to a method for preparing a composite material, in particular to a method for preparing a natural graphite-based composite material. (2) Background technology [0002] In microelectronic integrated circuits and high-power rectifier devices, dense and numerous micro-sized components generate a lot of heat, thermal stress fatigue and poor heat dissipation performance caused by the mismatch between the thermal expansion coefficient between the chip and the heat dissipation material, resulting in Chip overheating has become the main failure mode of microelectronic circuits and devices, and the heat dissipation of electronic components has become a bottleneck problem restricting system performance. [0003] With the development of integrated circuits towards high density, miniaturization, and multi-function, the requirements for electronic packaging materials are becoming more and more stringent. As an ideal heat dissipation mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08K3/04C10B55/00C09C1/46
Inventor 范壮军魏彤
Owner HARBIN ENG UNIV
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