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Study on Graphite Composite of Radintor

Author: ZhangShaoJun
Tutor: ShiYuSheng
School: Huazhong University of Science and Technology
Course: Materials Processing Engineering
Keywords: Radiator Graphite Carbon fiber Thermal conductivity
CLC: TB332
Type: Master's thesis
Year: 2009
Downloads: 105
Quote: 0
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Abstract


Graphite material has a low density, high thermal conductivity for heat sink materials, specially designed to meet the development requirements of the electronic device lightweight, portable. In foreign countries, has been the production of a graphite radiator existing graphite radiator is only processed into the graphite flakes, assembled in the metal base, and because the strength of the graphite material is low, toughness is poor, it is difficult to directly forming a complicated shape, thereby greatly limit the application of the graphite material as a heat sink material, this paper focusing on improving the the graphite material mechanics, thermal conductivity expand. By melt mixing method, the wetting properties of different adhesive materials of graphite powder, epoxy resin, in the warm asphalt and modified asphalt wetting properties of graphite powder, but the epoxy resin in the carbonization process forming the structure of glass-like carbon, is disadvantageous to the the graphite composites mechanical properties and thermal conductivity, it is not chosen epoxy resin as an adhesive; high carbon residue by thermal gravimetric analysis to obtain a modified asphalt bitumen in the temperature, while residual the carbon high rate help to improve the mechanical properties and thermal conductivity of the material, modified bitumen was chosen as the adhesive. Experiment, the results found in the content of the adhesive must (20wt.%) of the graphite powder particle size optimum value D50 = 18.1μm, making the superiority of [the mechanical properties and thermal properties of the material through the selection of different particle size of the graphite powder; By changing the content of the adhesive was conducted to investigate the graphite-based composite material bending strength and thermal conductivity are increased with increasing binder content decreases in the content of the adhesive agent to 30wt%, the anti- The bending strength and thermal conductivity were the 10.65MPa and 10.789W m -1 K -1 . Chopped carbon fiber graphite material strength and low brittleness weaknesses, enhance research. The impact of the surface of the liquid phase oxidation treatment and the carbon fiber content on the composite properties of the carbon fibers, the experimental results show that: the liquid phase oxidation, can improve the bonding capacity of the carbon fibers and the matrix, thereby improving the bending strength of the composite material; as carbon fibers decrease; content increases, the flexural strength and thermal conductivity of the composite material is first increased when the carbon fiber content of 3wt.%, the maximum bending strength and thermal conductivity of the composite material, respectively of 14.06MPa, and 15.132W m < sup> -1 K -1 , significantly higher than the plus carbon fiber reinforced graphite matrix composites.

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Composite materials > Non-metallic composite materials
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