粉末冶金法により作製したCu合金-黒鉛系放熱材料の熱伝導率と放熱性能

概要

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Metal-graphite composites having two types of microstructure were fabricated by powder metallurgical processing, and their thermal conductivities were measured to design heat spreaders. The microstructures and thermal conductivities of composites fabricated by a pressurized sintering were anisotropic. The inplane thermal conductivity increased from 350 to 443 W/mK with increasing graphite content from 50 to 75 vol%, which was much higher than the through-plane value from 100 to 63 W/mK. The calculated thermal barrier conductance h_c)of the metal-graphite interface in the composites was 1.9 to 2.1 × 10^7 W/m^2K. On the other hand, a composite having a graphite content of 74.8 vol%, which was fabricated using a combinated technique of the cold isostatic pressing(CIP)and a infiltration method, had an isotropic thermal conductivity of 265 W/mK. Based on the above data, the cooling performance of the anisotropic composite having a graphite content of 75 vol% as heat spreaders for a microprocessor unit was calculated using three-dimensional FEM. The calculation indicated that as the thickness of the composite decreased, the cooling performance of the composite approached that of pure Cu heat spreader having the same thickness.
社団法人日本セラミックス協会の論文
2001-11-01