Graphite-copper composite material, heat sink member using the same, and method for producing graphite-copper composite material
AssigneeUbe Corporation
InventorsMasafumi Yoshimura, Dai Inamori, Kenichi Sunamoto
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Abstract
A graphite-copper composite material that includes a copper layer having an average thickness of 15 μm or less and scaly graphite particles laminated with the copper layer interposed therebetween. The graphite-copper composite material has a copper volume fraction of 3 to 20%. The graphite-copper composite material further has: (A) copper crystal grains of the copper layer having an average grain size of 2.8 μm or less, a mass fraction of Al of less than 0.02%, and a mass fraction of Si of less than 0.04%, or (B) an interfacial gap of the copper layer and the scaly graphite particles of 150 nm or less.
Claims8
A graphite-copper composite material comprising:
- a copper layer having an average thickness of 15 μm or less;
- and
- scaly graphite particles laminated with the copper layer interposed between the graphite particles,
- wherein the graphite-copper composite material has a copper volume fraction of 5 to 16% and a scaly graphite particle volume fraction of 84 to 95%, based on the total volume of the graphite and the copper, and
- wherein:
- (A) the copper layer contains copper crystal grains having an average grain size of 2.8 μm or less, a mass fraction of Al is less than 0.02%, and a mass fraction of Si is less than 0.04%, or
- (B) an interfacial gap of the copper layer and the scaly graphite particles is 150 nm or less.
Dependencies are inferred from the claim text.