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US 9,299,636 B2Granted
Heat sink for electronic device and process for production thereof
AssigneeJfe Precision Corporation
InventorsHoshiaki Terao, Hidoaki Kobiki
Life of this patent
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Abstract
A heat sink for an electronic device includes a Cr—Cu alloy layer including a Cu matrix and more than 30 mass % and not more than 80 mass % of Cr; and Cu layers provided on top and rear surfaces of the Cr—Cu alloy layer.
Claims16
A heat sink for an electronic device, comprising:
- a laminate comprising at least two Cr—Cu alloy layers comprising a Cu matrix and more than 30 mass % and not more than 80 mass % of Cr, and at least three Cu layers, which layers are alternately laminated,
- wherein an outmost layer of each of top and bottom surfaces of the laminate comprises a Cu layer, and bonding between the Cr—Cu alloy layer and the Cu layer is diffusion bonding.
A method for producing a heat sink comprising a Cr—Cu alloy layer having a Cu matrix and more than 30 mass % and not more than 80 mass % of Cr;
- and Cu layers provided on top and bottom surfaces of the Cr—Cu alloy layer, the method comprising:
- removing Cu on a surface of a Cr—Cu alloy sheet having a Cu matrix and more than 30 mass % and not more than 80 mass % of Cr, the Cu on the surface being residual Cu in infiltration treatment;
- joining a Cr—Cu alloy sheet to a Cu sheet by diffusion bonding;
- and
- rolling a resulting joined product, thereby producing a laminate having a Cr—Cu alloy layer and a Cu layer.
2 more elements
A method for producing a heat sink comprising a Cr—Cu alloy layer having a Cu matrix and more than 30 mass % and not more than 80 mass % of Cr;
- and Cu layers provided on top and bottom surfaces of the Cr—Cu alloy layer, the method comprising:
- preparing a Cu-infiltrated Cr sintered body containing a Cu matrix and more than 30 mass % and not more than 80 mass % of Cr;
- removing Cu on a surface of the Cu-infiltrated Cr sintered body, the Cu on the surface being residual Cu in infiltration treatment;
- rolling the Cu-infiltrated Cr sintered body, to obtain a Cr—Cu rolled sheet;
- joining the Cr—Cu rolled sheet to a Cu sheet, thereby producing a laminate having a Cr—Cu alloy layer and a Cu layer by diffusion bonding.
2 more elements
Dependencies are inferred from the claim text.