Heat dissipation assembly and method for producing the same

• US 7,196,413 B2
• Filed: 03/01/2005
• Issued: 03/27/2007
• Est. Priority Date: 03/03/2004
• Status: Active Grant

• Current Assignee: Fuji Polymer Industries Co., Ltd. (Chugai Co., Ltd.), Dow Toray Co., Ltd. (Dow, Inc.), Nissan Motor Co., Ltd.
• Original Assignee: Fuji Polymer Industries Co., Ltd. (Chugai Co., Ltd.), Dow Corning Toray Company Limited (Dow, Inc.), Nissan Motor Co., Ltd.
• Inventors: Abe, Kazuyoshi, Ogawa, Kazuhiro, Kakehi, Toru, Ehira, Atsushi, Ikezawa, Atsushi, Shibuya, Akihiro, Furukawa, Motoyuki, Oota, Hirotoshi, Naruse, Mikio
• Primary Examiner(s): CLARK, SHEILA V
• Application Number:
  US11/069,293
• Publication Number:
  US 20050205989A1
• Time in Patent Office: 756 Days
• Field of Search: 257/706, 257/707, 257/712, 257/713, 257/719, 257/782, 257/783
• US Class Current: 257/707
• CPC Class Codes: C09K 5/14 Solid materials, e.g. powdery or granular
• CPC Class Codes: H01L 2224/32013 the layer connector being larger than the bonding area, e.g. bond pad
• CPC Class Codes: H01L 23/3735 Laminates or multilayers, e.g. direct bond copper ceramic substrates
• CPC Class Codes: H01L 23/3737 Organic materials with or without a thermoconductive filler
• CPC Class Codes: H01L 24/29 of an individual layer connector
• CPC Class Codes: H01L 24/32 of an individual layer connector
• CPC Class Codes: H01L 25/072 the devices being arranged next to each other

Abstract

A heat dissipation assembly in which a heat generator and a heat dissipator are integrated via an electrically insulating and thermally conductive sheet, at least one surface of which a thermally conductive grease is applied to, in which the thermally conductive grease is incompatible with the electrically insulating and thermally conductive sheet. Heat from the heat generator such as a semiconductor device or the like can be effectively dissipated while an electrically insulating condition is maintained over a long period of time.

Claims

1. A heat dissipation assembly comprising:

a) a heat generator;

b) a heat dissipator integrated with the heat generator;

c) an electrically insulating and thermally conductive sheet configured to integrate the heat generator and the heat dissipator; and

d) a thermally conductive grease layer formed from a thermally conductive grease which is incompatible with the electrically insulating and thermally conductive sheet such that substance migration does not substantially occur between the thermally conductive grease layer and the electrically insulating and thermally conductive sheet, the thermally conductive grease layer provided between at least one of (i) the electrically insulating and thermally conductive sheet and the heat generator and (ii) the electrically insulating and thermally conductive sheet and the heat dissipator.

2. The heat dissipation assembly of claim 1,

wherein the thermally conductive grease layer is provided on opposing surfaces of the electrically insulating and thermally conductive sheet.

6. The heat dissipation assembly of claim 1,

wherein the heat generator is a semiconductor device.

8. The heat dissipation assembly of claim 1,

wherein a change weight of at least one of the (i) thermally conductive grease layer and (ii) electrically insulating and thermally conductive sheet due to substance migration between the thermally conductive grease layer and the electrically insulating and thermally conductive sheet is less than 5%.

9. The heat dissipation assembly of claim 8,

wherein a change weight of at least one of the (i) thermally conductive grease layer and (ii) electrically insulating and thermally conductive sheet due to substance migration between the thermally conductive grease layer and the electrically insulating and thermally conductive sheet is less than 2%.

10. The heat dissipation assembly of claim 8,

wherein a change weight of at least one of the (i) thermally conductive grease layer and (ii) electrically insulating and thermally conductive sheet due to substance migration between the thermally conductive grease layer and the electrically insulating and thermally conductive sheet is less than 1%.

3. A heat dissipation assembly comprising:

a) a heat generator;

b) a heat dissipator integrated with the heat generator;

c) an electrically insulating and thermally conductive sheet configured to integrate the heat generator and the heat dissipator; and

d) a thermally conductive grease layer formed from a thermally conductive grease which is incompatible with the electrically insulating and thermally conductive sheet such that substance migration does not substantially occur between the thermally conductive grease layer and the electrically insulating and thermally conductive sheet, the thermally conductive grease layer provided between at least one of (i) the electrically insulating and thermally conductive sheet and the heat generator and (ii) the electrically insulating and thermally conductive sheet and the heat dissipator;

wherein the thermally conductive grease comprises one of (i) a perfluoropolyether-based composition, (ii) a C₆–

C₂₀ alkyl-modified silicone-based composition, and (iii) a fluorinated alkyl-modified silicone-based composition, and the electrically insulating and thermally conductive sheet comprises a methyl vinyl silicone-based rubber.

4. A heat dissipation assembly comprising:

a) a heat generator;

b) a heat dissipator integrated with the heat generator;

c) an electrically insulating and thermally conductive sheet configured to integrate the heat generator and the heat dissipator; and

d) a thermally conductive grease layer formed from a thermally conductive grease which is incompatible with the electrically insulating and thermally conductive sheet such that substance migration does not substantially occur between the thermally conductive grease layer and the electrically insulating and thermally conductive sheet, the thermally conductive grease layer provided between at least one of (i) the electrically insulating and thermally conductive sheet and the heat generator and (ii) the electrically insulating and thermally conductive sheet and the heat dissipator;

wherein the thermally conductive grease comprises one of (i) a dimethylsilicone-based composition, (ii) a perfluoropolyether-based composition, (iii) a C₆–

C₂₀ alkyl-modified silicone-based composition, and (iv) a methylphenylsilicone-based composition; and

the electrically insulating and thermally conductive sheet comprises a fluorosilicone-based rubber.

5. A heat dissipation assembly comprising:

a) a heat generator;

b) a heat dissipator integrated with the heat generator;

c) an electrically insulating and thermally conductive sheet configured to integrate the heat generator and the heat dissipator; and

d) a thermally conductive grease layer formed from a thermally conductive grease which is incompatible with the electrically insulating and thermally conductive sheet such that substance migration does not substantially occur between the thermally conductive grease layer and the electrically insulating and thermally conductive sheet, the thermally conductive grease layer provided between at least one of (i) the electrically insulating and thermally conductive sheet and the heat generator and (ii) the electrically insulating and thermally conductive sheet and the heat dissipator;

wherein the thermally conductive grease includes a mixture of thermally conductive fillers having different particle sizes.

7. A heat dissipation assembly comprising:

a) a heat generator;

b) a heat dissipator integrated with the heat generator;

c) an electrically insulating and thermally conductive sheet configured to integrate the heat generator and the heat dissipator; and

d) a thermally conductive grease layer formed from a thermally conductive grease which is incompatible with the electrically insulating and thermally conductive sheet and is provided between at least one of (i) the electrically insulating and thermally conductive sheet and the heat generator and (ii) the electrically insulating and thermally conductive sheet and the heat dissipator;

wherein a change weight of at least one of the (i) thermally conductive grease layer and (ii) electrically insulating and thermally conductive sheet due to substance migration between the thermally conductive grease layer and the electrically insulating and thermally conductive sheet is less than 10%.