Joining method and joining component

• US 9,505,084 B2
• Filed: 07/10/2012
• Issued: 11/29/2016
• Est. Priority Date: 09/22/2011
• Status: Active Grant

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Nissan Motor Co., Ltd.
• Inventors: Nakagawa, Shigeyuki, Yamamoto, Chika, Nanbu, Toshikazu, Uehara, Yoshitaka, Miyamoto, Kenji
• Primary Examiner(s): Nguyen, Chi Q
• Application Number:
  US14/345,031
• Publication Number:
  US 20140348576A1
• Time in Patent Office: 1,603 Days
• Field of Search: 403/265, 403/270, 403/272, 428/615, 219/148, 219/121.35, 219/121.85, 219/118, 228/249, 228/124.7
• US Class Current: 1/1
• CPC Class Codes: B23K 20/026 with diffusion of soldering material
• CPC Class Codes: B23K 20/16 with interposition of special material to facilitate connection of the parts, e.g. material for absorbing or producing gas
• CPC Class Codes: B23K 20/2333 one layer being aluminium, magnesium or beryllium
• CPC Class Codes: B23K 20/2336 both layers being aluminium
• CPC Class Codes: B23K 20/24 Preliminary treatment
• CPC Class Codes: B23K 2101/18 Sheet panels
• CPC Class Codes: B23K 2103/10 Aluminium or alloys thereof
• CPC Class Codes: B23K 26/037 by pressing on the workpiece, e.g. pressing roller foot
• CPC Class Codes: B23K 26/211 with interposition of special material to facilitate connection of the parts
• CPC Class Codes: B23K 26/244 Overlap seam welding
• CPC Class Codes: H01L 2224/32225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48227 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/48472 the other connecting portion not on the bonding area also being a wedge bond, i.e. wedge-to-wedge
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: Y10T 428/12493 Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]

Abstract

In joining members to be joined (1, 1) by heating the members to be joined (1, 1) that are mated with intervening an insert (2) while applying opposing loads to the members to be joined (1, 1), so as to allow eutectic reaction to occur between the members to be joined (1, 1) and the insert (2) to discharge a eutectic melt from a joining plane along with an oxide film (1a) of the members to be joined, the members to be joined (1) are brought into contact with the insert (2) so that the oxide film (1a) is broken by a stress concentrating means previously provided at least one of joining portions breaks to produce a starting point of the eutectic reaction.

Claims

1. A joining method comprising:

preparing two members to be joined, each of the two members to be joined having an oxide film disposed over a surface thereof,

preparing an insert including an uneven structure for breaking an oxide film, the uneven structure including at least one protrusion having an aspect ratio of greater than or equal to 0.001,

disposing the insert between the two members to be joined,

applying pressure to the two members to be joined to break the oxide film of the two members to be joined with the uneven structure of the insert, and

heating the two members to be joined to initiate a eutectic reaction between the two members to be joined and the insert, such that a eutectic melt produced by the eutectic reaction and the broken oxide film are discharged from between the two members to be joined.

2. The joining method according to claim 1, wherein the protrusion comprises an approximately flat face.

3. The joining method according to claim 1, wherein the protrusion comprises a linear shape.

4. The joining method according to claim 1, wherein the protrusion comprises an approximately pointed shape.

5. The joining method according to claim 1, wherein the protrusion comprises an approximately spherical shape.

6. The joining method according to claim 1, wherein the uneven structure comprises a plurality of protrusions, and a height of the protrusions of the uneven structure is not less than a difference in vertical position of crests of all of the protrusions.

7. The joining method according to claim 1, wherein the uneven structure has a pitch of 1 μ

m or more.

8. The joining method according to claim 7, wherein the uneven structure has an aspect ratio of 0.1 or more and a pitch of 10 μ

m or more.

9. The joining method according to claim 1, wherein the uneven structure comprises a plurality of protrusions with different shapes.

10. The joining method according to claim 1, wherein preparing the insert comprises forming the uneven structure by plastic forming.

11. The joining method according to claim 1, wherein the applied pressure is 30 MPa or less.

12. The joining method according to claim 1, wherein the insert is made of foil material.

13. A component produced by the joining method according to claim 1, wherein the two members to be joined are directly joined without an oxide film disposed between joined portions of the two members to be joined.

14. The component according to claim 13, wherein a component derived from the insert is diffused in a vicinity of joining faces of the two members to be joined.

15. A joining structure produced by the joining method according to claim 1, comprising:

a direct joining portion disposed between the two members to be joined, and

an indirect joining portion comprising a mixture of the oxide film of the two members to be joined and a product of the eutectic reaction,

wherein the direct joining portion and the indirect joining portion are randomly located on a joining interface.