JOINING METHOD AND JOINING COMPONENT

• US 20140348576A1
• Filed: 07/10/2012
• Published: 11/27/2014
• Est. Priority Date: 09/22/2011
• Status: Active Grant

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Nissan Motor Co., Ltd.
• Inventors: Uehara, Yoshitaka, Miyamoto, Kenji, Nanbu, Toshikazu, Nakagawa, Shigeyuki, Yamamoto, Chika
• Granted Patent: US 9,505,084 B2
• Time in Patent Office: Days
• US Class Current: 403/272
• 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

1-20. -20. (canceled)

21. A joining method, comprising:

joining members to be joined by heating the members to be joined that are mated with an intervening insert while applying opposing loads to the members to be joined, so as to allow a eutectic reaction to occur between the members to be joined and the insert to discharge a resulting eutectic melt from a joining plane along with an oxide film of the members to be joined,

wherein a stress concentrating means to break an oxide film is provided on at least one joining portion, and the stress concentrating means comprises an uneven structure having an aspect ratio of 0.001 or more.

22. The joining method according to claim 21, wherein the stress concentrating means is provided on at least one joining face of the members to be joined.

23. The joining method according to claim 22, wherein the stress concentrating means is provided on both of the joining faces of the members to be joined.

24. The joining method according to claim 21, wherein the stress concentrating means is provided on the insert.

25. The joining method according to claim 21, wherein the stress concentrating means comprises an uneven structure, and a protrusion tip of the uneven structure comprises an approximately flat face.

26. The joining method according to claim 21, wherein the stress concentrating means comprises an uneven structure, and a protrusion tip of the uneven structure comprises a linear shape.

27. The joining method according to claim 23, wherein the stress concentrating means comprises an uneven structure and a protrusion tip of the stress concentrating means comprises a linear shape, and wherein a plurality of the stress concentrating means are arranged in a position crossing each other.

28. The joining method according to claim 21, wherein the stress concentrating means comprises an uneven structure, and a protrusion tip of the uneven structure comprises an approximately pointed shape.

29. The joining method according to claim 21, wherein the stress concentrating means comprises an uneven structure and a protrusion tip of the uneven structure comprises an approximately spherical shape.

30. The joining method according to claim 21, wherein a height of protrusions of the uneven structure is not less than a difference in vertical position of crests of all of the protrusions.

31. The joining method according to claim 21, wherein the uneven structure has a pitch of 1 μ

m or more.

32. The joining method according to claim 31, wherein the uneven structure has an aspect ratio of 0.1 or more and a pitch of 10 μ

m or more.

33. The joining method according to claim 21, wherein the uneven structure comprises a plurality of protrusions with different shapes.

34. The joining method according to claim 21, wherein the uneven structure is formed by plastic forming.

35. The joining method according to claim 21, wherein an applied pressure during joining is 30 MPa or less.

36. The joining method according to claim 21, wherein the insert is made of foil material.

37. A joined component joined by the method according to claim 21, wherein the members to be joined are directly joined at respective fresh surfaces.

38. The joined component according to claim 37, wherein a component derived from the insert is diffused in a vicinity of joining faces of the members to be joined.

39. A joining structure produced by the method according to claim 21, comprising a direct joining portion between the members to be joined and an indirect joining portion mediated by a mixture containing an oxide film of the members to be joined and a eutectic reaction product, wherein the direct joining portion and the indirect joining portion are randomly located on a joining interface.

40. A joining method comprising:

joining members to be joined by heating the members to be joined that are mated with an intervening insert while applying opposing loads to the members to be joined, so as to allow a eutectic reaction to occur between the member to be joined and the insert to discharge a resulting eutectic melt from a joining plane along with an oxide film of the members to be joined,

wherein an uneven structure having an aspect ratio of 0.001 or more is provided on at least one joining portion, and wherein the uneven structure is configured to break an oxide film.

41. The joining method according to claim 40, wherein the uneven structure is provided on at least one joining face of the members to be joined.

42. The joining method according to claim 41, wherein the uneven structure is provided on both of the joining faces of the members to be joined.

43. The joining method according to claim 40, wherein the uneven structure is provided on the insert.

44. The joining method according to claim 40, wherein the uneven structure comprises a protrusion tip, and the protrusion tip comprises an approximately flat face.

45. The joining method according to claim 40, wherein the uneven structure comprises a protrusion tip, and the protrusion tip comprises a linear shape.

46. The joining method according to claim 42, wherein the uneven structure comprises a protrusion tip, and the protrusion tip comprises a linear shape, and a plurality of the uneven structures are arranged in a position crossing each other.

47. The joining method according to claim 40, wherein the uneven structure comprises a protrusion tip, and the protrusion tip comprises an approximately pointed shape.

48. The joining method according to claim 40, wherein the uneven structure comprises a protrusion tip, and the protrusion tip comprises an approximately spherical shape.

49. The joining method according to claim 40, wherein a height of protrusions of the uneven structure is not less than a difference in vertical position of crests of all of the protrusions.

50. The joining method according to claim 40, wherein the uneven structure has a pitch of 1 μ

m or more.

51. The joining method according to claim 50, wherein the uneven structure has an aspect ratio of 0.1 or more and a pitch of 10 μ

m or more.

52. The joining method according to claim 40, wherein the uneven structure comprises a plurality of protrusions with different shapes.

53. The joining method according to claim 40, wherein the uneven structure is formed by plastic forming.

54. The joining method according to claim 40, wherein an applied pressure during joining is 30 MPa or less.

55. The joining method according to claim 40, wherein the insert is made of foil material.

56. A joined component joined by the method according to claim 40, wherein the members to be joined are directly joined at respective fresh surfaces.

57. The joined component according to claim 56, wherein a component derived from the insert is diffused in a vicinity of joining faces of the members to be joined.

58. A joining structure produced by the method according to claim 40, comprising a direct joining portion between the members to be joined and an indirect joining portion mediated by a mixture containing an oxide film of the members to be joined and a eutectic reaction product, wherein the direct joining portion and the indirect joining portion are randomly located on a joining interface.