Conductive joint article and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-10449622-B2
Application number	US-201615567862-A
Country	US
Kind code	B2
Filing date	Apr 22, 2016
Priority date	Apr 28, 2015
Publication date	Oct 22, 2019
Grant date	Oct 22, 2019

Abstract

It is an objective of the invention to provide a conductive joint article exhibiting electrical joinability comparable to that of solder joining of easy-to-solder joinable metals even when a joined member of the conductive joint article is made of a hard-to-solder joinable metal. There is provided a conductive joint article with conductive joined members electrically joined via a joining layer, at least one of the joined members being made of a hard-to-solder joinable metal. The joining layer comprises an oxide glass phase and a conductive metal phase. The oxide glass phase includes vanadium as a major constituent and at least one of phosphorus, barium and tungsten as an accessory constituent, and has a glass transition point of 390° C. or less. And, connection resistance between the joined members exhibits less than 1×10−5 Ω/mm2.

First claim

The invention claimed is:

1. A conductive joint article with conductive joined members electrically joined via a joining layer, at least one of the joined members being made of a hard-to-solder joinable metal, wherein
the joining layer comprises an oxide glass phase and a conductive metal phase, the oxide glass phase containing vanadium as a major constituent and at least one of phosphorus, barium and tungsten as an accessory constituent, the oxide glass phase having a glass transition point of 390° C. or less,
the joining layer comprises a large number of conductive paths resulting from resistance welding, and a connection resistance between the joined members is less than 1×10 −5 Ω/mm 2 .

2. The conductive joint article according to claim 1 , wherein
the hard-to-solder joinable metal is a light metal or a composite material including the light metal.

3. The conductive joint article according to claim 2 , wherein
the light metal is aluminum, an aluminum alloy, and/or a magnesium alloy.

4. The conductive joint article according to claim 1 , wherein
the oxide glass phase further contains tellurium and/or silver as a major constituent, and has a glass transition point of 355° C. or less.

5. The conductive joint article according to claim 4 , wherein
the oxide glass phase further contains at least one of yttrium, lanthanum, iron and aluminum as an accessory constituent, and has a glass transition point of 200° C. or less.

6. The conductive joint article according to claim 1 , wherein
the conductive metal phase is made of at least one of gold, silver, copper, aluminum, nickel, tin, zinc and an alloy including one of them as a main constituent.

7. The conductive joint article according to claim 1 , wherein
the joining layer comprises 10% by volume or more and 95% by volume or less of the conductive metal phase and a balance of the oxide glass phase.

8. A method for manufacturing the conductive joint article of claim 1 ,
comprising:
a joining material preparation step of preparing the joining material; and
a joined member joining treatment step of interposing the joining material between the joined members and carrying out resistance welding.

9. The method according to claim 8 , wherein
resistance welding conditions of the joined member joining treatment step are such that a pressing stress on the joined member is 8 MPa or more and 15 MPa or less.

10. The method according to claim 8 , wherein
the hard-to-solder joinable metal is a light metal or a composite material including the light metal.

11. The method according to claim 10 , wherein
the light metal is aluminum, an aluminum alloy, and/or a magnesium alloy.

12. The method according to claim 8 , wherein
the oxide glass phase of the joining material further contains a silver oxide as a major constituent, has a glass transition point of 355° C. or less, but is not provided with metal particles.

13. The method according to claim 12 , wherein
the oxide glass phase of the joining material further contains at least one of a yttrium oxide, a lanthanum oxide, an iron oxide and an aluminum oxide as an accessory constituent, and has a glass transition point of 200° C. or less.

14. The method according to claim 8 , wherein
the oxide glass phase of the joining material further contains a tellurium oxide as a major constituent, has a glass transition point of 355° C. or less, and is mixed with metal particles.

15. The method according to claim 14 , wherein
the metal particles are made of at least one of gold, silver, copper, aluminum, nickel, tin, zinc and an alloy including one of them as a main constituent, and
when a total volumetric percentage of the oxide glass phase and the metal particles in the joining material is 100% by volume, the percentage of the metal particles is 10% by volume or more and 95% by volume or less.

Assignees

• Hitachi Chemical Co Ltd

Inventors

• Naito Takashi
• Tachizono Shinichi
• Yoshimura Kei
• Hashiba Yuji
• Nakamura Kiyomi
• Onodera Taigo
• Aoyagi Takuya
• Miyake Tatsuya

Classifications

• B23K35/361

  Alumina or aluminates · CPC title

• B23K35/3602

  Carbonates, basic oxides or hydroxides · CPC title

• B23K35/36

  Selection of non-metallic compositions, e.g. coatings or fluxes (B23K35/34 takes precedence); Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest · CPC title

• B23K35/3033

  Ni as the principal constituent · CPC title

• B22F7/064

  using an intermediate powder layer · CPC title