CONDUCTIVE JOINT ARTICLE AND METHOD FOR MANUFACTURING SAME

• US 20180111218A1
• Filed: 04/22/2016
• Published: 04/26/2018
• Est. Priority Date: 04/28/2015
• Status: Active Grant

• Current Assignee: Resonac Corp. (Resonac Holdings Corp.)
• Original Assignee: Hitachi Chemical Company Limited (Resonac Holdings Corp.)
• Inventors: NAITO, Takashi, TACHIZONO, Shinichi, YOSHIMURA, Kei, HASHIBA, Yuji, NAKAMURA, Kiyomi, ONODERA, Taigo, AOYAGI, Takuya, MIYAKE, Tatsuya
• Granted Patent: US 10,449,622 B2
• Time in Patent Office: Days
• CPC Class Codes: B22F 7/064 using an intermediate powder layer
• CPC Class Codes: B23K 1/0004 Resistance soldering
• CPC Class Codes: B23K 11/11 Spot welding
• CPC Class Codes: B23K 11/16 taking account of the properties of the material to be welded
• CPC Class Codes: B23K 11/18 of non-ferrous metals B23K11/20 takes precedence
• CPC Class Codes: B23K 35/0244 Powders, particles or spheres; Preforms made therefrom
• CPC Class Codes: B23K 35/262 Sn as the principal constituent
• CPC Class Codes: B23K 35/286 Al as the principal constituent
• CPC Class Codes: B23K 35/3006 Ag as the principal constituent
• CPC Class Codes: B23K 35/3013 Au as the principal constituent
• CPC Class Codes: B23K 35/302 Cu as the principal constituent
• CPC Class Codes: B23K 35/3033 Ni as the principal constituent
• CPC Class Codes: B23K 35/36 Selection of non-metallic compositions, e.g. coatings, fluxes B23K35/34 takes precedence; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest selection of soldering or welding materials proper B23K35/24
• CPC Class Codes: B23K 35/3601 with inorganic compounds as principal constituents
• CPC Class Codes: B23K 35/3602 Carbonates, basic oxides or hydroxides
• CPC Class Codes: B23K 35/361 Alumina or aluminates
• CPC Class Codes: C22C 1/05 Mixtures of metal powder with non-metallic powder C22C1/08 takes precedence
• CPC Class Codes: H01B 1/023 Alloys based on aluminium
• CPC Class Codes: H01B 1/026 Alloys based on copper
• CPC Class Codes: H01R 4/029 Welded connections H01R4/021 - H01R4/028 take precedence
• CPC Class Codes: H01R 43/0214 : Resistance welding H01R43/0228 takes precedence

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.

Claims

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, and

connection resistance between the joined members is less than 1×

10<sup>−

5</sup> Ω

/mm².

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 a conductive joint article,

the conductive joint article being with conductive joined members electrically joined via a joining material,

at least one of the joined members being made of a hard-to-solder joinable metal,

connection resistance between the joined members being less than 1×

10<sup>−

5</sup> Ω

/mm²,

the joining material including an oxide glass,

the oxide glass being a glass containing a vanadium oxide as a major constituent and at least one of a phosphorus oxide, a barium oxide and a tungsten oxide as an accessory constituent when nominal constituents thereof are expressed in terms of oxide, and having a glass transition point of 390°

C. or less,

the method 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 for manufacturing a conductive joint article according to claim 8, wherein

resistance welding conditions of the joined member joining treatment step are such that an applied current density is 80 A/mm² or more and 360 A/mm² or less and current application duration is 10 ms or more and 100 ms or less.

10. The method for manufacturing a conductive joint article according to claim 9, 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.

11. The method for manufacturing a conductive joint article according to claim 8, wherein

the hard-to-solder joinable metal is a light metal or a composite material including the light metal.

12. The method for manufacturing a conductive joint article according to claim 11, wherein

the light metal is aluminum, an aluminum alloy, and/or a magnesium alloy.

13. The method for manufacturing a conductive joint article according to claim 8, wherein

the oxide glass 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.

14. The method for manufacturing a conductive joint article according to claim 8, wherein

the oxide glass 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 for manufacturing a conductive joint article according to claim 14, wherein

the metal particle 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, and

when a total volumetric percentage of the oxide glass and the metal particle in the joining material is 100% by volume, the percentage of the metal particle is 10% by volume or more and 95% by volume or less.

16. The method for manufacturing a conductive joint article according to claim 13, wherein

the oxide glass 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.