Use of an alloy as a brazing alloy for an electric switch braze joint, an electric switch braze joint, an electric switch and a method of producing an electric switch braze joint

Patent metadata

Field	Value
Publication number	US-11052492-B2
Application number	US-201916242450-A
Country	US
Kind code	B2
Filing date	Jan 8, 2019
Priority date	Jul 8, 2016
Publication date	Jul 6, 2021
Grant date	Jul 6, 2021

Abstract

Embodiments of the present disclosure relate to an alloy as a brazing alloy for an electric switch braze joint, an electric switch braze joint, an electric switch and a method of producing an electric switch braze joint. The alloy composition of said the alloy consists of at least one element selected from each of group I and group II listed below, and a balance of impurities, Ag, and at least one of Cu, and Zn. Group I encompasses Cd, Mn, Ni, P, Sb, Si, Sn, Ti, and oxides thereof in a total amount of 0.5 to 45.0 wt. %. Group II encompasses Bi, Mo, Te, W, and oxides thereof, oxides of Cu and Zn in a total amount of 0.1 to 15.0 wt. %.

First claim

The invention claimed is:

1. An electric switch braze joint, comprising
an Ag-metal oxide contact material,
a carrier material; and
a brazed interlayer between the Ag-metal oxide contact material and the carrier material,
the electric switch braze joint being formed by brazing with an alloy as a brazing alloy having a composition consisting of:
at least one element selected from each of group I and group II listed below,
the balance being Ag and impurities, and optionally at least one of Cu, and Zn;
group I: Cd, Mn, Ni, P, Sb, Si, Sn, Ti, and oxides thereof in a total amount of 0.5 to 45.0 wt. %; and
group II: Bi, Mo, Te, W, and oxides thereof, oxides of Cu and Zn in a total amount of 0.1 to 15.0 wt. %.

2. The electric switch braze joint according to claim 1 , wherein
the balance is Aq and Cu, optionally at least one of P and Zn, and impurities;
group I: Cd, Mn, Ni, P, Sb, Si, Sn, Ti, and oxides thereof in a total amount of 0.5 to 45.0 wt. %; and
group II: Bi, Mo, Te, W, and oxides thereof, oxides of Cu and Zn in a total amount of 0.1 to 15.0 wt. %.

3. The electric switch braze joint according to claim 2 , wherein group I: Cd, Mn, Ni, P, Sb, Si, Sn, Ti, and oxides thereof in a total amount of up to 15.0 wt. %.

4. The electric switch braze joint according to claim 2 , wherein
the balance is Cu—Ag—P, optionally Zn, and impurities; and
group II: Bi, Mo, Te, W, and oxides thereof, oxides of Cu and Zn in a total amount of 0.1 to 15.0 wt %.

5. The electric switch braze joint alloy according to claim 4 , wherein group II: Bi2O3, CuO, MoO3, TeO2, WO3 and ZnO in a total amount of 0.1 to 15.0 wt. %.

6. The electric switch braze joint according to claim 1 , wherein the solidus temperature of the brazing alloy is at least 600° C. and a liquidus temperature of the brazing alloy is less than 950° C.

7. The electric switch braze joint according to claim 1 , wherein the brazing alloy can be used without flux.

8. The electric switch braze joint according to claim 1 , wherein group I consists of Cd, Mn, Ni, P, Sb, Si, Sn, Ti, and oxides thereof in a total amount of 5.0 to 20.0 wt. %.

9. The electric switch braze joint according to claim 8 , wherein group II consists of Bi, Mo, Te, W, and oxides thereof, oxides of Cu and Xn in a total amount of 0.5 to 8.0 wt. %.

10. The electric switch braze joint according to claim 8 , wherein group II consists of Bi, Mo, Te, W, and oxides thereof in a total amount of 0.5 to 8.0 wt. %.

11. The electric switch braze joint of claim 1 , wherein the balance is AG and CU, impurities and at least one of P and Zn.

12. The electric switch braze joint according to claim 11 , wherein, in the brazing alloy, the total amount of the at least one of Cu, Ag and Zn is 20.0 to 80.0 wt. %.

13. The electric switch braze joint according to claim 12 , wherein, in the brazing alloy, the amount of Zn in the balance is 5.0 to 40.0 wt. %.

14. The electric switch braze joint according to claim 1 , wherein at least one of a) and b) is fulfilled:
a) the Ag-metal oxide contact material comprises at least one of the following: Ag—CdO, Ag—SnO 2 , and Ag—ZnO; and
b) the carrier material comprises at least one of the following: Al, Al-based alloy, Cu, Cu-based alloy, Fe-based alloy, and steel.

15. An electric switch, having the braze joint according to claim 1 .

16. A method of producing an electric switch braze joint, comprising
providing an Ag-metal oxide contact material,
providing a carrier material,
providing an alloy between the Ag-metal oxide contact material and the carrier material, joining the Ag-metal oxide contact material and the carrier material by brazing with the alloy as a brazing alloy, wherein
the alloy composition consists of:
at least one element selected from each of group I and group II listed below,
the balance being Ag, optionally at least one of Cu, and Zn, and impurities;
group I: Cd, Mn, Ni, P, Sb, Si, Sn, Ti, and oxides thereof in a total amount of 0.5 to 45.0 wt. %; and
group II: Bi, Mo, Te, W, and oxides thereof, oxides of Cu and Zn in a total amount of 0.1 to 15.0 wt. %.

17. The method of producing an electric switch braze joint according to claim 16 , wherein
at least one of a) and b) is fulfilled:
a) the Ag-metal oxide contact material comprises at least one of the following: Ag—CdO, Ag—SnO 2 , and Ag—ZnO; and
b) the carrier material comprises at least one of the following: Al, Al-based alloy, Cu, Cu-based alloy, Fe-based alloy, and steel.

18. The method of producing an electric switch braze joint according to claim 17 , wherein the brazing is performed by induction brazing, resistance brazing, torch brazing, or furnace brazing.

19. The method of producing an electric switch braze joint according to claim 16 , wherein the brazing is performed by induction brazing, resistance brazing, torch brazing, or furnace brazing.

Assignees

• Abb Schweiz Ag

Inventors

• Boehm Moritz
• Schmoelzer Thomas
• Johansson Gunnar

Classifications

• B23K35/3026

  Mn as the principal constituent · CPC title

• B23K35/266

  Cd as the principal constituent · CPC title

• B23K35/264

  Bi as the principal constituent · CPC title

• B23K35/3033

  Ni as the principal constituent · CPC title

• B23K35/0238

  layered · CPC title