Nickel-based brazing foil and process for brazing

Patent metadata

Field	Value
Publication number	US-10137517-B2
Application number	US-201615082338-A
Country	US
Kind code	B2
Filing date	Mar 28, 2016
Priority date	Oct 15, 2007
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

An amorphous, ductile brazing foil is provided. According to one example embodiment, the composition consists essentially of Ni rest Cr a B b P c Si d with 2 atomic percent≤a≤30 atomic percent; 0.5 atomic percent≤b≤14 atomic percent; 2 atomic percent≤c≤20 atomic percent; 0 atomic percent≤d≤14 atomic percent; incidental impurities≤0.5 atomic percent; rest Ni, where c>b>c/15 and 10 atomic percent≤b+c+d≤25 atomic percent.

First claim

The invention claimed is:

1. An amorphous, ductile Ni-based brazing foil having a composition consisting essentially of
Ni rest Cr a B b P c Si d C e X f Y g
wherein a, b, c, d, e, f, and g are numbers such that 16 atomic percent≤a≤30 atomic percent; 0.5 atomic percent≤b≤14 atomic percent; 2 atomic percent≤c≤20 atomic percent; 0 atomic percent≤d≤14 atomic percent; 0 atomic percent≤e≤5 atomic percent; 0 atomic percent<f≤3 atomic percent; 0 atomic percent<g≤5 atomic percent; wherein incidental impurities are present, if at all, in amounts≤0.5 atomic percent; wherein rest indicates that the balance of the composition is Ni; wherein c>b>c/15; wherein 10 atomic percent≤b+c+d≤25 atomic percent, wherein X is one or more of the elements Mo, Nb, Ta, W and Cu; and wherein Y is one or both of the elements Fe and Co,
and wherein the foil varies in thickness from a mean thickness of the foil in a variation of less than 25% over a length of 200 m, the foil has a width B of 0.5 mm≤B≤300 mm, and the brazing foil is at least 50% amorphous.

2. The amorphous, ductile brazing foil in accordance with claim 1 , wherein the B content b is such that 1 atomic percent≤b≤8 atomic percent.

3. The amorphous, ductile brazing foil in accordance with claim 1 , wherein the P content c is such that 5 atomic percent≤c≤18 atomic percent.

4. The amorphous, ductile brazing foil in accordance with claim 1 , wherein the Si content d is such that d=0 atomic percent.

5. The amorphous, ductile brazing foil in accordance with claim 1 , wherein the Si content d is such that 0 atomic percent<d≤14 atomic percent.

6. The amorphous, ductile brazing foil in accordance with claim 1 , wherein the Y content g is 0 atomic percent≤g≤1 atomic percent.

7. The amorphous, ductile brazing foil in accordance with claim 1 , wherein the brazing foil is at least 80% amorphous.

8. The amorphous, ductile brazing foil in accordance claim 1 , wherein the foil has a thickness D of 15 μm≤D≤75 μm.

9. The amorphous, ductile brazing foil in accordance with claim 1 , wherein the width B is 30 mm≤B≤150 mm.

10. The amorphous, ductile brazing foil in accordance with claim 1 , wherein the foil varies in thickness from a mean thickness of the foil in a variation of less than 20% over a length of 100 m.

11. The amorphous, ductile brazing foil in accordance with claim 1 , wherein the foil varies in thickness from a mean thickness of the foil in a variation of less than 10% over a length of 5000 m.

12. The amorphous, ductile brazing foil in accordance with claim 1 , wherein the foil varies in thickness from a mean thickness of the foil in a variation of less than 15 μm over a length of 100 m.

13. A brazed object having a first part joined to a second part by a solder seam produced by heating the brazing foil of claim 2 .

14. The brazed object in accordance with claim 13 , wherein both the first part and the second part are made of a stainless steel.

15. The brazed object in accordance with claim 14 , wherein the solder seam has a thickness that is >15 μm.

16. The brazed object in accordance with claim 14 , wherein the brazed object is a heat exchanger.

17. The brazed object of claim 16 , wherein the heat exchanger is an exhaust gas recirculation cooler or an oil cooler.

18. The brazed object of claim 15 , wherein the brazed object is a heat exchanger.

Assignees

• Vacuumschmelze Gmbh & Co Kg
• Vacuumschmelze Gmbh & Co Kg

Inventors

• Hartmann Thomas
• Nuetzel Dieter

Classifications

• C22C1/11

  Making amorphous alloys · CPC title

• B23K35/0233

  Sheets or foils (B23K35/0244 takes precedence) · CPC title

• C22F1/002

  by rapid cooling or quenching; cooling agents used therefor · CPC title

• B23K1/0012 Primary

  Brazing of heat exchangers · CPC title

• F02M26/29

  Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials · CPC title