Brazing sheet

Patent metadata

Field	Value
Publication number	US-2016101488-A1
Application number	US-201514882046-A
Country	US
Kind code	A1
Filing date	Oct 13, 2015
Priority date	Oct 13, 2014
Publication date	Apr 14, 2016
Grant date	—

Abstract

In one embodiment, a brazing sheet comprises: a core layer, a braze liner on the first side of the core layer; and a waterside liner on the second side of the core layer. The core layer is comprised of a 3xxx series aluminum alloy. The waterside liner is an aluminum alloy comprising: 7-20 wt % Zn; up to 0.25 wt % Si; up to 0.1 wt % Cu; up to 0.25 wt % Mn; up to 0.1 wt % Mg; and up to 0.1 wt % Cr. In some embodiments, the brazing sheet has a thickness of 60-180 microns. In some embodiments, the waterside liner comprises 1-15% of the thickness of the brazing sheet.

First claim

I claim:

1 . A brazing sheet comprising:
a. a core layer comprising:
i. a 3xxx series aluminum alloy;
ii. a first side;
iii. a second side;
b. a braze liner on the first side of the core layer; and c. a waterside liner on the second side of the core layer, wherein the waterside liner is an aluminum alloy comprising:
i. 7-20 wt % Zn;
ii. up to 0.25 wt % Si;
iii. up to 0.1 wt % Cu;
iv. up to 0.25 wt % Mn;
v. up to 0.1 wt % Mg; and
vi. up to 0.1 wt % Cr.

2 . The brazing sheet of claim 1 wherein the waterside liner comprises:
a. 7-20 wt % Zn;
b. up to 0.25 wt % Si;
c. up to 0.1 wt % Cu;
d. up to 0.25 wt % Mn;
e. up to 0.1 wt % Mg; and
f. up to 0.1 wt % Cr,
g. the remainder being aluminum, incidental elements and impurities.

3 . The brazing sheet of claim 1 wherein the waterside liner comprises 10-20 wt % Zn.

4 . The brazing sheet of claim 1 wherein the waterside liner comprises 12-20 wt % Zn.

5 . The brazing sheet of claim 1 wherein the waterside liner comprises 9-12 wt % Zn.

6 . The brazing sheet of claim 1 wherein the waterside liner comprises 16-20 wt % Zn.

7 . The brazing sheet of claim 1 wherein the core layer comprises:
a. 0.5-1.25 wt % Si;
b. 0.5-1.25 wt % Cu;
c. 0.5-2.0 wt % Mn;
d. up to 0.15 wt % Mg;
e. up to 0.1 wt % Cr;
f. up to 0.1 wt % Zn; and
g. 0.1-0.2 wt % Ti.

8 . The brazing sheet of claim 1 wherein the core layer comprises:
a. 0.5-1.25 wt % Si;
b. 0.5-1.25 wt % Cu;
c. 0.5-2.0 wt % Mn;
d. up to 0.15 wt % Mg;
e. up to 0.1 wt % Cr;
f. up to 0.1 wt % Zn; and
g. 0.1-0.2 wt % Ti,
h. the remainder being aluminum, incidental elements and impurities.

9 . The brazing sheet of claim 1 wherein the brazing sheet has a thickness of 60-180 microns.

10 . The brazing sheet of claim 1 wherein the brazing sheet has a thickness of 60-150 microns.

11 . The brazing sheet of claim 1 wherein the brazing sheet has a thickness of 80-150 microns.

12 . The brazing sheet of claim 1 wherein the brazing sheet has a thickness of 60-100 microns.

13 . The brazing sheet of claim 1 wherein the brazing sheet has a thickness of 60-180 microns.

14 . The brazing sheet of claim 1 wherein the brazing sheet has a thickness and the waterside liner comprises 7-15% of the thickness.

15 . The brazing sheet of claim 1 wherein the brazing sheet has a thickness and the waterside liner comprises 7-10% of the thickness.

16 . The brazing sheet of claim 1 wherein the brazing sheet has a thickness and the waterside liner comprises 5-15% of the thickness.

17 . The brazing sheet of claim 1 wherein the brazing sheet has a thickness and the waterside liner comprises 5-10% of the thickness.

18 . A brazing sheet comprising:
a. a core layer comprising:
i. a 3xxx series aluminum alloy;
ii. a first side;
iii. a second side;
b. a braze liner on the first side of the core layer; and c. a layer of zinc on the second side of the core layer.

19 . The brazing sheet of claim 18 wherein the layer of zinc comprises 99.9 wt % Zn.

20 . The brazing sheet of claim 18 wherein the brazing sheet has a thickness and the layer of zinc comprises less than 2% of the thickness.

Assignees

• Alcoa Inc

Inventors

• Ren Baolute

Classifications

• C22C18/00

  Alloys based on zinc · CPC title

• F28F21/089

  Coatings, claddings or bonding layers made from metals or metal alloys (F28F19/06 takes precedence) · CPC title

• B23K35/286 Primary

  Al as the principal constituent · CPC title

• B23K35/0238

  layered · CPC title

• B32B2307/714

  Inert, i.e. inert to chemical degradation, corrosion · CPC title