Brazing composition, heat exchanger tube, and heat exchanger

Patent metadata

Field	Value
Publication number	US-10092983-B2
Application number	US-201314431840-A
Country	US
Kind code	B2
Filing date	Sep 26, 2013
Priority date	Oct 24, 2012
Publication date	Oct 9, 2018
Grant date	Oct 9, 2018

Abstract

A brazing composition contains 1 part by mass or more and 10 parts by mass or less of Zn powder, 1 part by mass or more and 5 parts by mass or less of Si powder, 3 parts by mass or more and 10 parts by mass or less of K—Al—F flux, 1 part by mass or more and 3 parts by mass or less of (meth)acrylic resin, wherein the mass ratio (Zn/Si) of Zn powder relative to Si powder is 1 or more and 5 or less.

First claim

The invention claimed is:

1. A heat exchanger tube comprising:
a tube main body, and
a coating for brazing formed at an external surface of the tube main body, the coating for brazing comprising:
1 g/m 2 or more and 10 g/m 2 or less of Zn powder,
1 g/m 2 or more and 5 g/m 2 or less of Si powder,
3 g/m 2 or more and 10 g/m 2 or less of a K—Al—F flux, and
1 g/m 2 or more and 3 g/m 2 or less of methacrylate resin, and
having a mass ratio (Zn/Si) of Zn powder relative to Si powder of 1 or more and 5 or less,
wherein the total amount of Zn powder, Si powder, K—Al—F flux, and (meth)acrylic resin is 6 g/m 2 or more and 20 g/m 2 or less,
the methacrylate resin is a (meth)acrylate polymer, and
the (meth)acrylate polymer is a copolymer of (meth)acrylates and methacrylic acid.

2. A heat exchanger produced by using the heat exchanger tube according to claim 1 .

3. A method of producing a coating, the method comprising applying a brazing composition to a coating and drying, the brazing composition comprising:
1 parts by mass or more and 10 parts by mass or less of Zn powder,
1 parts by mass or more and 5 parts by mass or less of Si powder,
3 parts by mass or more and 10 parts by mass or less of a K—Al—F flux, and
1 parts by mass or more and 3 parts by mass or less of methacrylate resin, and
having a mass ratio (Zn/Si) of Zn powder relative to Si powder of 1 or more and 4 or less,
such that the coating after the drying comprises
1 g/m 2 or more and 10 g/m 2 or less of Zn powder,
1 g/m 2 or more and 5 g/m 2 or less of Si powder,
3 g/m 2 or more and 10 g/m 2 or less of a K—Al—F flux, and
1 g/m 2 or more and 3 g/m 2 or less of methacrylate resin, and
has a mass ratio (Zn/Si) of Zn powder relative to Si powder of 1 or more and 5 or less,
wherein the total amount of Zn powder, Si powder, K—Al—F flux, and (meth)acrylic resin is 6 g/m 2 or more and 20 g/m 2 or less,
the methacrylate resin is a (meth)acrylate polymer, and
the (meth)acrylate polymer is a copolymer of (meth)acrylates and methacrylic acid.

Assignees

• Harima Chemicals Inc

Inventors

• Kiga Daigo

Classifications

• B23K35/3605

  Fluorides · CPC title

• F28F21/084

  from aluminium or aluminium alloys · CPC title

• F28D1/05383

  with multiple rows of conduits or with multi-channel conduits (F28D1/05391 takes precedence) · CPC title

• F28F21/089

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

• B23K35/3613

  Polymers, e.g. resins · CPC title