Method for producing a functional structure and component

Patent metadata

Field	Value
Publication number	US-12403550-B2
Application number	US-202117396251-A
Country	US
Kind code	B2
Filing date	Aug 6, 2021
Priority date	Feb 8, 2019
Publication date	Sep 2, 2025
Grant date	Sep 2, 2025

Abstract

A method includes producing a functional structure on an aluminum surface with a local laser treatment of an aluminum surface. The local laser treatment is carried out with a pulsed laser system having a pulse duration of from 10 ns to 100 ns. The average power of the pulsed laser system is less than 5 kW.

First claim

What is claimed is:

1. A method comprising:
producing a functional structure on an aluminum surface with a local laser treatment of an aluminum surface, wherein
the local laser treatment is carried out with a pulsed laser system having a pulse duration of from 20 ns to 40 ns,
an average power of the pulsed laser system is less than 5 kW,
the functional structure comprises an oxide layer formed on the aluminum surface, the oxide layer having a thickness of from 60 nm to 700 nm,
a wavelength of the laser system is between 1000 nm and 1100 nm,
a zone of fusion or zone of thermal influence into the aluminum surface is at most 10 μm, and
the pulsed laser is applied at a focal position and with a Rayleigh length lying between 10 and 25 mm.

2. The method according to claim 1 , further comprising: forming a material connection between the aluminum surface and a joining partner, wherein the material connection is formed via the functional structure of the aluminum surface.

3. The method according to claim 2 , wherein the material connection is formed by adhesive bonding, welding, or soldering.

4. The method according to claim 1 , wherein the pulsed laser system has an average power of between 1 kW and 2 kW.

5. The method according to claim 4 , further comprising:
focusing the laser beam onto a diameter of from 500 μm to 3000 μm.

6. The method according to claim 1 , further comprising:
establishing the material connection after the local laser treatment.

7. The method according to claim 6 , wherein the local laser treatment is applied in an atmosphere, the atmosphere being a vacuum, an ambient atmosphere, or an inert gas or gas mixture.

8. The method according to claim 7 , wherein the aluminum surface belongs to a cast aluminum component.

9. The method according to claim 1 , wherein a beam of the pulsed laser system has a square shape.

10. The method according to claim 1 , further comprising: focusing the laser beam onto a diameter of from 900 μm to 1800 μm.

11. The method according to claim 1 , wherein the wavelength of the laser system is between 1030 nm and 1064 nm.

12. A method for producing a functional structure comprising:
applying a laser with a pulsed laser system having a pulse duration of from 20 ns to 40 ns and an average power of between 1 kW and 5 KW, to thereby produce the functional structure on an aluminum surface, wherein
the functional structure comprises an oxide layer formed on the aluminum surface, the oxide layer having a thickness of from 60 to 700 nm, and a wavelength of the laser system is between 1000 nm and 1100 nm,
a zone of fusion or zone of thermal influence into the aluminum surface is at most 10 μm, and
the pulsed laser is applied at a focal position and with a Rayleigh length lying between 10 and 25 mm.

13. The method according to claim 12 , further comprising: focusing the laser beam onto a diameter of from 900 μm to 1800 μm.

14. The method according to claim 12 , wherein the wavelength of the laser system is between 1030 nm and 1064 nm.

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Anasenzl Manuel
• Forstner Thomas
• Segaud Jean-Marc

Classifications

• C21D10/005

  by laser shock processing · CPC title

• B23K26/32 Primary

  taking account of the properties of the material involved · CPC title

• B23K26/125

  of mixed gases · CPC title

• B23K2103/10

  Aluminium or alloys thereof · CPC title

• B23K26/1224

  in vacuum · CPC title