US 12,403,550 B2
Method for producing a functional structure and component
Manuel Anasenzl, Mainburg (DE); Thomas Forstner, Valley (DE); and Jean-Marc Segaud, Landshut (DE)
Assigned to Bayerische Motoren Werke Aktiengesellschaft, Munich (DE)
Filed by Bayerische Motoren Werke Aktiengesellschaft, Munich (DE)
Filed on Aug. 6, 2021, as Appl. No. 17/396,251.
Application 17/396,251 is a continuation of application No. PCT/EP2020/051700, filed on Jan. 24, 2020.
Claims priority of application No. 10 2019 103 130.3 (DE), filed on Feb. 8, 2019.
Prior Publication US 2021/0362275 A1, Nov. 25, 2021
Int. Cl. B23K 26/12 (2014.01); B23K 26/32 (2014.01); B23K 26/356 (2014.01); B23K 103/10 (2006.01); C21D 10/00 (2006.01)
CPC B23K 26/356 (2015.10) [B23K 26/1224 (2015.10); B23K 26/125 (2013.01); B23K 26/32 (2013.01); C21D 10/005 (2013.01); B23K 2103/10 (2018.08)] 14 Claims
OG exemplary drawing
 
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.