Laser surface treatment on stainless steel and nickel alloys for adhesive bonding

Patent metadata

Field	Value
Publication number	US-2024391025-A1
Application number	US-202418793596-A
Country	US
Kind code	A1
Filing date	Aug 2, 2024
Priority date	Apr 5, 2019
Publication date	Nov 28, 2024
Grant date	—

Abstract

Methods and systems for the laser surface treatment on stainless steel alloys and nickel alloys may include a computer may be programmed to set a laser path corresponding to a predetermined geometric pattern. A laser may be coupled to the computer and apply a pulsed laser beam to a contact surface of the substrate along the predefined geometric pattern. The pulsed laser beam may have a laser power between 0.1 W and 100 W, single pulse fluence 1 mJ/mm 2 and 1025 mJ/mm 2 and a laser speed between 25.4 cm/s and 127 cm/s. The laser may generate an open pore oxide layer on the contact surface of the substrate with a thickness of 0.1-1 μm, an open pore distance of 0.05-1 μm. The open pore oxide layer may have a topography corresponding to the predefined geometric pattern. The topography may contain open pore structures and promote adhesive bond performance.

First claim

What is claimed is:

1 . A surface treating system comprising:
a computer-based system configured to define a predefined geometric pattern on a contact surface; and a laser coupled to the computer-based system, the laser being configured to provide a pulsed laser beam to the contact surface, the pulsed laser beam having a single pulse fluence between 1 mJ/mm 2 and 1025 mJ/mm 2 , the laser being configured to generate a porous oxide layer on the contact surface of a substrate.

2 . The surface treating system of claim 1 , further comprising a computer numeric control (CNC) tool, the CNC tool being coupled to the laser and electrically coupled to the computer-based system.

3 . The surface treating system of claim 2 , wherein the laser is configured to travel along a three-dimensional path and surface treat a complex three-dimensional surface.

4 . The surface treating system of claim 2 , further comprising a shroud disposed around the laser and the CNC tool, and wherein the CNC tool and the laser are co-axial.

Assignees

• Rtx Corp
• Nasa

Inventors

• Fang Xiaomei
• Hertel Christopher J
• Riehl John D
• Connell John W
• Palmieri Frank L
• Hopkins John W

Classifications

• B23K26/0622

  by shaping pulses · CPC title

• B23K2103/05

  Stainless steel · CPC title

• F16B11/006

  by gluing (gluing of plastics material B29C65/48) · CPC title

• B23K26/359 Primary

  by providing a line or line pattern, e.g. a dotted break initiation line · CPC title

• B23K26/3584 Primary

  Increasing rugosity, i.e. roughening · CPC title