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

US12083625B2 · kind B2 · utility

Assignees

• RTX CORPORATION · US
• USA as Represented by the Administrator of the National Aeronautics and Space Administration · US

Inventors

• Xiaomei Fang · Niskayuna, US
• Christopher J. Hertel · Wethersfield, US
• John D. Riehl · Hebron, US
• John W. Connell · Newport News, US
• Frank L. Palmieri · Hampton, US
• John W. Hopkins · Sunnyvale, US

Key dates

• Filing date: Apr 3, 2020
• Grant date: Sep 10, 2024
• Expiry date: May 22, 2041

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B23K2103/05
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

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/mm2 and 1025 mJ/mm2 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.