Laser Pulse Surface Texturing for Selective Microfeatures on Metals
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Solution Overview
Problem
Existing methods for texturing metallic substrates are limited in creating micro-scale or smaller surface features efficiently, particularly when aiming to increase surface area or modify adhesion and hydrophobicity, as they often result in larger surface features or require multiple processing steps.
Innovation Solution
A system comprising an energy source, a focusing system, and a controller that outputs energy pulses to create micro-scale or smaller surface texturing on metallic substrates by focusing energy pulses at or near the substrate's surface in contact with a liquid, allowing for simultaneous surface texturing and chemical modification, such as forming metal oxides or nitrides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional etching methods are used to texture metallic substrates, then surface area can be increased, but the feature size is limited to micro-scale or larger and multiple processing steps are required
Solution Approach 1:
The patent replaces conventional mechanical and chemical etching methods with a laser-based energy pulse system. The laser pulses are focused through a liquid medium to directly ablate and texture the metallic substrate surface, achieving micro-scale or smaller feature sizes without requiring multiple processing steps or masking operations.
Solution Approach 2:
The patent utilizes controlled changes in laser energy pulse parameters (duration, intensity, repetition rate) and focal positioning to precisely regulate the texturing process. By adjusting these parameters, the system can create features at micro-scale or smaller dimensions while maintaining process simplicity and eliminating the need for multiple processing stages.
2Reliability
If multiple processing steps are used for surface texturing, then surface area and adhesion can be improved, but productivity decreases due to increased processing time
Solution Approach 1:
The patent combines multiple functions (surface texturing, adhesion modification, and chemical treatment) into a single integrated laser processing step. The focused energy pulses simultaneously create the desired surface morphology and modify surface chemistry through interaction with the liquid medium, eliminating the need for sequential processing steps and thereby increasing productivity while maintaining or improving adhesion properties.
Solution Approach 2:
The laser-based system performs multiple functions in one operation: it textures the surface to increase area, modifies surface chemistry to enhance adhesion, and can selectively treat different regions. This multi-functional approach replaces multiple specialized processing steps with a single versatile system, improving both productivity and reliability.
3Area of stationary object
If conventional texturing methods are used, then surface area can be increased, but selective texturing without masking is not achievable
Solution Approach 1:
The patent employs a focused laser beam that can be precisely positioned and scanned across the substrate surface. By controlling the focal point location and movement pattern, the system creates texturing only in specific desired regions while leaving other areas unaffected. This localized processing capability eliminates the need for physical masking and enables selective surface area modification with high precision.
Solution Approach 2:
The patent replaces mechanical masking operations with a digitally controlled laser scanning system. The selectivity is achieved through software-controlled beam positioning rather than physical masks, allowing flexible and rapid reconfiguration of texturing patterns without additional manufacturing complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively increases the surface area of metallic substrates, enhances their capacitance, and modifies their surface chemistry, leading to improved performance in applications like medical devices, while reducing the number of processing steps and enabling selective surface texturing without prior masking.
Implementation Method 1
The controller may be configured to cause the energy source to output energy pulses to the focusing system and cause the focusing system to focus a focal volume of the energy pulses at or near the surface of the metallic substrate that is in contact with the liquid to create micro-scale or smaller surface texturing on the metallic substrate
Data Source
AI summary
A system includes an energy source, a focusing system, and a controller. The energy source is configured to output energy pulses to the focusing system. A chamber surrounds at least a portion of a metallic substrate and contain a liquid in contact with a surface of the metallic substrate. The controller is configured to cause the energy source to output energy pulses and cause the focusing system to focus a focal volume of the energy pulses at or near the surface of the metallic substrate that is in contact with the liquid to create micro-scale or smaller surface texturing on the metallic substrate.