Glass Processing with Organic Alkaline Etching for Complex Structures
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Solution Overview
Problem
Existing methods struggle to produce intricate, high-quality glass structures efficiently and cost-effectively, particularly for glasses that are difficult to etch in water-based solutions, with issues of process time and structural integrity.
Innovation Solution
A nearly water-free alkaline etching process using an organic solvent with a high boiling point, such as ethylene glycol, at elevated temperatures, facilitates rapid and precise glass removal, especially for glasses with titanium compounds, by employing ultrashort pulse lasers to introduce flaws that are expanded by the alkaline etching medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If water-based alkaline etching medium is used, then the etching process is simple and inexpensive, but the etching rate is slow and some glasses cannot be etched
Solution Approach 1:
The patent changes the fundamental parameter of the etching medium from water-based to organic solvent-based (specifically ethylene glycol). This parameter change enables significantly higher etching rates (up to 20 μm per hour compared to less than 8 μm per hour) and allows etching of glass types that cannot be processed with water-based solutions, such as those containing titanium compounds.
Solution Approach 2:
The patent utilizes the high boiling point of organic solvents (ethylene glycol boils at 197°C compared to water at 100°C) to enable etching at elevated temperatures. This phase transition capability allows the process to operate at temperatures above 130°C, which dramatically accelerates the etching rate while maintaining process control.
2Manufacturing precision
If conventional etching methods are used, then the process is simple, but intricate and complex glass structures cannot be produced with high quality
Solution Approach 1:
The patent applies preliminary laser treatment to the glass surface before etching, introducing controlled flaws and modifications that guide the subsequent etching process. This preliminary action enables the formation of precise channels, holes, and complex structures with accuracies in the range of a few micrometers, while the etching medium simply follows the predetermined paths.
Solution Approach 2:
The patent uses an organic solvent-based alkaline etching medium as an intermediary between the laser-prepared glass surface and the final structured product. This intermediary enables the transformation of laser-induced flaws into precise structural features, achieving high manufacturing precision for complex glass structures.
3Adaptability or versatility
If water-based etching medium is used, then the process is straightforward, but glasses with titanium compounds cannot be easily structured
Solution Approach 1:
The patent changes the chemical composition parameter of the etching medium from water-based to organic solvent-based. This parameter change fundamentally alters the solubility characteristics, enabling the etching of glasses containing titanium compounds and other materials that are insoluble or difficult to etch in water-based solutions.
Solution Approach 2:
The patent employs a composite etching system combining organic solvent (ethylene glycol) with alkaline agents, creating a specialized medium that can dissolve a broader range of glass components including titanium compounds, thereby expanding the versatility of the etching process to handle diverse glass compositions.
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 method achieves fast etching rates of up to 20 μm per hour, enabling precise and efficient production of complex glass structures without damage or residue, suitable for various glass compositions including borosilicate and soda lime silicate glasses.
Implementation Method 1
glass material is removed of the glass element, whereby the removal is carried out by etching and wherein an alkaline etching medium in an organic solvent is used
Implementation Method 2
the boiling point in specific organic solvents is much higher than the one of water-based alkaline etching medium. Therefore, etching in an organic solvent can be at higher temperatures and therefore much faster
Implementation Method 3
employing ultrashort pulse lasers to introduce flaws that are expanded by the alkaline etching medium
Data Source
AI summary
A method for processing glass is provided. The method includes the steps of providing a glass element and removing glass material from the glass element by etching with an alkaline etching medium in an organic solvent.