Acid-Etched Aluminosilicate Glass With Reflective Polyhedral Features
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Solution Overview
Problem
Conventional texturing processes fail to produce the desired reflective appearance and/or enhanced tactile impression on certain aluminosilicate glass articles, which are sought after for their superior ion-exchangeability and drop performance.
Innovation Solution
The development of textured glass articles featuring polyhedral or dendritic surface features, achieved through a chemical etching process using an etchant with a pH less than or equal to 3.0, which selectively generates silicon-based or aluminum-based precipitates to create the desired surface morphology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional texturing processes are used on aluminosilicate glass articles, then the glass maintains its superior ion-exchangeability and drop performance, but the desired reflective appearance and tactile impression cannot be achieved
Solution Approach 1:
The patent changes the chemical parameters of the etching process by using an etchant with pH less than or equal to 3.0, which is more aggressive than conventional etchants. This parameter change enables the formation of polyhedral surface features with specific facet geometries that provide the desired reflective appearance while maintaining compatibility with aluminosilicate glass compositions having Al2O3/SiO2 ratios of 0.25 or less
Solution Approach 2:
The patent creates a composite surface structure by forming polyhedral surface features with multiple facets on the glass substrate. These features have specific geometric characteristics (base sizes of 10-100 μm, facet angles of 5-15 degrees) that combine to produce both the desired optical properties (reflective appearance) and tactile properties (enhanced impression) while maintaining the underlying glass material's strength properties
2Strength
If the Al2O3 content in the glass is increased to improve strength properties, then ion-exchangeability and drop performance are enhanced, but conventional texturing processes fail to produce the desired surface appearance
Solution Approach 1:
The patent modifies the etching process parameters by employing an etchant with pH less than or equal to 3.0, which provides sufficient etching power to work with high Al2O3 content glass compositions. This enables the formation of well-defined polyhedral surface features even on glass with Al2O3 content of 16 wt% or more, maintaining both strength properties and manufacturability
3Illumination intensity
If polyhedral surface features with small base sizes are created to enhance reflectivity, then the reflective appearance improves, but the surface feature size becomes difficult to control within the desired range
Solution Approach 1:
The patent optimizes the etching parameters by using an etchant with pH less than or equal to 3.0 and controlling the etching time to achieve surface features with base sizes in the range of 10-100 μm. The combination of the aggressive etchant and controlled processing time enables consistent formation of polyhedral features with appropriate dimensions that provide both reflectivity and manufacturability
Solution Approach 2:
The patent incorporates process control mechanisms to monitor and adjust etching parameters in real-time, ensuring that surface features maintain the desired base size range of 10-100 μm. This feedback control allows consistent production of polyhedral features with the optimal balance between reflective appearance and manufacturing precision
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
The resulting textured glass articles exhibit a highly reflective appearance and/or enhanced tactile impression, with specific properties such as transmittance haze, surface roughness, and reflectance values that meet the desired specifications.
Implementation Method 1
a chemical etching process using an etchant with a pH less than or equal to 3.0, which selectively generates silicon-based or aluminum-based precipitates to create the desired surface morphology
Implementation Method 2
an etchant with a pH less than or equal to 3.0, which selectively generates silicon-based or aluminum-based precipitates to create the desired surface morphology
Data Source
AI summary
A textured glass article includes: a body comprising an aluminosilicate glass comprising greater than or equal to 16 wt % Al2O3 and a Al2O3/SiO2 ratio less than or equal to 0.3, the body having at least a first surface; a plurality of polyhedral surface features extending from the first surface, each of the plurality of polyhedral surface features comprising a base on the first surface, a plurality of facets extending from the first surface, and a surface feature size at the base greater than or equal to 10 μm and less than or equal to 100 μm, wherein the plurality of facets of each polyhedral surface feature converge toward one another; and a transmittance haze greater than or equal to 50%.