Photo-Structurable Glass Redrawing Process
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Solution Overview
Problem
Current redrawing methods for glass production are limited by the crystallization tendency of photo-structurable glasses, which complicates the production process and results in inferior properties, especially when trying to balance crystallizability and photo-sensitivity, leading to issues like silver precipitation and devitrification.
Innovation Solution
A method involving a redrawing process that includes heating a deformation zone of photo-structurable glass containing specific crystal-agonists, crystal-antagonists, and nucleating agents, followed by a sensitization step with controlled cooling rates to adjust the glass's cooling state, allowing for the formation of alkali metasilicate crystals without premature crystallization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If photo-structurable glass with high crystallization tendency is used to achieve good photo-sensitivity and structuring capability, then photo-structurability is improved, but devitrification and premature crystallization occur during redrawing process
Solution Approach 1:
The patent applies parameter changes by carefully controlling the cooling rate from melt (1-100 K/min) and adjusting the composition ratios of crystal-agonists (Na2O: 10-30 wt%, K2O: 5-20 wt%) to SiO2 (70-80 wt%) to achieve a balance between photo-structurability and crystallization stability during redrawing
Solution Approach 2:
The patent uses a composite glass system combining SiO2 network formers with multiple modifiers (Na2O, K2O, CaO, MgO) and nucleating agents (CeO2, Ag), creating a composite material that exhibits both photo-sensitivity for structuring and controlled crystallization behavior during redrawing
2Adaptability or versatility
If the amount of silver and nucleating agents is increased to enhance photo-sensitivity, then photo-structurability is improved, but silver precipitation occurs during melting and production becomes complicated
Solution Approach 1:
The patent optimizes the concentration parameters of nucleating agents (CeO2: 0.1-5 wt%, Ag: 0.01-1 wt%) to achieve sufficient photo-sensitivity while preventing silver precipitation during melting, thereby simplifying production
Solution Approach 2:
The patent incorporates nucleating agents (CeO2, Ag) uniformly during the melting stage to ensure homogeneous distribution before redrawing, preventing localized silver precipitation and simplifying subsequent processing
3Ease of manufacture
If redrawing temperature is increased to enable drawing of photo-structurable glass, then processability is improved, but crystal formation occurs and glass becomes unusable
Solution Approach 1:
The patent adjusts the heating rate parameter (0.1-10 K/min) and holds the glass in the deformation temperature range (400-700°C) long enough to achieve desired shape change while avoiding temperatures that would cause devitrification
Solution Approach 2:
The patent dynamically controls the heating and cooling rates during redrawing, using slow heating (0.1-10 K/min) to avoid thermal shock and controlled cooling to prevent crystal formation, enabling successful processing of photo-structurable glass
4Reliability
If cooling rate is increased to prevent crystallization during redrawing, then crystallization stability is improved, but photo-structurability and structuring capability are reduced
Solution Approach 1:
The patent optimizes the cooling rate parameter (1-100 K/min from melt) to achieve a balance: fast enough to prevent devitrification during redrawing, but slow enough to allow proper nucleation and crystallization during subsequent tempering for photo-structurability
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
Enables the production of glass with balanced crystallizability and photo-sensitivity, avoiding premature crystallization and silver precipitation, thus allowing for deeper UV light penetration and finer structure formation, enhancing the glass's photo-structurability and profitability by eliminating post-processing steps like grinding and polishing.
Implementation Method 1
heating a deformation zone of the blank
Implementation Method 2
The glass is cooled from a temperature T1 to a temperature T2 with a cooling rate K
Implementation Method 3
the desired crystal nuclei are formed around the generated atomic silver
Data Source
AI summary
A method for production of a photo-structurable glass element is provided. The method includes the steps of: fixing a blank of photo-structurable glass at a first end; heating of a deformation zone of the blank; and drawing the blank. The glass includes Si4+, a crystal-agonist, a crystal-antagonist, and a pair of nucleating agents. The crystal-agonist is selected from the group consisting of Na+, K+, Li+, and any combinations thereof. The crystal-antagonist is selected from the group consisting of Al3+, B3+, Zn2+, Sr2+, Sb3+, and any combinations thereof. The pair of nucleating agents include cerium and an agent selected from the group consisting of silver, gold, copper, and any combinations thereof. The crystal-agonist has a molar proportion cat.-% in relation to a molar proportion of Si4+ that is at least 0.3 and at most 0.85.