Silica Composite Bonding via Silane Slurry
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Solution Overview
Problem
Existing methods for bonding quartz glass components, particularly black glass, face challenges such as plastic deformation, limited temperature control, and rapid cooling due to high heat emission, making large-area connections difficult and inefficient.
Innovation Solution
A method involving the application of two SiO2-containing slurry masses with different concentrations of additional components, sintered or vitrified together to form a composite body, allowing for a stable and thermally uniform bonding process without the need for additional hot working steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welding is used to connect quartz glass components, then mechanical connection is achieved, but plastic deformation occurs in the welding zone
Solution Approach 1:
The invention changes the bonding mechanism from mechanical welding to chemical bonding using silane-modified slurry. By adjusting the slurry composition (adding silane groups) and curing parameters (temperature, humidity, time), strong chemical bonds are formed without the high temperatures that cause plastic deformation, thus maintaining dimensional accuracy while achieving connection strength
Solution Approach 2:
The silane-modified slurry acts as an intermediary bonding agent between quartz glass surfaces. The slurry contains silane groups that react with hydroxyl groups on the glass surface, forming covalent Si-O-Si bonds. This intermediary chemical bonding mechanism avoids direct thermal contact and melting, preventing plastic deformation while ensuring strong adhesion
2Strength
If black glass is heated for welding, then bonding is attempted, but rapid cooling occurs due to high heat emission
Solution Approach 1:
The invention replaces the thermal welding process with a chemical bonding process using silane-modified slurry. Instead of relying on heat to melt and fuse the glass (which causes rapid cooling in black glass), the slurry cures through chemical reactions at lower temperatures, forming strong bonds without the temperature instability associated with black glass's high heat emission properties
3Ease of manufacture
If transparent outer layer is added to black glass for welding, then hot working becomes possible, but process complexity increases
Solution Approach 1:
The invention extracts the bonding function from the complex multi-step process of adding transparent outer layers and performs bonding directly on the black glass surface using silane-modified slurry. This eliminates the need for additional layer deposition, vitrification, and carbon content control steps, significantly simplifying the manufacturing process while maintaining processability
4Strength
If slurry mass is applied to connecting surfaces, then bonding is achieved, but drying time increases for large-area connections
Solution Approach 1:
The invention changes the slurry composition by adding silane groups, which enables the bonding mechanism to shift from primarily physical drying to chemical curing. This allows the slurry to develop bonding strength through chemical reactions at lower temperatures and shorter times, dramatically reducing the time required for large-area connections compared to traditional drying processes
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 a mechanically and thermally stable composite body with a high silicic acid content, facilitating large-area bonding connections while maintaining dimensional accuracy and reducing defects.
Implementation Method 1
heating the composite-body intermediate product while forming the composite body
Implementation Method 2
followed by vitrification under vacuum
Data Source
AI summary
A low cost method for producing a mechanically and thermally stable composite body containing a first layer of a material with a high silicic acid content and an additional component connected to a second layer of a material with a high silicic acid content and an additional component in a second concentration differing from the first concentration is provided. The method involves (a) preparing a first slurry layer having a free surface using a first shirt mass containing SiO2 particles and an additional component dispersed in a first dispersing agent, (b) providing a second slurry mass containing SiO2 particles and an additional component in a second concentration dispersed in a second dispersing agent, (c) forming a composite-body intermediate product by applying the second slurry mass to the free surface of the first slurry layer, and (d) heating the composite-body intermediate product while forming the composite body.