Composite Casting Compound for Gastight Glass Channel Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current channel systems for glass production face issues with gas permeability, mechanical durability, and complexity due to the use of ceramic and metallic materials, leading to shortened component lifetimes and poor glass quality from bubble formation and extraneous ceramic particles.
Innovation Solution
A casting compound formulation comprising a base slip with ultrafine SiO2 particles, quartz glass particles, and a multicomponent glass, which forms a sintered SiO2 matrix with a cristobalite structure and glassy phases, providing a gastight and dimensionally stable external structure for channel systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ceramic casting compounds are used for external structure, then mechanical stabilization is sufficient, but gas permeation through metal walls cannot be avoided due to porous structure and sintering shrinkage
Solution Approach 1:
The patent changes the physical and chemical parameters of the casting compound by incorporating specific glass components (borosilicate glass, aluminosilicate glass) that react with the sintered SiO2 matrix to form a chemically bonded, non-porous composite material. This transformation eliminates the porous structure inherent in conventional ceramic castings, preventing gas permeation while maintaining mechanical strength.
Solution Approach 2:
The invention creates a composite material combining sintered SiO2 matrix with glass phases (borosilicate glass, aluminosilicate glass) to achieve both mechanical stability and gas tightness. The composite structure leverages the high strength of sintered SiO2 and the sealing properties of glass phases, eliminating the need for porous ceramic structures.
2Reliability
If controlled feeding of gases into gaps is used to suppress gas exchange, then gas exchange is suppressed, but overall complexity for construction and reliable operation becomes very high
Solution Approach 1:
The casting compound autonomously prevents gas exchange through its inherent non-porous, chemically bonded structure. The glass phases react with the sintered SiO2 matrix to create a self-sealing composite that passively blocks gas permeation without requiring external gas feeding systems or active control mechanisms.
Solution Approach 2:
The invention extracts and eliminates the need for complex gas control systems by designing a casting compound that intrinsically prevents gas exchange. The harmful porous structure and associated gas feeding requirements are removed entirely, replaced by a dense, chemically bonded composite material.
3Reliability
If precious metal channels are used, then chemical inertness is achieved, but mechanical durability is very low at high operating temperatures
Solution Approach 1:
The patent employs a composite material consisting of sintered SiO2 matrix reinforced with glass phases, creating a ceramic-composite structure that combines the chemical inertness of ceramic materials with enhanced mechanical strength. This composite provides both the required chemical resistance to glass melts and the mechanical durability needed for high-temperature operation.
Solution Approach 2:
The invention changes the material parameters by using sintered SiO2 with specific crystal structures (cristobalite, tridymite) and incorporating glass phases that enhance mechanical properties while maintaining chemical inertness. The controlled sintering process and glass composition selection optimize both strength and chemical resistance.
4Stability of the object's composition
If external structure compensates for thermal expansion of metal channels, then expansion compensation is achieved, but gap formation due to different coefficients of thermal expansion leads to gas exchange
Solution Approach 1:
The patent addresses thermal expansion by changing the material composition to include glass phases with specific thermal expansion coefficients that match or complement the metal channels. The sintered SiO2 matrix and glass phases are selected to minimize differential thermal expansion, preventing gap formation while maintaining dimensional stability.
Solution Approach 2:
The invention utilizes thermal expansion principles by selecting glass components (borosilicate glass, aluminosilicate glass) with controlled expansion characteristics. These glass phases are integrated into the sintered SiO2 matrix to create a composite that expands harmoniously with metal channels, eliminating gaps that would otherwise form during thermal cycling.
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 composite material prevents gas exchange, enhances mechanical stability, and allows for continuous glass production without adverse effects on quality, even with vertical elements, and can be cooled without damage, offering improved durability and operational simplicity.
Implementation Method 1
there is usually further sintering at the high operating temperatures. The sintering shrinkage that occurs in the course of the sintering process
Implementation Method 2
The glassy phases are enriched here in the region of the metallic component. Thus, the outer shell surfaces of the metallic component are covered by a thin glass film.
Data Source
AI summary
A formulation for a casting compound is provided that includes a base slip with a proportion between 18% and 36% by weight, quartz glass particles with a proportion between 40% and 70% by weight, and particles of an admixture having at least one multicomponent glass with a proportion between 10% and 40% by weight. The base slip contains water as dispersion medium with a content between 30% and 50% by weight and ultrafine Si0 2 particles colloidally distributed therein with a content between 50% and 70% by weight, and wherein the total water content in the formulation is 10% to 20% by weight. A composite material is also provided that has a largely crystalline Si0 2 matrix and particles of a multicomponent glass embedded therein.