Tellurate Glass Joining at 420°C
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Solution Overview
Problem
Current methods for producing vacuum insulating glass panes require high joining temperatures, often exceeding 420 °C, which is problematic due to the use of high lead-containing glasses that are environmentally unsuitable and bismuth-containing glasses that are crystallization-sensitive, and are impaired by the addition of filling agents affecting flow properties and wettability.
Innovation Solution
A lead-free glass composition comprising V2O5, TeO2, and at least one oxide selected from ZnO, Al2O3, or MoO3, with a thermal expansion coefficient of 7.0-8.5 × 10^-6 K, allowing joining at ≤420 °C, and a glass paste processed using polypropylene carbonate as a binding agent for application and firing at lower temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high lead-containing glasses are used for joining glass panes, then the joining temperature can be reduced, but the environmental suitability deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the glass by introducing specific oxide combinations (V2O5, TeO2, ZnO, Al2O3, MoO3) to achieve low-temperature joining properties without using lead, thus resolving the contradiction between low joining temperature and environmental suitability
Solution Approach 2:
The patent creates a composite glass system combining multiple oxide components (V2O5, TeO2, ZnO, Al2O3, MoO3) that work synergistically to provide both low-temperature joining capability and environmental compatibility, replacing the single-component lead glass approach
2Temperature
If bismuth-containing glasses are used for joining, then the joining temperature can be reduced, but the crystallization resistance deteriorates
Solution Approach 1:
The patent modifies the glass composition by incorporating TeO2 and specific ratios of V2O5 with ZnO/Al2O3/MoO3 to suppress crystallization while maintaining low softening temperature, achieving both low-temperature joining and compositional stability without bismuth
3Stability of the object's composition
If filling agents are added to glass compositions, then the thermal expansion coefficient can be adjusted, but the flow properties and wettability deteriorate
Solution Approach 1:
The patent optimizes the base glass composition with specific ratios of V2O5, TeO2, ZnO, Al2O3, and MoO3 to maintain excellent flow properties and wettability while having the capacity to add filling agents for thermal expansion adjustment without suffering the typical deterioration in flow characteristics
4Reliability
If high joining temperatures are used, then the chemical resistance of the seal can be improved, but the thermal stress on the glass panes increases
Solution Approach 1:
The patent changes the joining temperature parameter from high (conventional) to low (≤420°C) while compensating for potential chemical resistance issues through the optimized glass composition containing V2O5, TeO2, ZnO, Al2O3, and MoO3, which provide adequate chemical resistance at lower processing temperatures
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 joining of glass panes at temperatures ≤420 °C with improved chemical resistance, moisture resistance, and compatibility with standard solvents, allowing for the production of vacuum insulating glass with reduced thermal stress and the ability to process coated glasses without damage, while maintaining hermetic seals and industrial feasibility.
Implementation Method 1
glasses having particularly low softening temperatures
Implementation Method 2
firing to lower temperatures
Implementation Method 3
a glass paste processed using polypropylene carbonate as a binding agent for application and firing at lower temperatures
Implementation Method 4
with a thermal expansion coefficient of 7.0-8.5 × 10^-6 K, allowing joining at ≤420 °C, and a glass paste processed using polypropylene carbonate as a binding agent for application and firing at lower temperatures
Data Source
Figure 1
AI summary
The present invention relates to a glass, in particular a glass for the joining of glass panes for the production of vacuum insulating glasses at processing temperatures≤ 420 °C, to the corresponding composite glass, and to the corresponding glass paste. Moreover, the present invention relates to a vacuum insulating glass produced using the glass paste according to the invention, to the production process thereof, and to the use of the inventive glass and/or composite glass, and glass paste.The glass according to the invention is characterized in that it comprises the following components, in units of mol-%: V2O5 5-58 mol-%,TeO2 40-90 mol-%, and at least one oxide selected from ZnO 38-52 mol-%, or Al2O3 1 -25 mol%, or MOO3 1 -10 mol-%, or WO3 1 -10 mol-%, or a combination thereof.