Flash Lamp Glass Composition for Stable Electrode Seals
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Solution Overview
Problem
The stability of the fuse between the electrode and the glass tube in flash lamps is compromised due to extreme and rapid temperature changes, leading to reduced lifespan.
Innovation Solution
A glass with a coefficient of thermal expansion of 4.5 ppm/K or less and a T4 temperature of 1500 °C or more, along with a water content of at least 35 mmol/l, is developed to improve the thermal stability and sealing properties, reducing reboil propensity and enhancing the durability of flash lamps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional glass materials are used in flash lamps, then the manufacturing process is simple, but the fuse between electrode and glass tube becomes unstable under extreme temperature changes
Solution Approach 1:
The patent modifies the glass composition parameters specifically by adding water content (at least 35 mmol/l) and controlling the coefficient of thermal expansion (4.5 ppm/K or less) and T4 temperature (1500°C or more). These parameter changes enable the glass to maintain seal stability under extreme temperature fluctuations without complicating the overall manufacturing process
Solution Approach 2:
The invention creates a composite glass material that combines specific oxides (SiO2, B2O3, Al2O3, BeO) with controlled water content. This composite composition achieves both the required thermal expansion properties and high T4 temperature, resolving the contradiction between reliability and complexity
2Stability of the object's composition
If glass with low coefficient of thermal expansion is used, then thermal stability improves, but manufacturing precision becomes more difficult to achieve
Solution Approach 1:
The patent achieves thermal stability by precisely controlling composition parameters (water content ≥35 mmol/l, CTE ≤4.5 ppm/K, T4 ≥1500°C) while maintaining manufacturability through a straightforward melting and forming process. The specific parameter ranges enable both thermal stability and manufacturing precision
3Reliability
If high T4 temperature glass is used, then seal stability under temperature changes improves, but the manufacturing process becomes more complex
Solution Approach 1:
The patent achieves high T4 temperature (≥1500°C) through specific composition control (high SiO2 content, controlled B2O3 and Al2O3) while maintaining ease of manufacture. The glass can be formed using conventional melting and forming techniques, and the water content adjustment occurs naturally during the melting process, making the high-performance glass as easy to manufacture as conventional glass
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 glass composition significantly improves the stability and lifespan of flash lamps by maintaining a stable seal under extreme temperature fluctuations, as evidenced by a reboil propensity score of less than 10 in the reboil propensity test.
Implementation Method 1
a coefficient of thermal expansion in the temperature range from 20 °C to 300 °C of 4.5 ppm/K or less
Implementation Method 2
a T4 temperature, defined as the temperature at which the glass has a viscosity of 10 4 Pa s, of 1500 °C or more
Data Source
Figure 1
Figure 2A~2B
Figure 2C~2D
AI summary
The present invention relates to glass, glass articles, methods of making the glass, use of the glass and flash lamps comprising the glass. The glass according to the invention is particularly suitable for flash lamps comprising the glass.