Vacuum Glass Panel Getter Composition for Low-Temperature Activation
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Solution Overview
Problem
Existing glass panel units face challenges in achieving sufficient gas adsorption performance in low-pressure ranges during manufacturing at lower temperatures, particularly with zeolite-based materials, as they require high activation temperatures to desorb gases effectively.
Innovation Solution
Incorporating a getter material with zeolite crystals having a particle size of at least 200 nm and an activatable temperature below 400°C, along with a hydrogenation catalyst, to enhance gas adsorption capability in evacuated spaces, allowing for effective gas desorption at lower temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If zeolite-based gas adsorbent is used in glass panel unit, then gas adsorption capability is improved, but activation temperature becomes too high making manufacturing difficult
Solution Approach 1:
The patent changes the particle size parameter of zeolite to 200 nm or larger, which fundamentally alters the activation temperature characteristic. This parameter change enables the zeolite to achieve effective gas adsorption capability while requiring lower activation temperatures compatible with manufacturing processes, thus resolving the contradiction between adsorption performance and manufacturing feasibility.
2Productivity
If manufacturing process is performed at lower temperatures, then manufacturing cost and energy consumption are reduced, but gas adsorption performance becomes insufficient
Solution Approach 1:
By changing the particle size parameter to 200 nm or larger, the zeolite maintains high gas adsorption performance even at lower manufacturing temperatures. This parameter modification breaks the traditional trade-off between manufacturing temperature and adsorption performance, allowing low-temperature manufacturing without sacrificing reliability.
3Reliability
If smaller zeolite particles are used, then gas adsorption surface area is increased, but activation temperature requirement increases making process difficult
Solution Approach 1:
The patent identifies 200 nm as a critical parameter threshold that simultaneously provides sufficient surface area for gas adsorption while keeping activation temperature at acceptable levels. This specific parameter value resolves the contradiction by finding the optimal balance point where both adsorption capability and manufacturing feasibility are achieved.
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 solution enables powerful gas adsorption performance in low-pressure ranges, reducing residual gases and maintaining thermal insulation properties, even when manufactured at lower temperatures, thus improving manufacturing efficiency and cost-effectiveness.
Implementation Method 1
The gas adsorbent contains a getter material. The getter material contains a plurality of particles of a zeolite crystal
Implementation Method 2
An activable temperature of the at least one particle is equal to or lower than 400° C.
Data Source
AI summary
A glass panel unit includes: a first glass pane; a second glass pane facing the first glass pane; a frame member; an evacuated space; and a gas adsorbent. The frame member hermetically bonds the first glass pane and the second glass pane. The evacuated space is surrounded with the first glass pane, the second glass pane, and the frame member. The gas adsorbent is placed in the evacuated space. The gas adsorbent contains a getter material. The getter material contains a plurality of particles of a zeolite crystal. At least one particle accounting for a half or more of a total weight of the plurality of particles has a particle size equal to or greater than 200 nm. An activable temperature of the at least one particle is equal to or lower than 400° C.