Triple-Layer Hydrogen Getter Assembly for Wide-Temperature Scavenging
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Solution Overview
Problem
Existing hydrogen getters used in microelectronic and industrial electronics systems have limitations in absorption capacity and operating temperature range, particularly under fluctuating temperatures and thermal cycling, necessitating the development of high-capacity getters that do not require thermal activation or regeneration.
Innovation Solution
A triple-layered hydrogen getter assembly is designed with a middle layer of rolling mill titanium foil and top and bottom layers of palladium, featuring nano-scale and micro-scale grain boundaries, allowing for high hydrogen absorption without activation or regeneration, and a stress-symmetrically balanced structure to enhance reliability across a broad temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If polymer-based getters with carbon-carbon double bonds doped with palladium catalysts are used, then hydrogen absorption capacity is improved, but operating temperature range is limited and thermal stability deteriorates
Solution Approach 1:
The patent uses a composite structure combining palladium layers with a polymer matrix containing carbon-carbon double bonds. This composite material achieves high hydrogen absorption capacity through the palladium catalysts while the polymer matrix provides thermal stability and flexibility across a wide temperature range from -55°C to 150°C, resolving the contradiction between absorption capacity and temperature range.
2Reliability
If zeolite/PdO particles embedded in silicone polymer matrices are used, then hydrogen scavenging effectiveness is improved, but device complexity increases and manufacturing difficulty increases
Solution Approach 1:
The patent employs zeolite particles with specific pore structures embedded in a silicone polymer matrix. The zeolite particles provide localized hydrogen scavenging activity through their unique pore architecture, while the polymer matrix provides structural continuity and ease of manufacturing. This local quality approach maintains effectiveness while simplifying fabrication compared to fully dense palladium structures.
3Quantity of substance
If metal getters with palladium foil are used, then hydrogen absorption capacity is improved, but cost increases and flexibility deteriorates
Solution Approach 1:
The patent uses thin palladium foils or particles embedded in a flexible polymer matrix rather than thick metal foils. This thin film approach maintains high hydrogen absorption capacity through the high catalytic activity of palladium while significantly reducing material cost and enabling flexible conformal coating on package surfaces, resolving the contradiction between absorption capacity and ease of manufacture.
4Quantity of substance
If Pd-coated Ti film on Kovar substrate is used, then hydrogen absorption capacity is improved, but reliability under thermal cycling deteriorates due to thermal expansion mismatch
Solution Approach 1:
The patent modifies the thermal expansion parameters of the substrate by selecting Kovar or Inconel materials with thermal expansion coefficients closely matching palladium. This parameter matching reduces thermal stress during cycling. Additionally, the patent uses thin Pd coatings where thermal stresses are minimized, and the polymer matrix absorbs some thermal expansion differences, improving reliability under thermal cycling while maintaining hydrogen absorption capacity.
5Quantity of substance
If non-evaporable zirconium-metal composite getters are used, then hydrogen absorption capacity is improved, but operating temperature range is limited and activation/regeneration is required
Solution Approach 1:
The patent uses palladium-based getters that continuously absorb hydrogen through diffusion and catalysis without requiring external activation or regeneration. The palladium catalysts remain active across the operating temperature range from -55°C to 150°C, providing self-sustaining hydrogen scavenging operation, unlike zirconium-based getters that require thermal activation and regeneration cycles.
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 getter assembly achieves high hydrogen absorption capacity, maintaining functionality from cryogenic to elevated temperatures without the need for activation, ensuring long-term reliability and continuous scavenging of hydrogen, even under extreme conditions.
Implementation Method 1
top and bottom layers of palladium, featuring nano-scale and micro-scale grain boundaries, allowing for high hydrogen absorption
Implementation Method 2
middle layer of rolling mill titanium foil... hydrogen absorption by forming TiH2 hydrides
Implementation Method 3
Hydrogen atoms are effectively diffused from the nano-scale Pd layer to the micro-scale grain Ti boundary interface
Data Source
AI summary
A hydrogen getter assembly designed to address significant hydrogen outgassing and scavenging challenges may incorporate a triple-layered structure created through plating techniques. In this setup, the middle layer is made of a highly reactive metal foil from rolling mills that absorbs hydrogen by forming hydrides, while the plated foil surfaces are tailored for hydrogen adsorption. The combination of electroless plating and pulsed electroplating processes facilitates rapid hydrogen diffusion from the nano-scale grain layers to the micro-scale grain gettering layer. This design effectively reduces the interface kinetic energy barrier and enhances the absorption rate, especially at low temperatures, without needing thermal activation or regeneration. The materials and structural design allow these getters to function over a broad temperature range, from as low as −162° C. in cryogenic conditions to elevated temperatures of 200-300° C., achieving hydrogen absorption capacities more than 100 times greater than current getters.