High-Z Conformal Coating for Lightweight PCB Radiation Shielding
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Solution Overview
Problem
Existing radiation shielding methods for electronics, such as forming sheet metal shields, pose challenges including manufacturability, cost, weight, assembly complexity, and mass penalties, especially in aerospace and satellite applications where size and mass are critical.
Innovation Solution
A method involving the fabrication of a circuit card assembly with a grounding region connected to a chassis ground, and applying a conformal coat of polymeric composition metallized with high-Z materials, such as tungsten or tantalum, to provide effective radiation shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sheet metal shields are used for radiation shielding, then radiation protection is provided, but weight and mass increase significantly
Solution Approach 1:
The patent changes the material parameter from traditional sheet metal to a polymeric composition metallized with high-Z materials. This parameter change maintains radiation shielding effectiveness while significantly reducing weight, as polymers are much lighter than metals while the high-Z material provides the necessary radiation attenuation.
Solution Approach 2:
The patent employs a composite material system consisting of a polymeric base material combined with metallized high-Z materials. This composite approach allows the polymer to provide structural integrity and light weight while the metallized high-Z layers provide radiation shielding, achieving both weight reduction and effective protection.
2Object-affected harmful factors
If sheet metal shields are used for radiation shielding, then radiation protection is provided, but assembly complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges the radiation shielding function with the conformal coating process. By metallizing the polymeric composition and applying it as a conformal coat, the shielding becomes an integrated part of the circuit board assembly process rather than a separate component requiring additional assembly steps, thereby reducing overall assembly complexity.
Solution Approach 2:
The patent uses a flexible polymeric conformal coating that can be applied as a thin film over the circuit board surface. This flexible coating approach eliminates the need for rigid sheet metal shields and complex mechanical mounting structures, simplifying both manufacturing and assembly while providing effective radiation protection.
3Object-affected harmful factors
If global enclosure shielding is implemented, then comprehensive radiation protection is achieved, but cost and manufacturing complexity increase
Solution Approach 1:
The patent applies radiation shielding selectively to specific areas of the circuit board where electronic components are located, rather than providing global enclosure shielding. The conformal coat can be applied only to regions requiring protection, reducing material usage and manufacturing complexity while maintaining effective shielding where needed.
Solution Approach 2:
The polymeric conformal coating serves multiple functions simultaneously: it provides radiation shielding through metallized high-Z materials, offers environmental protection, and maintains electrical insulation. This multi-functionality eliminates the need for separate shielding components and simplifies the overall manufacturing process.
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
This approach provides targeted radiation protection for electronics, reducing assembly complexity and mass penalties while maintaining effective radiation shielding, thus optimizing performance and cost in critical applications.
Implementation Method 1
forming a polymeric composition metallized with a high-Z material, wherein the high-Z material is effective to provide radiation shielding
Implementation Method 2
the high-Z material is effective to provide radiation shielding for the circuit card assembly
Data Source
AI summary
A method and device for providing radiation shielding is disclosed. The method comprises fabricating a circuit card assembly that includes a grounding region configured to prevent a floating metal, wherein the grounding region is connected to a chassis ground. The method further comprises forming a polymeric composition metallized with a high-Z material, wherein the high-Z material is effective to provide radiation shielding for the circuit card assembly. The method also comprises applying a conformal coat of the polymeric composition metallized with the high-Z material over the circuit card assembly including the grounding region. The conformal coat is effective to provide radiation protection for the circuit card assembly when exposed to an ionizing radiation environment.