Nanocrystalline Magnetic Shielding for High-Temperature Stability
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Solution Overview
Problem
Existing magnetic-isolation shielding materials fail to maintain stability and performance at high temperatures, especially in environments above 200°C, such as in e-cigarettes and drones, due to deformation and fluctuations in inductance and resistance, which affects the reliability and accuracy of electronic devices.
Innovation Solution
A heat-resistant nanocrystalline magnetic-isolation shielding material is developed by coating a nanocrystalline soft magnetic alloy ribbon with an ultra-thin double-sided adhesive tape, followed by primary and secondary magnet cracking treatments and stress relief processes, optimizing the nanocrystalline fragment structure and reducing adhesive tape fluctuations for improved thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If ordinary acrylic adhesive is used to bond nanocrystalline shielding materials, then the material can be easily processed and assembled, but the adhesive layer deforms and bulges at temperatures above 90°C to 120°C, causing large fluctuations in inductance and resistance
Solution Approach 1:
The patent changes the key parameter of adhesive temperature resistance from 90-120°C to above 200°C by selecting high-temperature resistant adhesive materials, enabling the shielding material to maintain stable inductance and resistance values in high-temperature environments while preserving ease of processing
Solution Approach 2:
The patent creates a composite structure combining nanocrystalline shielding material with high-temperature resistant adhesive and protective film, where each layer compensates for the limitations of others, achieving both ease of manufacture and high-temperature reliability
2Strength
If the adhesive layer thickness is increased to improve bonding strength, then the bonding between layers is enhanced, but the performance becomes more unstable in high-temperature environments
Solution Approach 1:
The patent changes the quality parameter of adhesive from ordinary acrylic to high-temperature resistant adhesive, allowing the use of thinner adhesive layers (reducing thickness while maintaining or improving bonding strength) that do not deform at high temperatures, thus improving both strength and reliability
3Length of moving object
If nanocrystalline shielding materials are used to achieve thin thickness and low loss, then the shielding performance is improved, but the materials deform and bulge in high-temperature environments above 200°C, affecting sensor accuracy and flight status
Solution Approach 1:
The patent constructs a multi-layer composite structure where nanocrystalline shielding material is bonded with high-temperature resistant adhesive and protective film, creating a composite system that maintains the thin thickness and low loss properties of nanocrystalline material while adding high-temperature dimensional stability
Solution Approach 2:
The patent applies protective film and high-temperature resistant adhesive layers beforehand to cushion and protect the nanocrystalline shielding material from thermal deformation, preventing bulging and maintaining dimensional stability in high-temperature environments
4Reliability
If traditional nanocrystalline shielding sheet technology is used, then the material provides good magnetic shielding, but it cannot guarantee performance stability at MHz frequencies and temperatures above 200°C
Solution Approach 1:
The patent optimizes multiple parameters including nanocrystalline ribbon composition, adhesive temperature resistance, and layer structure to enable the shielding material to maintain effective magnetic shielding performance at MHz frequencies and temperatures above 200°C, expanding the applicable frequency and temperature ranges
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 resulting material exhibits stable magnetic properties at high temperatures, reducing eddy current losses and maintaining performance without appearance defects, suitable for industrial production and applications in high-temperature environments like e-cigarettes and drones.
Implementation Method 1
The nanocrystalline soft magnetic alloy ribbon is obtained by heat-treating an amorphous soft magnetic alloy ribbon
Implementation Method 2
heat-treating an amorphous soft magnetic alloy ribbon to obtain a nanocrystalline soft magnetic alloy ribbon
Implementation Method 3
performing primary magnet cracking treatment on the adhesive-coated nanocrystalline ribbon to obtain a single-layered nanocrystalline magnetic layer
Data Source
AI summary
The present application relates to the technical field of electromagnetic-isolation shielding materials, and in particular to a heat-resistant nanocrystalline magnetic-isolation shielding material and a preparation method and application thereof. The preparation method includes the following steps: S1, applying a double-sided adhesive tape onto a nanocrystalline soft-magnetic alloy ribbon to prepare a adhesive-coated nanocrystalline ribbon; S2, performing primary magnet cracking treatment on the adhesive-coated nanocrystalline ribbon to obtain a single-layered nanocrystalline magnetic layer; S3, performing multi-layer combination on the single-layered nanocrystalline magnetic layer to obtain a composite, and performing stress relief treatment on the composite to obtain a multi-layered nanocrystalline magnetic layer; and S4: performing secondary magnet cracking treatment on the multi-layered nanocrystalline magnetic layer to obtain a heat-resistant nanocrystalline magnetic-isolation shielding material.