Nanocrystalline Magnetic Shielding With Two-Stage Magnet Cracking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing nanocrystalline magnetic-isolation shielding materials fail to maintain stable performance in high-temperature environments, such as those experienced by electronic products like e-cigarettes and drones, due to deformation, bulging, and fluctuations in inductance and resistance, which affect sensor accuracy and operational stability.
Innovation Solution
A heat-resistant nanocrystalline magnetic-isolation shielding material is prepared by coating a nanocrystalline soft magnetic alloy ribbon with a double-sided adhesive tape, followed by primary and secondary magnet cracking treatments and stress relief treatments to optimize the nanocrystalline fragment structure, reducing stress effects and eddy current losses.
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 becomes deformed and bulged at high temperatures, causing large fluctuations in inductance and resistance
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive from ordinary acrylic adhesive to high-temperature resistant adhesive containing heat-resistant resin (50-80 parts), silane coupling agent (5-15 parts), and other components. This parameter change enables the adhesive to maintain stability at temperatures above 200°C while preserving bonding functionality.
Solution Approach 2:
The patent creates a composite adhesive system by combining heat-resistant resin, silane coupling agent, and other additives in specific proportions. This composite material approach provides both high-temperature resistance and good bonding performance, resolving the contradiction between ease of manufacture and reliability.
2Object-affected harmful factors
If the adhesive layer is made thicker to ensure complete filling of cracks and insulation, then insulation effect is improved, but the adhesive layer becomes more unstable at high temperatures
Solution Approach 1:
The patent optimizes the adhesive layer thickness parameter to 5-20 μm, which is sufficiently thin to maintain high-temperature stability but sufficiently thick to fill cracks and provide insulation. The improved adhesive composition enables this thin layer to achieve both insulation and thermal stability.
Solution Approach 2:
The patent uses a thin adhesive layer that can be applied as a coating rather than a thick structural layer. This thin layer performs its insulation and bonding function effectively without the high-temperature instability problems associated with thicker adhesive layers.
3Reliability
If nanocrystalline ribbon is heat-treated to improve magnetic properties, then magnetic performance is enhanced, but the ribbon becomes very brittle and fragile, making continuous mass production difficult
Solution Approach 1:
The patent performs stress relief treatment on the nanocrystalline ribbon before it becomes brittle from heat treatment. This preliminary action of stress relief prevents subsequent brittleness and cracking during handling and assembly, enabling continuous mass production while maintaining enhanced magnetic properties.
Solution Approach 2:
The patent applies stress relief treatment as a cushioning measure before the ribbon undergoes heat treatment that would make it brittle. This beforehand cushioning prevents damage during subsequent processing steps, resolving the contradiction between magnetic performance enhancement and production continuity.
4Object-affected harmful factors
If existing magnetic shielding materials are used in high-frequency environments, then electromagnetic shielding is provided, but inductance and resistance fluctuate significantly, affecting sensor accuracy and flight status
Solution Approach 1:
The patent changes multiple parameters including adhesive composition (heat-resistant formula), adhesive layer thickness (5-20 μm), and incorporates stress relief treatment. These parameter changes ensure that inductance and resistance remain stable in high-frequency environments, maintaining both electromagnetic shielding and sensor accuracy.
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 material maintains stable magnetic properties at high temperatures, reducing performance fluctuations and eddy current losses, suitable for MHz-level frequencies and high-temperature environments, enabling continuous large-scale production.
Implementation Method 1
The heat-resistant nanocrystalline magnetic-isolation shielding material is obtained by coating a nanocrystalline soft magnetic alloy ribbon
Implementation Method 2
nanocrystalline soft magnetic alloy ribbon
Implementation Method 3
followed by primary and secondary magnet cracking treatments
Implementation Method 4
followed by primary and secondary magnet cracking treatments and stress relief treatments
Implementation Method 5
coating a nanocrystalline soft magnetic alloy ribbon with a double-sided adhesive tape
Data Source
Figure 1~3
Figure 4~5
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 comprises 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. The preparation method of the heat-resistant nanocrystalline magnetic-isolation shielding material provided by the present application creatively adopts a process of two-stage magnet cracking treatment in combination with stress relief treatment and uses a specific double-sided adhesive tape, and thus the prepared magnetic-isolation shielding material has better thermal stability.