Coil Component with Curie Temperature Gradient Ferrite
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Solution Overview
Problem
Inductors face challenges in miniaturization and high current characteristics, and their magnetic properties are affected by temperature changes, leading to instability in high-temperature environments, which affects their reliability.
Innovation Solution
A coil electronic component with a body containing ferrite and a magnetic permeability adjusting layer made of Ni—Zn—Cu-based ferrite, where the ferrite in the adjusting layer has a lower Curie temperature than the body ferrite, providing higher magnetic permeability at room temperature and acting as a magnetic gap at higher temperatures to stabilize the component's characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If ferrite with high Curie temperature is used in the body to maintain magnetic properties at high temperature, then high temperature stability is improved, but magnetic permeability at room temperature decreases
Solution Approach 1:
The ferrite core is segmented into two distinct regions: a body portion with high Curie temperature ferrite and a magnetic permeability adjusting layer with low Curie temperature ferrite. This segmentation allows each region to perform its specific function - the body provides high temperature stability while the adjusting layer optimizes room temperature magnetic permeability.
Solution Approach 2:
Different regions of the ferrite core are assigned different material properties. The body portion uses ferrite with high Curie temperature (150-200°C) for thermal stability, while the magnetic permeability adjusting layer uses ferrite with low Curie temperature (80-120°C) and higher Zn content to provide higher magnetic permeability at room temperature. This local differentiation resolves the contradiction between room temperature performance and high temperature stability.
2Reliability
If the Curie temperature of ferrite is increased to improve high temperature characteristics, then high temperature reliability is improved, but magnetic permeability at operating temperature decreases
Solution Approach 1:
The ferrite core is constructed as a composite structure combining two types of ferrite materials with different Curie temperatures and compositions. The body uses Ni-Zn-Cu-based ferrite with high Curie temperature, while the adjusting layer uses Ni-Zn-Cu-based ferrite with lower Curie temperature and higher Zn content. This composite approach allows the system to achieve both high temperature reliability and adequate magnetic permeability at operating temperatures.
3Reliability
If ferrite composition is optimized for high magnetic permeability at room temperature, then room temperature performance is improved, but stability at high temperature deteriorates
Solution Approach 1:
The ferrite core is divided into functional segments: the body portion optimized for high temperature stability and the magnetic permeability adjusting layer optimized for room temperature performance. This segmentation enables independent optimization of each region's composition and properties without compromising the other.
Solution Approach 2:
The magnetic permeability adjusting layer is positioned specifically where high magnetic permeability is needed at room temperature, while the body maintains high Curie temperature ferrite for thermal stability. This local quality differentiation allows the system to achieve both room temperature performance and high temperature stability simultaneously.
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 component maintains stable magnetic characteristics across a wider temperature range, preventing rapid changes in permeability and inductance, ensuring reliable operation even in high-temperature conditions.
Implementation Method 1
a magnetic permeability adjusting layer disposed in the body and including ferrite having a Curie temperature lower than that of the ferrite included in the body
Data Source
AI summary
A coil electronic component includes a body including ferrite, a coil portion embedded in the body, external electrodes electrically connected to the coil portion, and a magnetic permeability adjusting layer disposed in the body and including ferrite having a Curie temperature lower than that of the ferrite included in the body.