Ni-Zn-Cu Ferrite Composition for DC Superimposition and Temperature Stability
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Solution Overview
Problem
Existing Ni-Zn-Cu-based ferrite materials excel in either DC superimposition or temperature characteristics but not both, especially when exposed to large AC magnetic fields, and often require additional compounds like silicon oxide, bismuth oxide, or chromium oxide, which are not always necessary or effective.
Innovation Solution
A Ni-Zn-Cu-based ferrite composition comprising 70-95% Ni-Zn-Cu ferrite, 1-20% nickel oxide, and 1-10% copper oxide, with specific mol% ratios of Fe2O3, NiO, ZnO, and CuO, which maintains excellent temperature and DC superimposition characteristics without additional compounds, achieving a balanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Ni-Zn-Cu-based ferrite is used to improve DC superimposition characteristic, then magnetic permeability is maintained under DC bias, but temperature characteristic deteriorates due to high temperature rise
Solution Approach 1:
The patent applies parameter changes by precisely controlling the compositional ratios of Fe2O3 (35-45 mol%), NiO (10-20 mol%), ZnO (30-40 mol%), and CuO (6-15 mol%) in the ferrite material. This compositional optimization enables the material to maintain excellent DC superimposition characteristic while simultaneously improving temperature characteristic, resolving the contradiction between DC performance and temperature stability without requiring additional additives.
2Measurement precision
If large AC magnetic field is applied to test DC superimposition characteristic, then accurate DC performance is evaluated, but core loss increases significantly
Solution Approach 1:
The patent employs parameter changes by optimizing the ferrite composition within specific ranges (Fe2O3: 35-45 mol%, NiO: 10-20 mol%, ZnO: 30-40 mol%, CuO: 6-15 mol%) to achieve a balance between DC superimposition characteristic and core loss. This compositional control allows the material to exhibit excellent DC performance even when evaluated under large AC magnetic fields, while simultaneously maintaining acceptable core loss levels.
Data Source
AI summary
An object of the present invention is to provide a ferrite material that is excellent in temperature characteristic and DC superimposition characteristic. The present invention relates to Ni-Zn-Cu-based ferrite particles comprising 70 to 95% by weight of an Ni-Zn-Cu ferrite having a specific composition, 1 to 20% by weight of nickel oxide, 0 to 20% by weight of zinc oxide and 1 to 10% by weight of copper oxide, and a ferrite sintered ceramics obtained by sintering the ferrite particles.