MnZn Ferrite Composition for Wide-Temperature Low Power Loss
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Solution Overview
Problem
MnZn ferrite materials face challenges in maintaining low power consumption across a wide temperature range of 25° C. to 140° C., particularly in scenarios like new energy vehicle chargers and outdoor equipment, where traditional materials show unsatisfactory performance due to high consumption at both high and low temperatures.
Innovation Solution
A MnZn ferrite material is developed with optimized principal and auxiliary components, including Fe2O3, ZnO, MnO, Co2O3, CaSiO3, Nb2O5, TiO2, and RE elements, where pre-sintered materials under different conditions are mixed to inhibit grain growth, improving structural uniformity and reducing porosity, thereby controlling power consumption and magnetic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If traditional wide-temperature-range MnZn ferrite materials are used, then low power consumption is achieved in specific temperature ranges, but unsatisfactory consumption performance occurs in other temperature ranges (particularly 25°C to 100°C)
Solution Approach 1:
The patent applies parameter changes by precisely adjusting the chemical composition parameters of the MnZn ferrite material. Specifically, it controls Fe2O3 content at 52.5-53.8 mol%, ZnO at 8.8-12 mol%, and adds auxiliary components (Co2O3: 0.35-0.5 wt%, CaSiO3: 0.03-0.08 wt%, Nb2O5: 0.01-0.04 wt%, TiO2: 0.05-0.12 wt%, and RE elements: 0.01-0.06 wt%) to optimize magnetic properties across the temperature range. The patent also changes processing parameters by mixing pre-sintered materials from different sintering conditions and controlling sintering temperature (1260-1300°C) and time (4-8 hours) to achieve consistent low power consumption from 25°C to 140°C.
Solution Approach 2:
The patent creates a composite material system by combining MnZn ferrite with multiple auxiliary components including Co2O3, CaSiO3, Nb2O5, TiO2, and rare earth elements. This composite approach allows different components to contribute specific functions: Co2O3 enhances magnetic permeability, while the other additives control grain growth and reduce power loss. The mixed pre-sintered materials from different conditions further create a composite structure with optimized grain distribution and reduced porosity, achieving broad temperature range adaptability.
2Use of energy by moving object
If mixed pre-sintered materials are used to inhibit grain growth and improve structural uniformity, then power consumption is reduced, but manufacturing process complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-sintering materials under different conditions before final mixing and sintering. This preliminary sintering creates materials with different grain growth characteristics that, when mixed, inhibit excessive grain growth during final sintering. The pre-sintered materials are prepared in advance with controlled grain structures, which then self-regulate during the final sintering process to achieve uniform microstructure and low power consumption without requiring complex real-time control during manufacturing.
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 achieves low power consumption (Pcv ≤ 220 kW/m3 at 25° C., ≤ 250 kW/m3 at 100° C., and ≤ 330 kW/m3 at 140° C.) with high initial magnetic permeability and saturation magnetic flux density, suitable for wide temperature variations.
Implementation Method 1
the grain boundary segregation can improve the electrical resistivity and reduce the eddy-current loss
Implementation Method 2
The MnZn ferrites are required to have comprehensive performances. While meeting the saturation magnetic flux density and high magnetic permeability requirements
Data Source
AI summary
The MnZn ferrite material includes principal components and auxiliary components, where the principal components include: 52.5 mol % to 53.8 mol % of Fe2O3, 8.8 mol % to 12 mol % of ZnO, and the balance of MnO; the auxiliary components include: 0.35 wt % to 0.5 wt % of Co2O3, 0.03 wt % to 0.08 wt % of CaSiO3, 0.01 wt % to 0.04 wt % of Nb2O5, and 0.05 wt % to 0.12 wt % of TiO2 and RE elemental components; the RE elemental components include one or more from the group consisting of 0 wt % to 0.04 wt % of Gd2O3, 0 wt % to 0.02 wt % of Ho2O3, and 0 wt % to 0.03 wt % of Ce2O3; the auxiliary components are all represented by a mass percentage relative to a total mass of the Fe2O3, the MnO, and the ZnO.