Hexagonal Ferrite Composition for Peak Frequency-Tuned Radio Absorbers
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Solution Overview
Problem
Existing radio wave absorbers using magnetoplumbite-type hexagonal ferrites face challenges in adjusting the peak frequency to target frequency bands, limiting their effectiveness in diverse radio wave applications.
Innovation Solution
A method involving adjusting the pH of an aqueous solution containing Fe, Al, and metal salts to exceed 8.0, followed by drying and firing, to produce a magnetoplumbite-type hexagonal ferrite powder with a controlled Al-to-Fe ratio, allowing for precise tuning of the peak frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetoplumbite-type hexagonal ferrite is used as a radio wave absorber, then radio wave absorption performance is improved, but the ability to adjust peak frequency to target frequency bands deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling the aluminum content (x value) in the magnetoplumbite-type hexagonal ferrite composition AFe(12-x)AlxO19. By adjusting the aluminum substitution level for iron, the peak frequency of the radio wave absorber can be tuned to match target frequency bands while maintaining excellent absorption performance. This compositional parameter adjustment resolves the contradiction between achieving high absorption performance and enabling frequency adjustment capability.
2Manufacturing precision
If aluminum substitution in magnetoplumbite-type hexagonal ferrite is increased, then peak frequency can be adjusted, but manufacturing precision control becomes more difficult
Solution Approach 1:
The patent systematically varies the aluminum content parameter (x) in the composition formula AFe(12-x)AlxO19 to achieve different peak frequencies. By establishing clear relationships between the compositional parameter x and the resulting peak frequency, the patent enables precise frequency control through manageable compositional adjustments, resolving the contradiction between manufacturing precision and ease of manufacture.
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
Enables the production of radio wave absorbers with desired peak frequencies, enhancing their absorption performance across various frequency bands, particularly in high-frequency ranges.
Implementation Method 1
a step A of adjusting a pH of an aqueous solution containing a Fe salt, an Al salt, and at least one metal element salt selected from the group consisting of a Sr salt, a Ba salt, a Ca salt, and a Pb salt to exceed 8.0, thereby obtaining a reaction product
Implementation Method 2
a step C of firing the dried product obtained in Step B, thereby obtaining a fired product
Data Source
AI summary
A method for producing a powder of a magnetoplumbite-type hexagonal ferrite which is an aggregate of particles of a compound represented by Formula (1), the method including: a step A of adjusting a pH of an aqueous solution containing a Fe salt, an Al salt, and at least one metal element salt selected from the group consisting of a Sr salt, a Ba salt, a Ca salt, and a Pb salt to exceed 8.0, thereby obtaining a reaction product; a step B of drying the reaction product obtained in the step A, thereby obtaining a dried product; and a step C of firing the dried product obtained in Step B, thereby obtaining a fired product, and application. In Formula (1), A represents at least one metal element selected from the group consisting of Sr, Ba, Ca, and Pb, and x satisfies 1.5≤x≤8.0.AFe(12-x)AlxO19 Formula (1)