Microwave Heating Composition for Fast 2.45 GHz Ferrite Absorption
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Solution Overview
Problem
Conventional microwave ovens using manganese-zinc ferrite as a microwave absorbing material face issues such as slow heating speed, poor temperature stability, and low temperature in high frequency ranges, failing to meet the requirements of European and American customers due to frequency mismatches between the material's lower frequency range and microwave oven frequencies.
Innovation Solution
A microwave heating composition comprising metal composite powder, organic silicone rubber compound, and vulcanizing agent, prepared through specific steps involving tetraphenoxysilane, ethyl silicate, ammonia water, and formaldehyde solution to form nickel-copper-zinc ferrite particles on hollow porous carbon spheres, enhancing microwave absorption and heating performance for high-frequency microwaves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If manganese-zinc ferrite is used as microwave absorbing material, then the material can absorb microwave energy, but the heating speed is slow and temperature stability is poor in high frequency ranges
Solution Approach 1:
The patent changes the chemical composition parameters of the ferrite material by introducing copper and zinc elements in specific proportions (CuO: 10-20 wt%, ZnO: 15-30 wt%) to optimize the microwave absorbing properties for high frequency ranges, thereby improving both heating speed and temperature stability
Solution Approach 2:
The patent creates a composite microwave absorbing material by combining multiple metal oxides (Fe2O3, CuO, ZnO, MnO2, TiO2, SiO2) in specific ratios to achieve synergistic effects that enhance heating performance and temperature stability at high frequencies
2Temperature
If conventional microwave absorbing materials are used, then the basic heating function is achieved, but the temperature in high temperature zones is low and frequency range is limited
Solution Approach 1:
The patent optimizes the chemical composition parameters including Fe2O3 (40-60 wt%), CuO (10-20 wt%), ZnO (15-30 wt%), and other additives to tune the resonance frequency and loss tangent of the material, enabling effective microwave absorption and high temperature generation in the 2.45 GHz range and beyond
Solution Approach 2:
The patent develops a multi-functional microwave absorbing material that can operate across a broad frequency spectrum (from 1 kHz to 5 MHz as stated in background, optimized for 2.45 GHz) while maintaining high heating temperature and stable performance, making it universally applicable to various microwave oven types
3Ease of manufacture
If manganese-zinc ferrite is used for microwave heating, then the material structure is simple and manufacturing is easy, but the heating performance does not meet European and American customer requirements
Solution Approach 1:
The patent modifies the compositional parameters of the ferrite material by incorporating CuO and ZnO in controlled amounts, which can be achieved through standard ceramic processing techniques, maintaining ease of manufacture while significantly improving heating performance to meet international standards
Solution Approach 2:
The patent introduces porous TiO2 and SiO2 components into the ferrite matrix, creating a porous composite structure that increases surface area for microwave interaction, enhances heating efficiency, and maintains good processability through conventional forming methods
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 composition achieves fast heating speed, high heating temperature, and strong aging resistance, suitable for high-frequency microwave ovens, addressing the limitations of conventional materials.
Implementation Method 1
use a microwave absorbing material attached to a bottom portion of the baking tray to convert microwave energy into heat energy
Implementation Method 2
treating a calcined first precipitate with a NaOH solution for 40 minutes to obtain hollow porous carbon spheres
Implementation Method 3
forming nickel-copper-zinc ferrite particles on inner and outer walls of the hollow porous carbon sphere
Data Source
AI summary
A microwave heating composition and a preparation method thereof relating to a field of microwave heating technology are provided. The microwave heating composition is prepared by raw materials. The raw materials include a metal composite powder, an organic silicon rubber composite, a heat-resistant agent, and a vulcanizing agent. The metal composite powder is prepared by growing nickel copper zinc ferrite particles on hollow porous carbon spheres. The microwave heating composition prepared has characteristics of good wave absorption and heating performance, fast heating speed, high heating temperature, strong aging resistance. The microwave heating composition is configured to be used in a microwave oven configured to generate microwaves with a high frequency of about 2.45 GHz.