研究目的
To study the microwave transmission performance of fused silica ceramics at different thicknesses, temperatures, and frequencies (915 MHz and 2360 MHz) to design refractory structures with good transmission performance for high-temperature microwave heating applications.
研究成果
Fused silica ceramics exhibit excellent microwave transmission performance with regular fluctuations in PTC due to thickness, showing transmission peaks at specific thicknesses (e.g., 0.033 m, 0.065 m, 0.098 m at 2360 MHz). Transmission peaks shift to smaller thicknesses with increasing temperature, but the shift is small (less than λd/8), allowing good performance over a wide temperature range. Fused silica outperforms mullite and alumina ceramics, especially at high temperatures, due to minimal changes in electromagnetic properties. This provides guidance for selecting refractory materials and optimizing thicknesses to maximize microwave energy utilization in high-temperature heating processes.
研究不足
The study is theoretical and computational, relying on assumed dielectric properties from literature; no experimental validation is conducted. The frequency 2360 MHz is used instead of the common 2450 MHz, which may limit direct applicability. The analysis is limited to normal incidence and single-layer materials, not accounting for complex geometries or multi-layer structures.
1：Experimental Design and Method Selection:
The study is based on theoretical calculations using transmission line theory to compute the Power Transmission Coefficient (PTC) for fused silica ceramics. Equations (1)-(5) from the paper are used to model electromagnetic wave propagation in a single-layer plate under normal incidence.
2：Sample Selection and Data Sources:
The material studied is fused silica ceramics. Dielectric constant and loss tangent data at various temperatures and frequencies (915 MHz and 2360 MHz) are sourced from references [21,22] and provided in Table 1 of the paper.
3：List of Experimental Equipment and Materials:
No specific experimental equipment or materials are listed as the study is computational; it relies on theoretical models and existing data.
4：Experimental Procedures and Operational Workflow:
The procedure involves calculating PTC values using the given equations and dielectric data for thicknesses from 0 to 0.1 m, temperatures from 25°C to 1400°C for 915 MHz and 25°C to 800°C for 2360 MHz, and analyzing the results to identify transmission peaks and shifts.
5：1 m, temperatures from 25°C to 1400°C for 915 MHz and 25°C to 800°C for 2360 MHz, and analyzing the results to identify transmission peaks and shifts.
Data Analysis Methods:
5. Data Analysis Methods: Data analysis includes plotting PTC patterns (e.g., Figs. 2 and 3), determining transmission peak positions and shifts, comparing with mullite and alumina ceramics from previous studies, and calculating wavelength and penetration depth using Eqs. (6) and (7).
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