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>Microwave absorption properties of steelmaking dusts: effects of temperature on the dielectric constant (ε′) and loss factor (ε′′) at 1064 MHz and 2423 MHz
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Microwave absorption properties of steelmaking dusts: effects of temperature on the dielectric constant (ε′) and loss factor (ε′′) at 1064 MHz and 2423 MHz
The microwave absorption properties of a material depend largely on the dielectric properties of the material being heated. Therefore, the influences of temperature on the dielectric constant ( ε ′), loss factor ( ε ′′), loss tangent (tan? δ _(d) ) and penetration depth ( D _(P) ) of steelmaking dust at frequencies of 1064 MHz and 2423 MHz were measured. Three steelmaking dust samples were studied. The effects of temperature on the dielectric properties of the samples were insignificant at temperatures below 600 °C. However, above this temperature, a rapid rise in the values of the dielectric properties of the samples was observed. Comparing the thermogravimetric analysis and differential scanning calorimetry (TGA-DSC) results and mass spectra (MS) of the dusts with their dielectric properties revealed that the changes in the dielectric values of the dusts were associated with the thermal decomposition of calcium carbonate and the release of CO/CO _(2) gases. Furthermore, the increase in the electrical conductivity of the samples at high temperature resulted in increased dielectric values. The behavior of the loss tangent of the samples with increasing temperature coincided with the behavior of the loss factor. The penetration depth decreased with an increase in temperature at both frequencies, while an increase in the dielectric properties caused a significant decrease in the penetration depth. The results indicated that steelmaking dusts have good microwave absorbing properties owing to their carbon and iron oxide contents.
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机译：材料的微波吸收特性在很大程度上取决于被加热材料的介电特性。因此，温度对频率为的炼钢粉尘的介电常数（ε′），损耗因子（ε′），损耗角正切（tanδδ_（d））和熔深（D _（P））的影响。测量了1064 MHz和2423 MHz。研究了三个炼钢粉尘样品。温度低于600°C时，温度对样品介电性能的影响微不足道。然而，在该温度以上，观察到样品的介电性能值快速上升。将粉尘的热重分析和差示扫描量热法（TGA-DSC）结果和质谱（MS）进行比较，发现其粉尘的介电值变化与碳酸钙的热分解和释放有关。 CO / CO _（2）气体。此外，样品在高温下的电导率增加导致介电值增加。样品的损耗角正切随温度升高的行为与损耗因子的行为一致。在两个频率下，穿透深度均随温度的升高而降低，而介电性能的提高则导致穿透深度的显着降低。结果表明，炼钢粉尘由于其碳和氧化铁含量而具有良好的微波吸收性能。
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