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采用矢量网络参数法在1~18 GHz频段内分别对电阻炉、空气和水浴中冷却的高碳铬铁粉的电磁性能进行研究.随着冷却速率的提高,高碳铬铁粉的相对复介电常数实部和虚部在大多数频率下均增大.空冷和水冷粉料的相对复介电常数虚部在12~18 GHz频率范围内因极化弛豫而产生较大的峰值.同一频率下相对复磁导率实部随冷却速率变化的趋势与相对复介电常数相反.水冷粉料的相对复磁导率虚部在3~5 GHz以外的频段内均大于另两组冷却粉料,且三组粉料的虚部在低频及高频条件下均具有峰值.在2.45 GHz的微波加热频率下,炉冷、空冷及水冷粉料的反射损耗分别为-2.30、-2.15和-2.07 d B.水冷粉料的介电损耗因子及磁损耗因子最大,微波场下具有最佳的升温速率与反应效果.
The electromagnetic properties of high-carbon ferrochromium powder cooled in resistance furnace, air and water bath were studied in the frequency band of 1 ~ 18 GHz by vector network parameter method.With the increase of cooling rate, the relative complexation of high-carbon ferrochrome powder The real part and the imaginary part of the electric constant increase at most frequencies.The imaginary part of the relative complex permittivity of the air-cooled and water-cooled powders has a larger peak due to the polarization relaxation in the frequency range of 12-18 GHz.The same frequency The real part of the relative permeability decreases with the cooling rate and the relative permittivity is opposite.The imaginary part of the relative permeability of the water-cooled powder is larger than the other two groups in the frequency range of 3 ~ 5 GHz , And the imaginary part of the three groups of powders have the peak at both low frequency and high frequency.The reflection losses of furnace cooling, air cooling and water cooled powder are -2.30, -2.15 and -2.07 respectively under the microwave heating frequency of 2.45 GHz d B. The dielectric loss factor and magnetic loss factor of water-cooled powder are the largest, and the optimum heating rate and reaction effect are obtained under the microwave field.