冷却速率对高碳铬铁粉电磁性能的影响  

Effect of cooling rate on the electromagnetic properties of high-carbon ferrochrome powders

作　　者：杨建平[1] 陈津[1] 郝赳赳[1] 郭丽娜[1] 刘金营[2] 

机构地区：[1]太原理工大学材料科学与工程学院,太原030024 [2]中国电子科技集团公司第十二研究所,北京100016

出　　处：《工程科学学报》2016年第4期507-514,共8页Chinese Journal of Engineering

基　　金：国家自然科学基金委员会和上海宝山钢铁集团公司钢铁联合研究基金资助项目(51174252)

摘　　要：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 ferrochrome powders（ HCFCP） obtained at different cooling rates were investigated by means of the vector network method in the frequency range of 1 to 18 GHz. It is found that both the real part and the imaginary part of the relative complex permittivity of HCFCP show an increasing order with a rising in cooling rate at most frequencies,of which prominent peaks occur in the imaginary part of the air-cooled and water-cooled powders on account of polarization relaxation.For comparison,both the relative complex permeability and magnetic loss factor present complex change histories,where the real part of the relative complex permeability decreases as the cooling rate rises,and the imaginary part of the water-cooled powders occupies the dominant except for the frequency range from 3 to 5 GHz. While peaks in the imaginary part of each cooling sample principally result from the effect of nature resonance and magnetic hysteresis respectively corresponding to low frequency and high frequency. The reflection losses of furnace-cooled,air-cooled and water-cooled HCFCP with the values of- 2. 30,- 2. 15 and- 2. 07 d B severally at 2. 45 GHz,could meet the need of microwave heating in principle. By overall consideration,the water-cooled powders are determined as the optimal materials for solid-phase decarburization of HCFCP in a microwave field,attributed to a higher dielectric loss factor as well as a higher magnetic loss factor.

关 键 词：铬铁 冷却速率 显微结构 电磁性能 微波加热 

分 类 号：TG142.7[一般工业技术—材料科学与工程] TF641[金属学及工艺—金属材料]