论文部分内容阅读
采用电弧熔炼和高能球磨以及回火热处理工艺制备了Mn_(55)Al_(45)合金粉体,使用SEM、XRD和网络矢量分析仪分析了球磨时间和回火温度对Mn_(55)Al_(45)合金微粉的形貌、相结构及吸波性能的影响。结果表明:随球磨时间增加,粉体中Al_2Mn_3和Al_(11)Mn_(14)的相对含量会随之而增加;粉体的复介电常数虚部、复磁导率虚部的共振峰频率和吸收峰频率都随球磨时间的增加而逐渐向低频移动,球磨18 h的粉体有很好的频宽效果;球磨24 h时,反射率峰值在16 GHz处达到-28 dB。随回火温度的增加,粉体中的Al_2Mn_3增多,球磨18 h后和经400℃回火处理的粉体,在6~18 GHz频段内有较好的综合吸波性能。在吸波涂层厚度d=2.0 mm下,400℃回火处理的粉体在17 GHz频率处具有最小反射率值为-26.4 dB。
The Mn 55 Al 45 alloy powders were prepared by arc melting, high energy ball milling and tempering heat treatment. The effects of ball milling time and tempering temperature on the microstructure and properties of Mn 55 Al 45 alloy were analyzed by SEM, XRD and network vector analyzer. ) Alloy powder morphology, phase structure and the impact of absorbing properties. The results show that the relative content of Al 2 Mn 3 and Al 11 Mn 14 in the powder increases with the increase of milling time. The complex complex permittivity imaginary part, And the absorption peak frequency gradually moved to low frequency with the increase of ball milling time. The powder with 18 h ball milling had a good bandwidth effect. At the ball milling time of 24 h, the peak reflectivity peaked at -28 dB at 16 GHz. With the increase of tempering temperature, the amount of Al 2 Mn 3 in the powder increases, the microwave absorbing ability of the powder in the range of 6 ~ 18 GHz after 18 h milling and tempering at 400 ℃ is good. At a wave-absorbing coating thickness of d = 2.0 mm, the 400 ° C tempering powder has a minimum reflectance value of -26.4 dB at a frequency of 17 GHz.