Double layer microwave absorber based on Cu dispersed SiC composites

作者：Singh Samarjit; Sinha Ankur; Zunke Raj Hemant; Kumar Abhishek^*; Singh Dharmendra

来源：Advanced Powder Technology, 2018, 29(9): 2019-2026.

DOI：10.1016/j.apt.2018.05.008

• Microwave absorption
• Cu dispersed SiC
• Ball milling
• Double layer absorber

The present work has been focused on designing an efficient and cost-effective double layer microwave absorber in 8.2-12.4 GHz frequency range. For the same, Cu particles were dispersed in SiC to achieve enhanced microwave absorption by combining the excellent dielectric characteristics of SiC with highly conductive Cu. Cu dispersed SiC composites were prepared by dispersing various weight fractions of Cu particles in the SiC matrix using planetary ball mill. The Cu dispersion in SiC yielded excellent relative complex permittivity values translating into a decrease in the reflection loss (RL) values of dispersed composites as compared to the pristine counterpart. The minimum RL of -17.18 dB has been observed for 2 wt% Cu dispersed SiC composite at 11.81 GHz with a thickness of 1.3 mm and bandwidth corresponding to -10 dB is 1.77 GHz. Genetic algorithm approach has been implemented to design double layer microwave absorber to further enhance the microwave absorption of the prepared composites for realizing a cost-effective solution. The optimum double layer results show the RL of -32.16 dB at 11.05 GHz with 1.67 mm total thickness and bandwidth corresponding to -10 dB is 2.35 GHz.

• 出版日期2018-9