Preparation, microstructure and performance of interference microwave absorbing cermet composites with frequency–selective screens. Issue 23 (1st December 2022)

• Record Type: Journal Article
• Authors: Li, Xiangming; Zhu, Liangsheng; Sun, Dongyue; Yang, Qing; Liu, Yingxia; Yu, Wanjun; Lv, CuiCui
• Is Part Of: Ceramics international. Volume 48:Issue 23(2022)Part A
• Page Start: 34199
• Page End: 34209
• Publication Date: 2022-12-01
• Subjects: Microwave interference -- Microwave absorbing performance -- Cermet composites -- Microwave reflectivity -- Frequency–selective screens; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.04.313
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Interference microwave absorbing cermet composites with frequency–selective screens (AC/FSS) were successfully prepared by sintering a ceramic green body embedded with stainless–steel wire mesh screens via a rapid heating method. The addition of the screens made the AC/FSS composites increase slightly in density and open porosity and remain unchanged in surface Vickers hardness and compressive strength. Both the number and structure parameters of the screens had a significant effect on the microwave absorbing performance of the AC/FSS composites. The weak microwave absorption by the small amount of zinc oxide and poor microwave interference by the single–layer screen made the AC/FSS composites possess modest microwave absorbing performance. Moreover, the AC/FSS composites showed an improved microwave absorbing performance due to the significantly enhanced microwave interference by the double–layer screens. By optimizing the structure parameters of the upper and lower screens, the AC/FSS composites with double–layer screens possessed surprisingly good microwave absorbing performance with the whole reflectivity–versus–frequency curve below −10 dB, a mean reflectivity as low as −12.9 dB and the lowest reflectivity of −15.2 dB at 12.4 GHz in the 8.0–18.0 GHz frequency range.