Study on Electromagnetic Performance of La0.5Sr0.5CoO3/Al2O3 Ceramic with Metal Periodic Structure at X-Band

Abstract

A radar absorbing material (RAM) is designed by combining the La0.5Sr0.5CoO3/Al2O3 ceramic and the metal periodic structure. The phase constitution and the microscopic morphology of the La0.5Sr0.5CoO3/Al2O3 ceramic are examined, respectively. The electrical properties and magnetic properties of the La0.5Sr0.5CoO3/Al2O3 ceramic are also measured at the temperature range of 25~500 °C. Based on the experimental and simulation results, the changes in the reflection loss along with the structure parameters of RAM are analyzed at 500 °C. The analytical results show that the absorption property of the RAM increases with the increase in the temperature. When the thickness of the La0.5Sr0.5CoO3/Al2O3 ceramic is 1.5 mm, a reflection loss <−10 dB can be obtained in the frequency range from approximately 8.2 to 16 GHz. More than 90% microwave energy can be consumed in the RAM, which may be applied in the high temperature environment.

Enhancing the microwave absorption performance of graphite/Al2O3 composites through manipulating sheet resistance

“…Generally, the absorption performance of microwave absorbing materials is affected by their chemical composition, microstructure, etc. [11][12][13][14][15][16] At present, there are still some problems in the research of absorbing materials, such as magnetic loss absorbing materials, which are usually composed of ferrite, hydroxy iron, and other absorbents in a certain proportion to the matrix. Their wave absorbing performance is very good, but their density is often large, which is a significant burden in practical applications, and there are problems that it is difficult to withstand heavy loads and it is difficult to apply in air and ocean scenarios.…”

“…According to the mechanism of absorbing waves, traditional absorbing materials are mainly divided into magnetic loss absorbing materials and dielectric loss absorbing materials. Generally, the absorption performance of microwave absorbing materials is affected by their chemical composition, microstructure, etc 11–16 . At present, there are still some problems in the research of absorbing materials, such as magnetic loss absorbing materials, which are usually composed of ferrite, hydroxy iron, and other absorbents in a certain proportion to the matrix.…”

Vat Photopolymerization of Ceramic Parts: Effects of Carbon Fiber Additives on Microstructure and Mechanical Performance

“…Alumina (Al 2 O 3 ), as a typical ceramic material, not only possesses high hardness, strength, and stability [1][2][3] but also exhibits excellent thermal, optical, and electromagnetic properties [4][5][6]. It is now widely used in industrial, medical, chemical, and aerospace fields [7][8][9].…”