关键词: 碳/紫外光固化树脂, 水热, 3D打印, 微波吸收, 电子材料

Abstract:

C/UV curable resin electromagnetic metamaterials were prepared by 3D printing, and the effects of heat treatment temperatures (700℃, 800℃ and 900℃) of C-balls on the microwave absorption properties of the prepared C/UV curable resin samples were investigated. The results showed that the microwave absorption properties of C/UV curable resin electromagnetic metamaterials indicated a trend of first enhancement and then decrease with increasing heat treatment temperature. The best performance of C/UV curable resin samples was obtained when the heat treatment temperature was 800℃. Its minimum reflection loss of -42.9dB was obtained at 8.6mm matched thickness, and the effective absorption bandwidth at 9.4mm matched thickness was up to 6.0GHz. The performance differences of different samples were related to their impedance matching and attenuation coefficients, and the graphitization degree of the C-balls was lower at 700℃ heat treatment temperature, and the reflection of electromagnetic waves was lower at 9.4mm matched thickness. At 700℃, the graphitization degree of C-balls was low, which resulted in a weak reflection of electromagnetic waves, while the low graphitization also led to a small attenuation coefficient and poor microwave absorption performance of this sample. When the heat treatment temperature rose to 800℃, the enhanced graphitization of the C-balls improved the high-frequency polarization relaxation and attenuation coefficients so that the sample exhibited excellent microwave absorption properties. With the increase of heat treatment temperature to 900℃, the graphitization degree of C-balls was further increased, leading to the high-frequency polarization of the sample. As the heat treatment temperature increases to 900℃, the graphitization degree of the C-balls was further enhanced, resulting in the suppression of the high-frequency polarization relaxation of the sample and the weakening of the impedance matching, and thus the microwave absorption intensity and effective absorption bandwidth of the sample began to weaken. The above study clarified the influence of heat treatment temperature on the microwave absorption performance of carbon materials, which provided an effective reference for the study of this type of materials, and the preparation method of 3D printing adopted in the study also provided a new idea for the exploration of the preparation process of new microwave absorption materials.

Key words: C/ultraviolet curing (C/UV) curable resin, hydrothermal, 3D printing, microwave absorption, electronic materials