|
|||||
|
|
Modeling for the electromagnetic properties and EMI shielding of Cf/mullite composites in the gigahertz range |
|
| Affiliation: | 1. School of Civil Engineering, Central South University, Changsha 410083, People''s Republic of China;2. Department of Mechanical and Aerospace Engineering, Rutgers University, New Brunswick, NJ 08903, USA;3. Department of Mechanical Engineering, Shanghai Maritime University, Shanghai 201306, People''s Republic of China;1. School of Civil Engineering, Central South University, Changsha 410083, China;2. Key Laboratory of Mechanics on Environment and Disaster in Western China, The Ministry of Education of China, Lanzhou University, Lanzhou, Gansu 730000, China;3. Department of Mechanics and Engineering Science, College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou, Gansu 730000, China;4. School of Mechanical and Electrical Engineering, Central South University, Changsha, 410083, China;5. State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha, 410083, China;6. Department of Mechanical and Aerospace Engineering, Rutgers University, New Brunswick, NJ 08903, United States |
| Abstract: | The electromagnetic properties and EMI shielding effectiveness of Cf/mullite composites via the spark plasma sintering were intensively investigated in the gigahertz range (8.2–12.4 GHz). Experimental results have revealed excellent electromagnetic properties and a high value of EMI shielding effectiveness (nearly 40 dB) for Cf/mullite composites with 1.65 vol% carbon fillers at thickness of 2 mm. We quantitatively characterize the contributions of microstructural features to overall EMI shielding effectiveness using a micromechanics-based homogenization model. The EMI shielding effectiveness enhances with respect to the Cf volume concentration before the threshold. The increasing trend of EMI shielding effectiveness with respect to AC (alternating current) frequency can be attributed to enhanced conductivity at high gigahertz range. It is demonstrated that filler and frequency dependent interface effects are essential to obtain excellent electromagnetic properties of Cf/mullite composite. The present research can provide guidances for the design of ceramic-based composites applied in high-temperature EMI shielding devices. |
| Keywords: | EMI shielding Gigahertz range Microstructure Interface effect |
| 本文献已被 ScienceDirect 等数据库收录！ | |