| Abstrakt: |
In this paper, a detailed study on PVA composites’ EMI shielding behavior at E, F, I, and J microwave frequencies, as well as their mechanical, dielectric, and magnetic properties with the inclusion of Cocos nuciferahusk biocarbon andFeSi3particles, was performed. A hand layup process was used to fabricate composites that were trimmed with respect to ASTM standards. Here are the results showing Cocos nuciferahusk biocarbon with FeSi3particles increases tensile strength and hardness to 44.7 MPa and 86 shore-D, respectively. Adding Cocos nuciferahusk biocarbon up to 3 vol.% and FeSi3up to 5 vol.% decreases elongation % minimum by 173.6% for composite designation PB2 and 123.4% for composite designation PBF3 correspondingly. Adding 3 vol.% Cocos nuciferahusk biocarbon to composite PB2 increases dielectric constant and loss by 25% and 33%, respectively, and adding 5 vol.% FeSi3to composite PBF3 enhances dielectric constant and dielectric loss by 69 and 85%, respectively. Similarly, composite designation PBF3 demonstrates the maximum values for magnetization, retentivity, and coercivity to about 1010E−6 emu, 990E−6 emu, and −6000 G with 3 vol.% of biocarbon and 5 vol.% of FeSi3content. Comparing PB1 and PB2 composite designations for EMI shielding reveals an improvement in shielding properties of over 87% for all bands due to the 3 vol.% biocarbon content. Maximum EMI shielding values observed are 31.4, 37.3, 42.6, and 48.4 dB for E, F, I, and J bands, respectively, for composite designation PBF3. With such outstanding characteristics, EMI shields made from Cocos nuciferahusk biocarbon and FeSi3-hardened PVA composites could be used in a variety of industrial, defense, and space applications. |
Full text from SpringerLink