Electromagnetic Interference Shielding For Solid Rocket Motors- Missiles

Abstract

Electromagnetic interference shielding has been used extensively in various electrical equipments to avoid interference due to Electrical and Magnetic fields. The Electromagnetic (EM) waves are the original source of EM interference and affect the life of expensive electronic assemblies. Electromagnetic interference shielding materials, used initially were usually metals that attenuate EM waves due to reflection phenomenon, but huge drawback for using metals as EMI Shielding purpose was their heavy structures and cost. Later, for development of electromagnetic interference shielding materials, various polymers were considered due to their properties of corrosion resistant, longer life time, less weight, specific stiffness, high strength, and ease in manufacturing. This research has primary focus on development of light weight polymer based EMI shielding material that can be economical, reliable and useful in terms of cost and benefit analysis for Military applications. Therefore, an EMI shielding material based on poly ethylene terephthalate (PET) polymer was selected due to its availability in abundance, thermal strength and economical nature. Further, PET nanocomposite based on hexagonal boron nitrate Nano sheets was also fabricated for enhanced tensile strength. This research depicted that both the PET and PET nanocomposite possess properties of absorption and reflection of EM wave respectively for attenuation of EMI. However, PET nanocomposites exhibited better tensile strength as well as shielding effectiveness in 2-18 GHz frequency range. The upshot of this research work is that PET nanocomposites are considered suitable option for EMI shielding.