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This study describes using carbon fibers coated with magnetic material as a filler in polyethylene for EMI shielding. It investigates how to utilize barium ferrite (BaFeO3) as a conducting filler in a polyethylene matrix by optimizing the conditions for its electroless deposition onto carbon fibers. Various polymer nanocomposite samples were prepared using varying concentrations of BFO@CF. Scanning electron microscopy is used to assess the surface appearance of the composite and the distribution of BFO@CF within the polymer matrix. Including MWCNT/graphene nanoplatelets exhibit superior shielding properties, and the polymer composite with the BFO@CF demonstrates enhanced mechanical properties. The 8.2 to 12.4 GHz frequency range is used to study the EMI shielding properties. For the composition ratio of LDPE: MWCNT: GNP: BFO@CF (50 : 5 : 47.5 : 2.5), a maximum shielding of 67 dB was attained. After BFO@CF was added to the matrix, the absorption mechanism rather than the reflection mechanism dominated the shielding mechanism. A thorough evaluation and discussion of the shielding mechanism and parameters are presented. [ABSTRACT FROM AUTHOR]

This paper demonstrates the characterization of High Velocity Oxygen Fuel (HVOF) sprayed NiGrFeS coating on SAE 1008 cold rolled steel as a substrate to improve the surface properties for tribological applications. A combination of characterization techniques, such as XRD and SEM/EDAX procedures, have been used to evaluate the coatings as well as for mechanical and microstructural characteristics. Additionally, the porosity, microhardness, coating thicknesses, and coating density have been arrived at a view to obtain structure property co-relations. The HVOF overrides other thermal spray processes in terms of specific advantages of getting superior properties. Being a new development in the family of spray technology, the various issues such as coating quality, surface characteristics and other associated factors are being addressed and reported with the research work carried out. It is observed from the data the microhardness values have decreased across the depth of the coatings. [ABSTRACT FROM AUTHOR]