Browsing by Author "Stephen Durowaye"

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    Electronics, optical, and thermal management applications of nanocomposites in aeronautics
    (Elsevier, 2023) Sefiu Adekunle Bello; Stephen Durowaye; Maruf Yinka Kolawole
    Nanocomposites are rapidly growing desirable materials of the present dispensation because of their unique characteristics. They find application in the aeronautic sector and other fields. The choice or selection of the materials (nanofillers and matrices) that make up the nanocomposites is very important for obtaining the desired results. For aeronautic applications, attention has been focused on materials that exhibit superlative mechanical and thermal characteristics. Equally important are electrical, optical, electronics, chemical, and biodegradability characteristics. Polymeric nanocomposites containing nanoparticles (carbon nanotubes, layered silicates, etc.), which are dispersed in polymer matrices have attracted much attention. This is due to the superlative properties exhibited by nanoparticles. Nanocomposites have several major capabilities, some of which are high strength, ability to resist fatigue, corrosion-resistance, design flexibility, thermal stability, thermal conductivity, lower assembly costs, and lightweight components with no compromise on reliability. Application of nanocomposite materials for aeronautic purposes is increasing because of the advantages that nanocomposites have over metals. Furthermore, the achievements recorded in the aviation industry are attributable to the application of nanocomposites. Hence, this chapter focuses on nanocomposites, their manufacturing methods, and aeronautic applications with emphasis on the characteristics of the polymeric nanocomposites.
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    Influence of thermal ageing on the microstructural and mechanical characteristics of banana stem particles reinforced aluminium-alloy matrix composites
    (2024) Sefiu Adekunle Bello; Abdul Ganiyu Funsho Alabi; Suleiman Danjuman Daudu; Stephen Durowaye; Mohammed Kayode Adebayo; Luqman Babatunde Eleburuike; Sikiru Ottan Abdulraman; Shuaib Ajibola Mohammed
    The influence of thermal ageing on the microstructural and mechanical characteristics of banana stem particles (BSp) reinforced aluminium-alloy matrix composites was investigated. Sand casting was used to produce the composites, comprising aluminium alloy matrix reinforced with BSp of varying weight ratio of 0 wt. %, 1 wt. %, 3 wt. %, 4 wt. %, 5 wt. % and 6 wt. % were thoroughly mixed. Test samples for mechanical characterisation were prepared from the sand cast (6 mm diameter by 125 mm rods for tensile test). Thermal ageing was done for 2 hours (hrs) at 350 0C. The composites were evaluated for tensile, modulus of elasticity, hardness, and microstructural characteristics. The thermally aged samples demonstrated greater tensile strength and toughness as the concentration of BSp increased up to 5 wt. % in the composite in comparison with the as-cast samples. The greatest characteristics were demonstrated at 5 wt. % BSp concentration. Lower hardness was demonstrated by the as-cast samples in comparison with the aged-hardened samples. There was 5 wt. % BSp concentration in the alloy enhanced thermal ageing. These indicate that greater mechanical characteristics of the composites can be obtained by thermal ageing.