Browsing by Author "YARU S.S"

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    IMPACTS OF COVID-19 PANDEMIC ON NIGERIA’S ECONOMY: EFFECTIVE FOUNDRY TECHNOLOGY AS A SUSTAINABLE SOLUTION
    (Published by Faculty of Engineering,Domneasca Street, 111, Galati, Romania, 2022-02-14) AMBALI IBRAHIM OWOLABI; SHUAIB-BABATA Y.L; BUSARI Y.O; MAHAMOOD R.M; YARU S.S; ABDULQADIR L.B; AJAO K.S; ABDULRAMAN S.O
    This study considered the effect of the Covid-19 pandemic on the economy of Nigeria and investigated the effective application of foundry technology to proffer a sustainable solution to the problem. Domestication of production of motorcycle components, being a significant means of transportation that is required for the development of any society was considered. Aluminium scraps from a waste dump and Belle and Oyun natural moulding sands in Kwara State, Nigeria, which have been previously recommended for non-ferrous casting in previous studies were considered and used for casting of motorcycle/tricycle parts (centre stand and brake pedal) using AFS guidelines. The scraps’ chemical compositions were analysed. Thereafter, some mechanical properties with the microstructure of the aluminium casts and that of commercially obtained imported types were examined using appropriate ASTM standards. Cast aluminium alloy produced using scrap had no casting defects and had some mechanical properties comparable to those available on the markets (imported). Thus, effective usage of naturally available moulding sands in Nigeria for foundry applications would help to proffer sustainable solutions to the nation’s economic problem as a result of the adverse effects of the Covid-19 pandemic.
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    Suitability Assessment of the Properties of Agba Dam Moulding Sand for Foundry Applications
    (Published by the Faculty of Engineering and Technology, University of Abuja., 2025-06-08) AMBALI IBRAHIM OWOLABI; SHUAIB-BABATA Y.L; BUSARI Y.O; ARUNA K.O; COKER H.O; NURUDEEN T. A; YARU S.S; AJAO K.S; ADEGBOLA J.O
    Understanding the attributes of moulding sands is essential for foundry efficiency and high-quality cast production, which can be achieved through adequate information on their properties. The lack of comprehensive information about indigenous natural moulding sands has led to suboptimal casting quality and stunted industry growth in Nigeria. This study employed the rigorous standards set forth by the AFS-American Foundry Men's Society to conduct a comprehensive characterization of Agba dam's natural moulding sand samples' chemical and physico-mechanical properties for sand foundry applications. The chemical analysis revealed a composition of 79.771% SiO₂ and 9.383% Al₂O₃, with trace amounts of Na₂O, K₂O, CaO, Fe₂O₃, MgO, and TiO₂, classifying this sand as Alumino-silicate. The evaluation of physico-mechanical properties showed: silt content (5%), moisture content (1.81%), grain fineness number (44.54), green compressive strength (54.54 kN/m²), dry compressive strength (21.60 kN/m²), specific gravity (2.65), shatter index (40.26% green and 50.89% dry), bulk density (2196.24 kg/m³), permeability (0.05595 cm/sec), and refractoriness (>610°C). Most findings met AFS standards for non-ferrous metal casting. Enhancing the sand's performance, particularly in compressive strength, may be achievable through a suitable binder. Thus, this moulding sand is suitable for non-ferrous metal casting, and its effective use could stimulate economic growth and help address unemployment in Nigeria.