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Browsing by Author "Maruf Yinka Kolawole"

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Effect of bio-mineral oil blend quenchant on the mechanical properties of carburized mild-steel
(Springer Nature, 2023) Maruf Yinka Kolawole; Suleman Adeniyi Aliyu; Sefiu Adekunle Bello; Kamoru Olufemi Oladosu; Ilesanmi Jonathan Owoeye
In this study, the effect of bio-mineral oil blend quenchants on the mechanical proper ties of carburized mild steel was experimentally studied and reported. The tensile, hardness, impact, and microstructural test specimens were prepared in line with ASTM standards. Prepared specimens were then buried in a 50:50% ratio mixtures of egg shell/date-seed particulates as carburizing medium in a sealed packed cylindrical crucible. The carburization was then carried out in a muffle furnace at 950 oC for 3 h soaking time at 5 °C/min heating rate and thereafter quenched in different percentage blends of bio-mineral oils. Before the mechanical test and microstructural examination, amples were tempered at 200 oC for 1 h. Results from the experimental findings revealed that water and bio-mineral oil blend quenchants significantly influenced the mechanical properties and microstructure of carburized mild steel in varying degrees depending on the quenching media. Specimen quenched in 100% groundnut oil yielded the maximum yield tensile strength (805.43 MPa) and hardness at the surface edge (173.8 HV) equivalent to 106.7 and 87.66 percentage increment however, the best combination of mechanical properties (tensile strength 738.66 MPa, strain 17.12%, hardness 169.5 HV and impact strength 51.1 J) was obtained in the specimen quenched in 60/40% groundnut oil and SAE40 oil blends respectively. The enhancement in the mechanical property was due to the grain refinement in the microstructure of the bio-mineral oils quenched specimen. The 60/40 groundnut/SAE40 oil blend is therefore recommended for metallurgical heat treatment of mild steel for critical industrial applications
Effect of bio-mineral oil blend quenchant on the mechanical properties of carburized mild-steel
(2023) Maruf Yinka Kolawole; Suleman Adeniyi Aliyu; Sefiu Adekunle Bello; Kamoru Olufemi Oladosu; Ilesanmi Jonathan Owoeye
AbstractIn this study, the effect of bio-mineral oil blend quenchants on the mechanical properties of carburized mild steel was experimentally studied and reported. The tensile, hardness, impact, and microstructural test specimens were prepared in line with ASTM standards. Prepared specimens were then buried in a 50:50% ratio mixtures of eggshell/date-seed particulates as carburizing medium in a sealed packed cylindrical crucible. The carburization was then carried out in a muffle furnace at 950 oC for 3 h soaking time at 5 °C/min heating rate and thereafter quenched in different percentage blends of bio-mineral oils. Before the mechanical test and microstructural examination, samples were tempered at 200 oC for 1 h.Results from the experimental findings revealed that water and bio-mineral oil blend quenchants significantly influenced the mechanical properties and microstructure of carburized mild steel in varying degrees depending on the quenching media. Specimen quenched in 100% groundnut oil yielded the maximum yield tensile strength (805.43 MPa) and hardness at the surface edge (173.8 HV) equivalent to 106.7 and 87.66 percentage increment however, the best combination of mechanical properties (tensile strength 738.66 MPa, strain 17.12%, hardness 169.5 HV and impact strength 51.1 J) was obtained in the specimen quenched in 60/40% groundnut oil and SAE40 oil blends respectively. The enhancement in the mechanical property was due to the grain refinement in the microstructure of the bio-mineral oils quenched specimen. The 60/40 groundnut/SAE40 oil blend is therefore recommended for metallurgical heat treatment of mild steel for critical industrial applications.
Effects of Applied Loads and Aluminium Nanoparticle Additions on Wear Resistance Properties of Particle Reinforced Epoxy Nanocomposites
(2023) Sefiu Adekunle Bello; Maruf Yinka Kolawole; Sunday Wilson Balogun; Johnson Olumuyiwa Agunsoye; Suleiman Bolaji Hassan
The recent technology advancement has emerged aluminium nanoparticles for polymer reinforcements. Mechanical properties of epoxy containing aluminium nanoparticle was reported but its wear resistance is left unstudied. This study has been focused on effect of aluminium nanoparticle reinforced epoxy under different applied loads and velocities. It is obtained that the wear resistance increases with the applied loads but decreases with the percentages by weight of aluminium nanoparticle additions to epoxy. The wear rates recorded with aluminium nanoparticle reinforced epoxy are 81.2% and 82% smaller than those of the unreinforced epoxy and greater than 75.5 and 76.1% reductions noticed with the aluminium microparticle reinforced epoxy under applied loads of 9 and 25 N already reported in literature. Greater percentage reductions in the wear rates affirms aluminium nanoparticle as better reinforcement with improved wear resistance than its aluminium microparticle counterparts. Fishers’ value, 7.389 and prob, 0.042<0.05 affirms that the linear response surface model is significant in evaluating the wear resistance of the aluminium nanoparticle reinforced epoxy with 84.7% predictability while the remnants accounts for the residuals.
Eggshell nanoparticle reinforced recycled low-density polyethylene: A new material for automobile application
(Elsevier, 2021-05-07) Sefiu Adekunle Bello; Nasirudeen Kolawole Raji; Maruf Yinka Kolawole; Mohammed Kayode Adebayo; Jeleel Adekunle Adebisi; Kehinde Adekunle Okunola; Mustekeem Olanrewaju AbdulSalaam
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.
Experimental investigation on enhancing the mechanical properties of biodegradable Zn-3Mg alloys reinforced with snail-shell particulates via powder metallurgy
(2025) Maruf Yinka Kolawole; Sana Anwar; Esra Bozkaya; Asli Gunay Bulutsuz; Siyami Karahan; Hakan Yilmazer; Farasat Iqbal
Abstract Biodegradable zinc-based alloys are promising candidates as a new generation implant materials due to their favorable degradation rates compared to magnesium and iron. However, their relatively low mechanical strength hinders their clinical usage. In this experimental study, Zn–3Mg/xSnS ( x = 0.5–6 wt%) composites were manufactured via powder metallurgy. The performance of the obtained samples was systematically investigated via microstructural analysis (SEM), mechanical properties (compressive yield strength, elastic modulus, and hardness), in vitro degradation, and cytocompatibility with L929 fibroblast cells. According to the obtained results, SnS reinforcement significantly improved mechanical performance. Microstructural investigation revealed homogeneous SnS distribution and refinement of intermetallic phases. Among all the sample groups, Zn–3Mg–2SnS resulted in a compressive yield strength of 402 MPa, elastic modulus of 49 GPa, and hardness of 151 HV. Degradation tests were performed for 28 days, and the samples exhibited a moderate corrosion rate ( ~ 0.2 mm/year). Cytotoxicity assays confirmed >70% cell viability at 50% extract concentrations. These results show that Zn–3Mg alloys can be efficiently reinforced with bio-derived SnS particles, improving their strength and biocompatibility without decreasing their degradation performance. Graphical Abstract
Mechanical Property Performance of Fe-SnS Hybrid Reinforced Aluminum Composites
(2023) Maruf Yinka Kolawole; Sefiu Adekunle Bello; Tolulope Peace Babatunde; Kehinde Raheef Adebayo
In this paper, the mechanical properties of a hybrid iron filing (Fe)-snail shell (SnS)-reinforced discarded aluminum matrix were investigated. Prepared iron filling (20 µm) and snail shell (70 µm) particulates at a mix ratio of 1:3 constituting 2, 4, 6, and 8 wt% in hybrid weight fractions as the reinforcing phase in the aluminum matrix were investigated. Both the unreinforced aluminum matrix and the reinforced hybrid composites were produced via a double-stir die casting technique. Metallurgical optical examination, density, tensile, hardness, and impact testing were carried out to appraise the mechanical property performance of the developed composites relative to the unreinforced Al matrix. The results show that with increasing hybrid-Fe-SnS particulates in the reinforcing phase, the hardness and ultimate tensile strength (UTS) of the reinforced Al-matrix composite also increase. The maximum tensile strength (106.10 MPa) and hardness value (62.92 HRB) equivalent to 86.50% and 24.90% increments, respectively, were obtained at 8 w% of the hybrid reinforcement. Meanwhile, the hybrid reinforcement only increased the impact energy of the composite by 2.60% at 2 wt% Fe-SnS addition, beyond which the impact strength decreased. A marginal decrease in the weight of the composite with an increase in hybrid reinforcement was also observed. Hence, Fe-SnS hybrid particulates offered a favorable influence on the mechanical property performance of Al/Fe-SnS hybrid composites compared to that of the unreinforced Al matrix.
Microstructure and mechanical properties of Al0.44Si0.32Ni0.09Fe0.05V0.05 alloy containing nanosilica for vehicle bonnet applications
(Elsevier, 2025-01-25) Sefiu Adekunle Bello; Maruf Yinka Kolawole; Raphael Gboyega Adeyemo; Funsho Olaitan Kolawole; Uthman Ayomide Aliu; Ayodeji Aboyeji; Ahmed Rafiu; Abdul Ganiyu Funsho Alabi; Oyetunji Akinlabi
Stringent conditions of service that demand improved properties spurs continuous research on expired products to emerge new materials for engineering applications. An alloy was developed from aluminium scraps, ferrosilicon, and nickel alloy. The developed alloy was modified by nanosilica and the produced materials were examined. Result displays silica having an average size of 63.76 nm. In addition, new phases were detected in the alloys due to nanosilica additions and heat treatment. Moreover, the threadlike grain boundary phases of the control alloy changed to rounded tiny particles after the heat treatment. Silica addition to the alloy caused refinements of grains leading to numerous grain boundaries while the grain boundary phases of the heat treated nanosilica modified alloy appear in form of a modulated featherlike structure. An improvement in tensile strength was noted up to 10 wt% of nanosilica additions. Reduction in the impact energy prevails above 6 wt% of nanosilica addition. Heat treatment enhanced tensile properties and impact energies but reduced the hardness values of the developed alloys. Moreso, linear response surface models are significant in predicting the tensile strengths of the developed alloys. Model diagnostics like outlier and Cook’s distance confirm no error in the models. Comparation of properties affirms that tensile strength, tensile strain, and impact energy of the heat treated Al0.44Si0.32Ni0.09Fe0.05V0.05 alloy containing 10 wt% of nanosilica are greater than those of the LEXUS LX570 (2018 model), TOYOTA HILUX (2017 model), and TOYOTA CAMRY (2018 model). Hence, it is a strong, ductile, tough, and less hard material for the bonnet applications.
Vehicle bumper fascia prototyping using sustainable nanocomposites
(2025) Sefiu Adekunle Bello; Sodiq Olamide Olaitan; Mohammed Kayode Adebayo; Lateef Olayinka Akinwande; Funsho Olaitan Kolawole; Maruf Yinka Kolawole; Abdulmumuni Ariboh Suberu; Fawaz Afolami Arowoduye; Muhiz Akangbe; Roseline Ifeoluwa Michael; Timothy Adeyi
Eggshells and date seeds are wastes which contribute to land pollution. Their conversions to useful materials are important to save the environment from the health hazards associated with rotten eggshells and possible impacts from the date seed wastes. This study focuses on conversion of eggshells and date seeds into reinforcing particles for producing sustainable polymeric and metallic nanocomposites for prototyping a vehicle bumper fascia. Eggshell nanoparticles were incorporated into low-density polyethylene up to 12 wt%. Metallic nanocomposites were produced using Al–Cu–Mg sourced from aluminium alloy scraps and date seed particles and then, heat treated. The developed nanocomposites were analysed chemically, structurally, and mechanically. The structural integrity of the polymeric nanocomposites was confirmed by the scanning electron microscope. Enhancements in impact energy, tensile and flexural strengths at 12 wt% of eggshell nanoparticle additions to the very low-density polyethylene are 1.5, 110.4 and 47.7 %, respectively. 1 wt% date seed particle reinforced Al–Cu–Mg that has highest impact energy after annealing treatment is selected for the mould parts fabrication for forming the bumper fascia. Property comparison of the produced polymeric nanocomposites with those of existing bumper fascia materials affirms that the tensile strength and impact energy of the nanocomposite that contains 12 wt% eggshell nanoparticles are suitable for the automobile bumper fascia. Hence, fabrication of the bumper fascia using the VLDPE/12 wt% eggshell nanocomposite was fruitful.
Wear resistance properties of particles‑reinforced epoxy nanocomposites using historical data response surface models
(Springer, 2023-08-30) Sefiu Adekunle Bello; Raphael Gboyega Adeyemo; Abdul Ganiyu Funsho Alabi; Maruf Yinka Kolawole; Sadam Oniwa; Azim Bayonle Kareem; Muizz Oyeleye Azeez; Bunmi Bisola Olaiya; Tosin Adewale Salami; Sofiu Oladimeji Abdulkareem; Quamdeen Aremu Lawal; Kabir Omoniyi Mohammad; Peter Akinola Akindahunsi; Johnson Olumuyiwa Agunsoye; Suleiman Bolaji Hassan
Knowledge of wear resistance properties of newly emerging materials as complements to their mechanical properties is important to broaden their applications. This study focuses on wear resistance properties of particle-reinforced epoxy. Results obtained reveal that surface wear of the examined epoxy-based composites occurred by the crack initiation by the abrasive tips of the wear tester, crack propagation and/ or crack pinning. Linear regression model has accuracies of 99.94, 99.92, 99.93, 99.88, 99.91 and 99.92% with respect to various grades of composites examined. Response surface two-functional interaction model exhibits a better goodness of fit than the response surface linear model that shows an outlier. The response surface linear model best fits the wear rates of AlnpUCSnp/epoxy and AlnpCCSnp/epoxy with respective adequate precision of 14.138 and 10.204 affirming the model’s adequate signal. Hence, this study establishes that epoxy-based hybrid composite having 4.7%–82.47 nm-sized aluminium-5.76%–49.85 nm-sized carbonised coconut shell hybrid particles experiences a surface wear of 0.00272721 g per metre when it is in contact with a rough surface under an applied load of 16.71 N at a speed of 0.7 ms−1.

Browsing by Author "Maruf Yinka Kolawole"

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