Browsing by Author "Odusote, Jamiu Kolawole"
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Item Assessment of Metallic Contaminants in Grinded Millet using Domestic Grinding Machine(Faculty of Engineering and Technology, University of Ilorin, 2016) Odusote, Jamiu Kolawole; Soliu, Ganiyat A.; Ahmed, Ismaila Idowu; Abdulkareem, Sulaiman; Akande, Kareem AkandeIn this study, the quantity of metallic contaminants extracted from grinded millet was evaluated. The millet was grinded in three different forms; wet, paste, and dry forms for up to 3 minutes using locally fabricated grinding machine with cast grinding discs. Separate grinding discs were used for different millet forms, while the same quantity of millet, 1 kg, was used throughout the experiments. The millet was soaked for 24 hours before grinding in order to obtain wet and paste forms of the millet. Metallic contaminants were carefully extracted from the grinded millet using magnetic bed along with sedimentation and decantation. The extracted materials were then quantified to ascertain the food form that produces the highest amount of metallic contaminants. Also, the wear rate of the grinding disc was also determined with respect to the grinding time. The results show that the wet form has the highest amount of metallic contaminants of about 1.397 g followed by the paste form with 1.075 g. The dry form has the least value corresponding to 0.945 g. The grain sizes of the metallic contaminants were calculated to be 12.095 nm for the wet form, 8.056 nm for paste form while the dry form has the smallest grain size of 3.124 nm. The results revealed that metallic contaminants are always contained in grinded food processed with local grinding discs. Thus, materials with better wear resistance should be selected for production of grinding discs to be used for food processing.Item EFFECT OF HEAT TREATMENT ON HARDNESS AND WEAR RESISTANCE OF A FAILED AUTOMOBILE BRAKE DISC(ACTA TEHNICA CORVINIENSIS – Bulletin of Engineering, Faculty of Engineering - Hunedoara, University POLITEHNICA Timisoara, 2014) Odusote, Jamiu Kolawole; Talabi, Segun Isaac; Agodinrin, GIn an attempt to improve the wear resistance of a failed automobile brake disc, different type of heat treatment operation was carried out on the samples of the disc. The samples were heated to 840°C 860°C and 880°C in a muffle furnace, and quenched in water, palm oil and air, separately. Water and oil quenched samples were later tempered at 200°C. The chemical composition of the failed brake disc was obtained by an optical emission spectrometer (OES), while the hardness value was measured using Brinell hardness testing machine. The highest Brinell hardness value of 331 BHN was obtained from the water-quenched sample heated to 880°C. The hardness values of the oil-quenched samples surpass that of air-quenched samples. The tempered samples displayed lower hardness values compared with the hardened samples, although the sample heat treated at 880°C, water-quenched and tempered still possesses high hardness value. The reduction in hardness of most of the samples after tempering suggests possible increase in ductility and toughness. As a result of the heat treatment and subsequent quenching, the retained austenite in the samples transforms to martensite, while the ferrite, flakes of graphite, and cementite were restructured. This shows that the brake disc could be hardened and tempered to obtain optimum hardness with improved ductility and toughness. This will result in better wear resistance, increase service life, and thus reduce brake failure and other related transportation hazard.Item EFFECT OF HEAT TREATMENT ON WEAR RESISTANCE OF A GRINDING PLATE(African Journal of Science and Technology, 2013) Odusote, Jamiu Kolawole; Talabi, Segun Isaac; Balogun, SThe effects of heat treatment on the hardness and by extension the wear resistance of locally produced grinding plate of known composition were investigated. Specimens were prepared from the grinding plate and were heat treated at 840°C, 860°C and 880°C and quenched at different rate. Some of the specimens were quenched in water and palm oil, while some of the quenched specimens were tempered at 200°C. The results obtained were corroborated with the microstructure of the specimens examined under an optical microscope. The hardness values of the grinding plate specimens quenched in various media increased with increased heat treatment temperatures, and are higher than that of the as-cast specimen. Water quenched tempered specimens (WT) displayed higher hardness values than the as-cast, whereas oil quenched tempered specimens (OT) possessed lower hardness values. The presence of carbide was evident on the micrographs of the water quenched specimens at all the exposure temperatures, which corroborated the observed increased in the hardness values with increased heat treatment temperatures. However, there was significant reduction in the hardness value of the water quenched tempered specimens compared with the quenched specimens, which indicates a significant improvement in toughness. Thus, water quenched and tempered specimen with relatively high hardness value and improved toughness, will be suitable for use as grinding plate because of its relatively better wear resistance. The hardness of the specimens was found to depend on the formation of carbide precipitates within the matrix structure. There is also possibility of production of structure consisting of graphite embedded in a martensitic matrix through the heat treatment.Item Preparation of Silica from Cassava Periderm(Widner University, USA, 2016-08) Adepoju, A. D.; Adebisi, Jeleel Adekunle; Odusote, Jamiu Kolawole; Ahmed, Ismaila Idowu; Hassan, S. BolajiCassava peel is a substantial by-product of cassava processing and it constitutes about 13% of the crop. Cassava peel is still currently considered a waste often discarded into the environment indiscriminately, and therefore economically underutilized. In the present work, silica was synthesized from cassava periderm via sol gel route. Cassava periderm was burnt at 600 oC to obtain Cassava Periderm Ash (CPA) prior to alkaline leaching of the silica content which was thereafter precipitated with acid. The silica aquagel was then prepared by pH controlled titration and aging, and followed by drying to form silica. Quantitative analysis showed that silica yield from CPA was 61.53%. The morphology, elemental composition and phases of the silica were investigated with SEM, EDX and XRD respectively. SEM revealed that silica particles are small but not uniform. The EDX compositional analysis confirmed the presence of Si silicon among others present. The Sherrer’s equation used to evaluate the particle size showed that the aver- age particle size of the silica was 62.69 nm. The silica obtained could be used as desiccant in the laboratory, and industrially, as filler for polymer composites and feedstock for production of silicon used in the manufacture of solar panel.Item REVIEWING ENGINEERING CURRICULA TO MEET INDUSTRIAL AND SOCIETAL NEEDS(Proceedings of 2014 International Conference on Interactive Collaborative Learning (ICL), IEEE, 2014-12) Talabi, Segun Isaac; Odusote, Jamiu Kolawole; Alabi, Abdulganiyu Funsho; Olorunmaiye, John AdesijiThe present state of engineering practices in our country has called for review of engineering curricula to make it more proactive and relevant to the industrial and societal needs. It is imperative that students be shown the difference between studying engineering and becoming an engineer. There is need for strong industrial interaction in our education for the students to know the types of problems engineers face, the concepts, processes, and tools they use to solve those problems, and the personal and professional attributes essential to be a team player in solving engineering problems. An attempt was made to evaluate all these variables in this paper.Item Stress corrosion cracking of austenitic stainless steel in chloride environment(Nigerian Journal of Engineering, Faculty of Engineering, Ahmadu Bello University, 2015-03) Ahmed, Ismaila Idowu; Alabi, Abdulganiyu; Odusote, Jamiu Kolawole; Aremu, Ishaq; Adebisi, Jeleel Adekunle; Yahaya, Taiwo; Talabi, Segun Isaac; Yahya, Raheem; Lyon, S. B.This study was carried out to assess the effect of applied potentials on stress corrosion cracking (SCC) of Austenitic Stainless Steel (ASS). Type 304L in a potentiostatically controlled chloride environment at ambient temperature. The stress corrosion cracking tests were carried out on annealed ASS using a Slow Strain Rate Test (SSRT) technique in sodium chloride solution acidified with hydrochloric acid at ambient temperature. Analyses of failed specimens were carried out using optical microscope. The study showed that plastic elongation, ultimate tensile strength and time to failure decrease as the applied potential increases during the slow strain rate test. The study showed that immunity of ASS to chloride SCC was improved when the electrochemical potential was maintained in the primary passive potential range. Analysis of failed samples showed evidences of SCC.Item Stress Corrosion Cracking of Austenitic Stainless Steel in Chloride Environment(Faculty of Engineering, Ahmadu Bello University Zaria, 2015) Ahmed, Ismaila Idowu; Alabi, Abdul Ganiyu Funsho; Odusote, Jamiu Kolawole; Aremu, Ishaq Na'Allah; Adebisi, Jeleel Adekunle; Yahaya, Taiwo; Talabi, Segun Isaac; Yahya, Raheem Abolore; Lyon, Stuart B.This study was carried out to assess the effect of applied potentials on stress corrosion cracking of Austenitic Stainless Steels (ASS), Type 304L in a potentiostatically controlled chloride environment at ambient temperature. The stress corrosion cracking tests were carried out on annealed ASS using a Slow Strain Rate Test (SSRT) technique in sodium chloride solution acidified with hydrochloric acid at ambient temperature. Post-mortem analyses of failed specimens were carried using optical microscopy. The study showed that plastic elongation, ultimate tensile strength and time to failure decrease as the applied potential increases during the slow strain rate test. The study showed that immunity of ASS to chloride SCC was improved when the electrochemical potential was maintained in the primary passive potential range. Post-mortem analysis of failed samples showed evidences of SCC and ductile failure on the fracture surface.