Browsing by Author "Alabi, A. G. F."
Now showing 1 - 3 of 3
Results Per Page
Sort Options
Item Enrichment of a Nigerian Calcite ore for Hydroxyapatite production(Australian Ceramic Society, 2016-10-20) Baba, A. A.; Womiloju, A. A.; Joda, A.; Lawal, A.; Babamale, H. F.; Alabi, A. G. F.; Adekola, F. A.In this study, Hydroxyapatite (HAp) powders have been prepared from Calcite ore of Nigerian origin using diammonium hydrogen phosphate as the Phosphorus source via hydrothermal method. The HAp powders formed is used to determine the chemical structure and nature of HAp crystals at different reaction temperature and time of operation were characterized by X-ray Fluorescence (XRF), X-ray Diffraction (XRD), Scanning Electron Microscope (SEM) coupled with Energy Dispersive X-ray (EDS) and Fourier Transform Infra-red (FT-IR) techniques. Using a set of experimental conditions, different morphology, crystallinity and stoichiometric ratios were obtained. At optimal conditions (1M (NH4)2HPO4, 850C, 6 hours reaction time), a rectangular, rod-like and layered HAp crystal formed yielded Ca/P molar ratio of 1.66 which is close to the stoichiometric HAp ratio of 1.67 required for biomedical applications.Item Flexural Performances of Epoxy Aluminium Particulate Composites(Faculty of Engineering, Chulalongkorn University, Thailand, 2018) Bello, S. A.; Agunsoye, J. O.; Adebisi, J. A.; Raji, N. K.; Adeyemo, R. G.; Alabi, A. G. F.; Hassan, S. B.Polymers are characterised with lightness, ease of formability and resistance to chemical attack but their modulus and strength are low. Epoxy was reinforced with aluminium particles of different sizes. Bond, functional group and chemical formulae of the composite phases were examined using Fourier Transform Infrared Spectroscopy (FTIR) and X-ray diffractometer. The flexural test was also conducted on the developed composites via three-point method. Analysis of variance (ANOVA) was performed using aluminium percentage by weight (wt%) and sizes (Ps) as the predictor variables. Results indicated different chemical formulae of the composite phases. A maximum of 124.44 % increase in flexural modulus was found at 12 wt% reinforcement addition. Probability value, 0.000 for each of wt% and Ps affirm evenly significant influence of both variables on flexural modulus of the composites. Hence, the developed multiple regression model can be used for predicting the flexural modulus of epoxy particulate composites within and outside the scope of experiment.Item Stress corrosion cracking of austenitic stainless steels in chloride environment(Faculty of Engineering, Ahmadu Bello University, Zaria, Nigeria, 2015) Ahmed, I. I.; Alabi, A. G. F.; Odusote, J. K.; Aremu, I. N.; Adebisi, J. A.; Yahaya, T.; Talabi, S. I.; Yahya, R. A.; Lyon, S. B.This study was carried out to assess the effect of applied potentials on Stress Corrosion Cracking (SCC) 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. 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.