The Experts below are selected from a list of 120 Experts worldwide ranked by ideXlab platform
G. I. Lawal - One of the best experts on this subject based on the ideXlab platform.
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Study of Wear, Hardness and Fractography of Millscale Reinforced Ceramic Matrix Composites
Journal of the Institute of Engineering, 2019Co-Authors: Stephen Durowaye, O. I. Sekunowo, G. I. LawalAbstract:Ceramic matrix composites were developed by powder metallurgy and the blended matrix was reinforced with Millscale particles from 3-18 wt.% at particles size distribution of 106-250 μm. Microstructural, hardness and wear characterisations were carried out on the composites using standardised methods. The results showed that the 106 μm Millscale particles reinforced composite exhibited desirable hardness value of 124 BHN, low wear rate of 1.99 x 10-6 g/m and appreciable high wear resistance indicating a potential for effective performance in service. The composites worn surfaces revealed abrasion, adhesion and grooves formation. These features derived from the composites microstructure formed the basis on which enhancement procedures could be developed.
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Synthesis and characterisation of iron Millscale particles reinforced ceramic matrix composite
Elsevier, 2019Co-Authors: O. I. Sekunowo, S. I. Durowaye, G. I. LawalAbstract:A promising sintered particulate ceramic matrix composite suitable for automobiles and aircrafts brake pad application was developed by powder metallurgy method in an attempt to enhance the performance and service life of the brake pad. The detailed methodology involves using formulation of 30 wt% silica, 40 wt% magnesia, and 30 wt% bentonite as matrices. The blended matrix was reinforced with iron Millscale particles which varied from 3 to 18 wt% at particles size distribution (106–250) µm. The developed composites were subjected to physical, mechanical, thermal, wear, and microstructural characterisations using Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM/EDS). Microstructure of the composite shows a uniform distribution of Millscale particles in the ceramic matrix with a strong interfacial bonding between the particles. The composite exhibits desirable properties in terms of density (2.06 g/cm3), hardness (124 BHN), impact energy (4.61 J), compressive strength (143.67 MN/m2), shear strength (5.78 MN/m2), thermal conductivity (0.39 W/mK), and wear rate (1.91 × 10−6 g/m). These values compare well with the properties exhibited by conventional/commercial brake pads indicating a potential for effective performance in service. Keywords: Iron Millscale, Ceramic matrix composite, Brake pad, Characterisation
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thermal and tribological characterizations of Millscale particles reinforced ceramic matrix composites
Journal of Taibah University for Science, 2018Co-Authors: Stephen Durowaye, O. I. Sekunowo, G. I. Lawal, I. A. RaheemAbstract:This paper evaluates some basic functional properties of iron-Millscale-reinforced ceramic matrix composites (CMCs) as potential material for automobiles and aircraft brake pads’ applicatio...
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Thermal and tribological characterizations of Millscale-particles-reinforced ceramic matrix composites
Taylor & Francis Group, 2018Co-Authors: S. I. Durowaye, G. I. Lawal, O. I. Sekunowo, I. A. RaheemAbstract:This paper evaluates some basic functional properties of iron-Millscale-reinforced ceramic matrix composites (CMCs) as potential material for automobiles and aircraft brake pads’ application. The particulate CMCs were produced by the powder metallurgy method. Iron Millscale particles’ addition varied from 3 to 18 wt.% in a matrix comprising a mixture of silica, magnesia and bentonite. After sintering, the composites were subjected to coefficient of friction (COF), wear, thermal and microstructural characterizations. Microstructure of the composites showed a uniform distribution of Millscale particles in the ceramic matrix with a strong interfacial bonding between the particles. The composites demonstrated a comparatively high resistance to wear, appreciable COF (0.506–0.561) and a modest thermal conductivity (0.39–0.53 W/m K) coupled with high thermal stability. Contributions to these superlative performances were provided by the high level of friction induced on composites’ surfaces and strong interfacial bonding developed during sintering
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synthesis and characterisation of iron Millscale particles reinforced ceramic matrix composite
Journal of King Saud University: Engineering Sciences, 2017Co-Authors: O. I. Sekunowo, Stephen Durowaye, G. I. LawalAbstract:Abstract A promising sintered particulate ceramic matrix composite suitable for automobiles and aircrafts brake pad application was developed by powder metallurgy method in an attempt to enhance the performance and service life of the brake pad. The detailed methodology involves using formulation of 30 wt% silica, 40 wt% magnesia, and 30 wt% bentonite as matrices. The blended matrix was reinforced with iron Millscale particles which varied from 3 to 18 wt% at particles size distribution (106–250) µm. The developed composites were subjected to physical, mechanical, thermal, wear, and microstructural characterisations using Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM/EDS). Microstructure of the composite shows a uniform distribution of Millscale particles in the ceramic matrix with a strong interfacial bonding between the particles. The composite exhibits desirable properties in terms of density (2.06 g/cm 3 ), hardness (124 BHN), impact energy (4.61 J), compressive strength (143.67 MN/m 2 ), shear strength (5.78 MN/m 2 ), thermal conductivity (0.39 W/mK), and wear rate (1.91 × 10 −6 g/m). These values compare well with the properties exhibited by conventional/commercial brake pads indicating a potential for effective performance in service.
O. I. Sekunowo - One of the best experts on this subject based on the ideXlab platform.
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Study of Wear, Hardness and Fractography of Millscale Reinforced Ceramic Matrix Composites
Journal of the Institute of Engineering, 2019Co-Authors: Stephen Durowaye, O. I. Sekunowo, G. I. LawalAbstract:Ceramic matrix composites were developed by powder metallurgy and the blended matrix was reinforced with Millscale particles from 3-18 wt.% at particles size distribution of 106-250 μm. Microstructural, hardness and wear characterisations were carried out on the composites using standardised methods. The results showed that the 106 μm Millscale particles reinforced composite exhibited desirable hardness value of 124 BHN, low wear rate of 1.99 x 10-6 g/m and appreciable high wear resistance indicating a potential for effective performance in service. The composites worn surfaces revealed abrasion, adhesion and grooves formation. These features derived from the composites microstructure formed the basis on which enhancement procedures could be developed.
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Electrical and Thermal Characterisation of Millscale Modified Sn-Cu Lead-Free Solders
Journal of the Institute of Engineering, 2019Co-Authors: O. I. Sekunowo, Stephen Durowaye, Gbenga FashakinAbstract:Lead-free solders are gaining much attention as a result of legislation against the inclusion of lead and other hazardous materials in solders used in joining electronic components. This study investigated the effect of iron Millscale (IMS) modified tin-copper (Sn-Cu) alloy on the electrical resistivity, electrical, and thermal conductivities of the solder samples under increasing applied current. The input materials consist of tin, zinc and iron Millscale while the copper was varied from 0.2 – 1.0 wt. %. Fabrication of the alloy employed metal casting technique followed by relevant test samples preparation for characterisation in terms of microstructure, electrical, and thermal conductivities. Results show that the sample with 1 wt. % Cu addition exhibited the highest electrical and thermal conductivity values of 9967.9 S/m and 11.24 x 10-5 W/mK respectively at applied current value of 600 A with the lowest resistivity of 1 x 10-4 (Ωm). The solder alloy microstructure confirmed the presence of Cu6Sn5-FeO intermetallic phase dispersed in Sn matrix forming a continuous network. Contribution to the overall desirable performance of the solder alloy may have stemmed from the strong and coherent inter-crystal cohesion between the Cu6Sn3 and FeO phases which resulted in improved electrical and thermal conductivities of the as cast solder. The grade of solder alloy fabricated is adjudged suitable for assembling electronic components in industrial plant control panels.
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effects of silicon carbide Millscale and magnesia particulates on the mechanical properties of hybrid unsaturated polyester resin matrix composites
Usak University Journal of Engineering Sciences, 2018Co-Authors: Stephen Durowaye, O. I. Sekunowo, Shola Shittu, Precious DuruAbstract:The efficacy of reinforcement of polyester resin matrix composites with hard ceramic particles for optimal performance was studied. 5-25 wt. % of silicon carbide, Millscale, and magnesia particles were applied in reinforcing unsaturated polyester resin matrix by mould casting and the microstructural and mechanical characteristics of the composites were evaluated. There was uniform distribution of silicon carbide, Millscale, and magnesia particles in the polymer composites matrix from the scanning electron microscopy (SEM) result. The highest mechanical properties in terms of ultimate tensile strength (73.75 MPa), flexural strength (74.89 MPa), hardness (98.76 BHN), and impact energy (24.85 J) was exhibited by the hybrid composite at 15 wt. % reinforcement. This shows the efficacy of hybridisation and the high potential of the composite for wider applications.
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thermal and tribological characterizations of Millscale particles reinforced ceramic matrix composites
Journal of Taibah University for Science, 2018Co-Authors: Stephen Durowaye, O. I. Sekunowo, G. I. Lawal, I. A. RaheemAbstract:This paper evaluates some basic functional properties of iron-Millscale-reinforced ceramic matrix composites (CMCs) as potential material for automobiles and aircraft brake pads’ applicatio...
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behaviour of Millscale reinforced aluminium bronze composite
Nigerian Journal of Technological Research, 2017Co-Authors: O. I. Sekunowo, Stephen Durowaye, S. O. AdeosunAbstract:Despite the desirable characteristics exhibited by most aluminium bronze, the deficient responses in certain critical applications have necessitated improvement in the mechanical properties. The microstructural and mechanical properties of cast aluminium bronze reinforced with iron Millscale particles were investigated in this paper. Cast samples of the composite containing iron Millscale particles (2-10 wt. %) were homogenized at 11000 C for 10 minutes to relieve the as-cast structures. The homogenised samples were subjected to physical, mechanical, and microstructural properties characterisation. The highest ultimate tensile strength (UTS) of 643.8 MPa representing 10.1 % improvement over conventional aluminium-bronze was obtained at 4 wt. % iron Millscale particles reinforcement. Maximum impact resilience of 83.9 J and hardness value of 88.7 HRB were obtained at 4 wt. % reinforcement. This signals the birth of another viable means of Millscale utilisation hitherto considered a waste thereby boosting the global effort at achieving a cleaner environment.
Stephen Durowaye - One of the best experts on this subject based on the ideXlab platform.
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Study of Wear, Hardness and Fractography of Millscale Reinforced Ceramic Matrix Composites
Journal of the Institute of Engineering, 2019Co-Authors: Stephen Durowaye, O. I. Sekunowo, G. I. LawalAbstract:Ceramic matrix composites were developed by powder metallurgy and the blended matrix was reinforced with Millscale particles from 3-18 wt.% at particles size distribution of 106-250 μm. Microstructural, hardness and wear characterisations were carried out on the composites using standardised methods. The results showed that the 106 μm Millscale particles reinforced composite exhibited desirable hardness value of 124 BHN, low wear rate of 1.99 x 10-6 g/m and appreciable high wear resistance indicating a potential for effective performance in service. The composites worn surfaces revealed abrasion, adhesion and grooves formation. These features derived from the composites microstructure formed the basis on which enhancement procedures could be developed.
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Electrical and Thermal Characterisation of Millscale Modified Sn-Cu Lead-Free Solders
Journal of the Institute of Engineering, 2019Co-Authors: O. I. Sekunowo, Stephen Durowaye, Gbenga FashakinAbstract:Lead-free solders are gaining much attention as a result of legislation against the inclusion of lead and other hazardous materials in solders used in joining electronic components. This study investigated the effect of iron Millscale (IMS) modified tin-copper (Sn-Cu) alloy on the electrical resistivity, electrical, and thermal conductivities of the solder samples under increasing applied current. The input materials consist of tin, zinc and iron Millscale while the copper was varied from 0.2 – 1.0 wt. %. Fabrication of the alloy employed metal casting technique followed by relevant test samples preparation for characterisation in terms of microstructure, electrical, and thermal conductivities. Results show that the sample with 1 wt. % Cu addition exhibited the highest electrical and thermal conductivity values of 9967.9 S/m and 11.24 x 10-5 W/mK respectively at applied current value of 600 A with the lowest resistivity of 1 x 10-4 (Ωm). The solder alloy microstructure confirmed the presence of Cu6Sn5-FeO intermetallic phase dispersed in Sn matrix forming a continuous network. Contribution to the overall desirable performance of the solder alloy may have stemmed from the strong and coherent inter-crystal cohesion between the Cu6Sn3 and FeO phases which resulted in improved electrical and thermal conductivities of the as cast solder. The grade of solder alloy fabricated is adjudged suitable for assembling electronic components in industrial plant control panels.
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effects of silicon carbide Millscale and magnesia particulates on the mechanical properties of hybrid unsaturated polyester resin matrix composites
Usak University Journal of Engineering Sciences, 2018Co-Authors: Stephen Durowaye, O. I. Sekunowo, Shola Shittu, Precious DuruAbstract:The efficacy of reinforcement of polyester resin matrix composites with hard ceramic particles for optimal performance was studied. 5-25 wt. % of silicon carbide, Millscale, and magnesia particles were applied in reinforcing unsaturated polyester resin matrix by mould casting and the microstructural and mechanical characteristics of the composites were evaluated. There was uniform distribution of silicon carbide, Millscale, and magnesia particles in the polymer composites matrix from the scanning electron microscopy (SEM) result. The highest mechanical properties in terms of ultimate tensile strength (73.75 MPa), flexural strength (74.89 MPa), hardness (98.76 BHN), and impact energy (24.85 J) was exhibited by the hybrid composite at 15 wt. % reinforcement. This shows the efficacy of hybridisation and the high potential of the composite for wider applications.
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thermal and tribological characterizations of Millscale particles reinforced ceramic matrix composites
Journal of Taibah University for Science, 2018Co-Authors: Stephen Durowaye, O. I. Sekunowo, G. I. Lawal, I. A. RaheemAbstract:This paper evaluates some basic functional properties of iron-Millscale-reinforced ceramic matrix composites (CMCs) as potential material for automobiles and aircraft brake pads’ applicatio...
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behaviour of Millscale reinforced aluminium bronze composite
Nigerian Journal of Technological Research, 2017Co-Authors: O. I. Sekunowo, Stephen Durowaye, S. O. AdeosunAbstract:Despite the desirable characteristics exhibited by most aluminium bronze, the deficient responses in certain critical applications have necessitated improvement in the mechanical properties. The microstructural and mechanical properties of cast aluminium bronze reinforced with iron Millscale particles were investigated in this paper. Cast samples of the composite containing iron Millscale particles (2-10 wt. %) were homogenized at 11000 C for 10 minutes to relieve the as-cast structures. The homogenised samples were subjected to physical, mechanical, and microstructural properties characterisation. The highest ultimate tensile strength (UTS) of 643.8 MPa representing 10.1 % improvement over conventional aluminium-bronze was obtained at 4 wt. % iron Millscale particles reinforcement. Maximum impact resilience of 83.9 J and hardness value of 88.7 HRB were obtained at 4 wt. % reinforcement. This signals the birth of another viable means of Millscale utilisation hitherto considered a waste thereby boosting the global effort at achieving a cleaner environment.
Tan Tong Ling - One of the best experts on this subject based on the ideXlab platform.
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Synthesis and characterization of Mg–Ti substituted barium hexaferrite (BaMg_0.6Ti_0.6Fe_10.8O_19) derived from Millscale waste for microwave application
Journal of Materials Science: Materials in Electronics, 2019Co-Authors: Nurshahiera Rosdi, Muhammad Syazwan Mustaffa, Raba′ah Syahidah Azis, Syazana Sulaiman, Nor Hapishah Abdullah, Tan Tong LingAbstract:Mg–Ti substituted barium hexaferrite (BaMg_0.6Ti_0.6Fe_10.8O_19) nanoparticles prepared by using steel Millscale waste have been investigated towards the structural, magnetic and microwave properties. The samples were prepared using high-energy ball milling technique with the hematite (Fe_2O_3) as the raw utilized and processed from Millscale waste product. The peaks with a single phase hexagonal structure of BaMg_0.6Ti_0.6Fe_10.8O_19 are identified at 1000 °C revealed from X-ray diffraction analysis. Higher saturation magnetization, M _ s , with high crystallinity was observed in the sample due to the enhancement of superexchange interaction within the sample. The best maximum reflection loss of − 22.59 dB at the frequency and bandwidth of 9.42 GHz and 0.14 GHz was achieved in sample sintered at 1000 °C.
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Synthesis and characterization of Mg–Ti substituted barium hexaferrite (BaMg 0.6 Ti 0.6 Fe 10.8 O 19 ) derived from Millscale waste for microwave application
Journal of Materials Science: Materials in Electronics, 2019Co-Authors: Nurshahiera Rosdi, Muhammad Syazwan Mustaffa, Raba′ah Syahidah Azis, Syazana Sulaiman, Nor Hapishah Abdullah, Tan Tong LingAbstract:Mg–Ti substituted barium hexaferrite (BaMg0.6Ti0.6Fe10.8O19) nanoparticles prepared by using steel Millscale waste have been investigated towards the structural, magnetic and microwave properties. The samples were prepared using high-energy ball milling technique with the hematite (Fe2O3) as the raw utilized and processed from Millscale waste product. The peaks with a single phase hexagonal structure of BaMg0.6Ti0.6Fe10.8O19 are identified at 1000 °C revealed from X-ray diffraction analysis. Higher saturation magnetization, Ms, with high crystallinity was observed in the sample due to the enhancement of superexchange interaction within the sample. The best maximum reflection loss of − 22.59 dB at the frequency and bandwidth of 9.42 GHz and 0.14 GHz was achieved in sample sintered at 1000 °C.
Nor Hapishah Abdullah - One of the best experts on this subject based on the ideXlab platform.
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Synthesis and characterization of Mg–Ti substituted barium hexaferrite (BaMg_0.6Ti_0.6Fe_10.8O_19) derived from Millscale waste for microwave application
Journal of Materials Science: Materials in Electronics, 2019Co-Authors: Nurshahiera Rosdi, Muhammad Syazwan Mustaffa, Raba′ah Syahidah Azis, Syazana Sulaiman, Nor Hapishah Abdullah, Tan Tong LingAbstract:Mg–Ti substituted barium hexaferrite (BaMg_0.6Ti_0.6Fe_10.8O_19) nanoparticles prepared by using steel Millscale waste have been investigated towards the structural, magnetic and microwave properties. The samples were prepared using high-energy ball milling technique with the hematite (Fe_2O_3) as the raw utilized and processed from Millscale waste product. The peaks with a single phase hexagonal structure of BaMg_0.6Ti_0.6Fe_10.8O_19 are identified at 1000 °C revealed from X-ray diffraction analysis. Higher saturation magnetization, M _ s , with high crystallinity was observed in the sample due to the enhancement of superexchange interaction within the sample. The best maximum reflection loss of − 22.59 dB at the frequency and bandwidth of 9.42 GHz and 0.14 GHz was achieved in sample sintered at 1000 °C.
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Synthesis and characterization of Mg–Ti substituted barium hexaferrite (BaMg 0.6 Ti 0.6 Fe 10.8 O 19 ) derived from Millscale waste for microwave application
Journal of Materials Science: Materials in Electronics, 2019Co-Authors: Nurshahiera Rosdi, Muhammad Syazwan Mustaffa, Raba′ah Syahidah Azis, Syazana Sulaiman, Nor Hapishah Abdullah, Tan Tong LingAbstract:Mg–Ti substituted barium hexaferrite (BaMg0.6Ti0.6Fe10.8O19) nanoparticles prepared by using steel Millscale waste have been investigated towards the structural, magnetic and microwave properties. The samples were prepared using high-energy ball milling technique with the hematite (Fe2O3) as the raw utilized and processed from Millscale waste product. The peaks with a single phase hexagonal structure of BaMg0.6Ti0.6Fe10.8O19 are identified at 1000 °C revealed from X-ray diffraction analysis. Higher saturation magnetization, Ms, with high crystallinity was observed in the sample due to the enhancement of superexchange interaction within the sample. The best maximum reflection loss of − 22.59 dB at the frequency and bandwidth of 9.42 GHz and 0.14 GHz was achieved in sample sintered at 1000 °C.
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Synthesis of carbon nanotubefrom waste cooking oil catalysedby mill scale waste for development of flexible microstrip patch antenna
2018Co-Authors: Ismayadi Ismail, Muhammad Syazwan Mustaffa, Zulkifly Abbas, Mohd Nizar Hamidon, Intan Helina Hasan, Nor Hapishah AbdullahAbstract:The synthesis of carbon nanotube (CNT) using waste cooking oil (WCO) as green starting material was carried out in a floating catalyst thermal vapor deposition reactor by using Millscale waste which is iron oxide nanoparticles (IONP) as a catalyst. Their morphology, composition, mass of substance changes, Raman characteristics and electromagnetic (EM) wave absorption performance were measured by Field Emission Scanning Electron Microscope (FESEM), Energy Dispersive X-ray (EDX), Thermal Gravimetric Analysis (TGA), RAMAN spectroscopy and Vector Network Analyzer (VNA). Results indicated that iron nanoparticles were distributed on MWCNT surface with agglomeration, and MWCNT crucially affected the magnetic properties of iron nanoparticle. Samples which contain higher content of carbon as confirmed by Raman characteristic possess higher absorption value. The enhanced EM-wave absorption performance was mainly ascribed to the increased of interfacial polarization and dielectric loss that resulting from the introduction of MWCNT. The result illustrated that the introduction of MWCNT into magnetic materials can enable the efficient design of excellent patch antenna for wireless communication application.