109 research outputs found
Design and Construction of Parabolic Solar Heater Using Polymer Matrix Composite
A parabolic dish is a type of concentrating reflective device that uses the shape of a circular paraboloid to
collect or project energy such as light, sound, or radio waves. The parabolic reflector transforms an
incoming plane wave traveling along the axis into a spherical wave converging toward the focus. In this
work concentrating dish was moulded from polyester resin reinforced with fiber glass mat and inner
surface lined with Aluminum foil to increase the reflectivity. The design was made up of a moulded dish of
246cm diameter with a height of 58.2cm which has a concentration factor of 54.9. The collector was
mounted on a site with latitude 6 40 22.19 and longitude 3 09 47.12 and water at 270C was heated to
a temperature of 850C within 20 minutes
Electromechanical Systems in Building Services Engineering
There are myriad of electromechanical systems in domestics, commercial and industrial buildings. Part or most of
these systems hardware are hidden from the public though they do account for between 50% to 75% of the total
construction cost and take up to 15% of the building volume. This paper is aimed at enumerating their functions as a
prerequisite for designing (including modelling and simulation), selecting, integrating, managing and reduction in
energy usage. The electromechanical systems included in this paper are cold and hot water supplies, heating,
ventilation, air conditioning, drainage, sanitation, refuse and sewage disposal, gas, electricity, access control,
communication, oil installation, fire fighting and transportatio
Nigerian Capacity for the Development of Advanced Engineering Materials
This paper try to address the Nigeria capacity to develop advanced engineering
materials in the line of availability of raw materials, human resources, infrastructure
and appropriate technology. In conclusion, after dwelling on these topics, it was
found out that Nigeria has the capacity to start to produce advanced engineering
materials for national development.
1.0 Introduction
Nigeria as a nation is blessed with abundant of human and mineral resources. With
our population over 140 million (1), and about 100 universities and many other
tertiary institutions in the country, our ability to develop Advanced Engineering
materials should not arise at all. The question that should come to mind is, whether
the country is ready to venture into the world of advanced engineering material? This
is the answer this paper will try to address in the modest way by outline our capacity
as a nation to develop Advanced Engineering materials. Then what is advanced
Engineering Materials?
They are either traditional materials whose properties have been enhanced or they are
newly developed, high-performance materials and may cut across wide spectrum;
metal, ceramics, glass, and polymers. These advanced engineering materials are used
in high technology. Such materials can stand up to the high-temperature, highly
radioactive environment of a nuclear reactor, the appropriate wear and equipment for
the astronauts, heat-resistant ceramic tiles to enable the space shuttle to re-enter the
earth’s atmosphere without burning up, and semi conductors and multi-million chips
for sophisticated computer circuits and telecommunications equipment are examples
of such materials.
Without them, some of the greatest achievements we are witnessing in the developed
world today would not have been possible. The development has been possible
through the use of advanced engineering materials in form of composites,
superconductivities, super alloys, polymers, ceramics, optic fibres, and semi
conductors have revolutionized the developmental process in the world. Thes
Effect of alumina nano-particle size and weight content on the corrosion resistance of AA1070 aluminum chloride/sulphate solution
The effect of specific alumina (Al2O3) nano-particle sizes (500 nm and 80 nm) and weight content (5% and 10%) on the electrochemical characteristics and corrosion resistance of AA1070 monolithic aluminum alloy (1070AL) in 0.1 M H2SO4, 1.78% NaCl and 0.1 M H2SO4/1.78% NaCl solutions was evaluated by potentiodynamic polarization test, open circuit potential measurement and optical microscopy analysis. The composite specimens at 80 nm particle size generally had lower corrosion rates than their composite counterparts. Results showed the combined sulphate/chloride solution severely deteriorated the surface properties of 1070AL and the alumina aluminum matrix composites (1070AL/Al2O3) coupled with having the highest corrosion rate values. The extent of surface deterioration was relatively smaller for 1070AL/Al2O3 specimens. Corrosion pits and intergranular cracks were observed on the surface morphology of 1070AL and 1070AL/Al2O3 specimens in NaCl solution despite having the lowest corrosion rate values. Significant passivation behavior was observed the specimens during potential scanning despite their highly electronegative corrosion potentials. SO42− anions in H2SO4 solution did not cause any significant change on morphology of the aluminum specimens with respect to the corrosion rate values being the second highest by comparison. 1070AL/Al2O3 at 80 nm and 10% weight content had the lowest corrosion rate among the composites which was comparable to 1070AL in 0.1 M H2SO4 and 1.78% NaCl solution
Artificial Neural Network Prediction of Aluminium Metal Matrix Composite with Silicon Carbide Particles Developed Using Stir Casting Method
Aluminium matrix composites (AMCs) are range of advanced engineering materials used for a wide range of applications. AMCs consist of a non-metallic reinforcement incorporated into Aluminium matrix providing advantageous properties over base metal alloys.
In this paper, artificial neural network (ANN) is used to predict the micro-hardness, yield strength, tensile extension, modulus, ultimate tensile strength and stress, time to fracture, load at maximum extension, tenacity, electrical resistivity and conductivity. Information obtained from ANN model predictions can be used as guidelines during the conceptual design and optimisation of manufacturing processes; thus, reducing time and costs
Artificial Neural Network Prediction of Aluminium Metal Matrix Composite with Silicon Carbide Particles Developed Using Stir Casting Method
Aluminium matrix composites (AMCs) are range of advanced engineering materials used for a wide range of applications. AMCs consist of a non-metallic reinforcement incorporated into Aluminium matrix providing advantageous properties over base metal alloys.In this paper, artificial neural network (ANN) is used to predict the micro-hardness, yield strength, tensile extension, modulus, ultimate tensile strength and stress, time to fracture, load at maximum extension, tenacity, electrical resistivity and conductivity. Information obtained from ANN model predictions can be used as guidelines during the conceptual design and optimisation of manufacturing processes; thus, reducing time and costs
Design and construction of tilting furnace for producing aluminium matrix composites
Aluminium matrix composites (AMCs) are a range of advanced engineering materials that can be used for
a wide range of applications within the aerospace, automotive, biotechnology, electronic and sporting
goods industries. AMCs consist of a non-metallic rein~orcemeht (SiC) incorporated into Aluminium matrix
which provides advantageous properties over base metal (AI) alloys. These include improved thermal
conductivity, abrasion resistance, creop resistance, dimensional stability, exceptionally good stiffness-toweight
and strength-to-weight ratios and better high temperature performance. Oil fired 20 kG tilting
furnace with integral mixing mechanism was designed and constructed for the production of AMC. This
cost effective furnace can be used in cottage industries without electric power
Development of Aluminium Matrix Composites: A review
Aluminium matrix composites (AMCs) are a range of advanced engineering materials that can be used
for a wide range of applications within the aerospace, automotive, biotechnology, electronic and
sporting goods industries. AMCs consist of a non-metallic reinforcement (SiC, B4C, Si3N4, AlN, TiC, TiB2,
TiO2) incorporated into Aluminium matrix which provides advantageous properties over base metal (Al)
alloys. These include improved abrasion resistance, creep resistance, dimensional stability,
exceptionally good stiffness-to-weight and strength-to-weight ratios and better high temperature
performance. Fabrication of these advanced engineering materials through liquid state and solid state
routes are considered in this paper
The Development of Molecular-Based Materials for Electrical and Electronic Applications
Aluminum silicon carbide (AlSiC) metal matrix composite materials have a
unique set of material properties that are ideally suited for electronics, hence
the development of molecular-based materials (MBM) for the electrical and
electronic industries. The low material density of AlSiC (3 g/cm3) makes it
ideal for weight-sensitive applications such as portable devices over traditional
thermal management materials like copper molybdenum (10 g/cm3) and
copper tungsten (16 g/cm3). The aim of this work is to develop MBM for
electrical and electronic industries. Aluminum (99.66% C.P.) and silicon carbide
(SiC) particulates of 240 grit (45 lm), 320 grit (29 lm), 600 grit (9 lm)
and 1200 grit (3 lm) at 2.5% weight fraction were used to achieve the objective.
The aluminum was melted at 750�C for 25 min in a graphite crucible
tilting furnace designed for this work using oil as a firing medium. After
melting, a two-step mixing method of stir casting technique was adopted. The
cast samples were further analyzed for mechanical and electrical properties.
The electrical properties were carried out by using a 4-point probe machine.
The result showed that hardness increases at lower grit level, while the
electrical properties marginally increased at higher grit. It is therefore recommended
that, to make AlSiC composite materials for electrical industries,
the higher grit of SiC should be preferre
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