Transcript Document

Republic of Iraq
Ministry of Higher Education and Scientific Research
University of Technology
Production and Metallurgy engineering
Baghdad-Iraq
“Carbon nanotubes reinforced
aluminum nanocomposite via
plasma spray forming”
Mustafa K. Ismael
Metallurgical Engineering
Supervisors
Prof. Dr.Ahmad A. Mosa
Assist Prof. Dr. Mohammed I. Mohammed
May.2011
Introduction
The unique properties of carbon nanotubes can be exploited in metalmatrix composite (MMCs), because their exceptional resilience, carbon
nanotubes might be practically desirable as reinforcement for (MMCs).
Why Al-Si composites?
high strength, high stiffness, wear and corrosion resistance.
Aerospace, automobile, electronic industries, defense.
 Aluminum matrix composite reinforced by CNTs.
• Thermal spray
• EPD.
• Other cold processes (supersonic spray).
Aim of this Work
 Preparation of nanocomposite coating
layer, and investigate of their mechanical
and physical properties.
Proposed Research
1- Synthesis CNTs
 Arc-discharge
Vaporization of carbon between two graphite
electrodes, at pressure of Helium or/and
Argon ~500 Torr, current supply between
small gap 50-200 A, at ~20V.
 CVD
2- Purification process
Nanotubes are contaminated with catalyst
particles and support material.
3- Mixing
Purified CNTs with deferent amount blended with
powder of Aluminum-Silicon hypereutectic alloy.
4- composite coating
a-Plasma spry
Al-Si alloy with different amount of CNTs spray by
Arc-plasma, on substrate of series 6000 aluminum.
b- Electrophoretic deposition (EPD)
5- Examination and Tests
 SEM, TEM, AFM, XRF, XRD
 Nanoindentation to evaluate hardness and elastic
modulus.
 Bending test to evaluate bond coat strength .
 Other such as; thermal conductivity.
Research Problem
1-Thermal process is limited spraying of
nanocomposite material because of high
tendency to form clogs at plasma gun
nozzle.
 solution precursor plasma spray process (SPPS) to
enhanced this elimination.
2- Coating of aluminum substrate is restricted
to cold process, so other thermal process
such as CVD are excluded.
a