Synthesis and characterization of aluminium-alumina composite
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Transcript of Synthesis and characterization of aluminium-alumina composite
Pamod Kumar BahidarGaurav Kumar JhaHariballabha Mahanta
Department of Metallurgical EngineeringGandhi Institute of Engineering and Technology,
Gunupur
Supervisor
Prof. Ajaya Kumar Pradhan
By
Al is the second most widely used material
Application range from simple house hold items to space
High electrical conductivity
High thermal conductivity
High oxidation resistance
Light weight
Low cost
Recyclability
Good ductility and formability
Impermeable and odorless
Reflectivity
Low hardness, strength and wear resistance
Low corrosion resistance under aggressive environment
High coefficient of friction or low lubricating property
Hence, limited applicability in the fields requiring a combination of properties as mentioned in advantages and disadvantages of aluminium
Alloying
Heat treatment
Composite formation
Formation of composite can develop many properties significantly such as hardness, wear resistance, lubricating property that is impossible by any heat treatment or alloying.
No solubility limitation of the second phase More than one kind of reinforcement can be
added to develop many properties Wide range of formation techniques available Application specific properties can be
developed by controlling the shape, size and amount of the second phase
Architecture
Decoration
Sign boards
Powder metallurgy produces near net shape components. The technique required few or no secondary operations.
Parts of powder metallurgy can be produced from high melting point refractory metals with less cost and difficulties.
The dimensional accuracy of components produced by this technique is quite good, therefore no further machining is not required.
This technique involves high Production Rate along with low Unit Cost. It can produce complicated forms with a uniform microstructure. Powder metallurgy has full capacity for producing a variety of alloying
systems and particulate composites. This technique has flexibilities for producing powder metallurgy parts with
specific physical and mechanical properties like hardness, strength, density and porosity.
By using powder metallurgy, parts can be produced with infiltration and impregnation of other materials to obtain special characteristics which are needed for specific application.
Powder metallurgy can be used to produce bi-metallic products, porous bearing and sintered carbide.
Powder metallurgy makes use of 100% raw material as no material is wasted as scrap during process.
Author Material Processing route
Major findings
Atik, 1998 Aluminium/ Alumina
Agitated casting Hardness, tensile strength and impact strength have been observed to decrease. However, wear resistance has been observed to increase.
Ahmad et al. 2007 Aluminium/Alumina
Powder metallurgy Hardness and density have been observed to increase with the increase in Al2O3 content.
Dhadsanadhep et al., 2008 Aluminium/ Alumina
Powder metallurgy With the increasing content of Al2O3 hardness has been observed to increase.
Luangvaranunt et al., 2010 Aluminum-4 mass%Copper/Alumina
Powder Forging The process resulted a heat treatable alloy with age hardenable characteristics.
Mahboob et al., 2011 Aluminium/ Alumina
Powder Metallurgy Hardness, strength and ductility has been observed to increase with the increase in Al2O3
up to 5 wt%.
Radhika et al., 2012 Aluminium/Alumina/Graphite
Stir casting Hardness, tensile strength and wear resistance have been observed to increase with the increase in Al2O3 content.
Qutub Aluminium 6061/ Alumina
Powder metallurgy The composite has been observed to retain 35% of its tensile strength at 300 oC. Strain to fracture has been observed to increase with the increase in temperature up to 250 oC.
Metal Powder (Al)
Blending
Cold Compaction
Sintering
Characterization
Al2O3
Greater strength
Improved stiffness
Reduced density(weight)
Improved high temperature properties
Controlled thermal expansion coefficient
Thermal/heat management
Enhanced and tailored electrical performance
Improved abrasion and wear resistance
Control of mass (especially in reciprocating applications)
Improved damping capabilities
E. Atik, Mechanical properties and wear strengths in aluminium-alumina composites, Materials and Structures 31 (1998) 418-422.
K.R. Ahamad, W.J. Lee, R.M. Zaki, M.N. Mazlee, M.W.M. Fitri, S.S. Rizam and J.B.Shamsul, The microstructure and properties of aluminium composite reinforced with 65 µm alumina particles via powder metallurgy, ICoSM (2007) 165-167.
C. Dhadsanadhep, T. Luangvaranunt, J. Umeda and K. Kondoh, Fabrication of Al/AL2O3 composite by powder metallurgy method from aluminium and rice husk ash, Journals of Metals, Materials and Minerals, 18 (2008) 99-102.
T. Luangvaranunt, C. Dhadsanadhep, J. Umeda, E. Nisaratanaporn and K. Kondoh, Aluminium-4 mass% copper/alumina composites produced from aluminium copper and rice husk ash silica powder by powder forging, Materials Transactions 51 (2010) 756-761.
H. Mahboob, S.A. Sajjadi and S.M. Zebarjad, Influence of nanosized Al2O3 weight percentage on microstructure and mechanical properties of Al-matrix composite, Institute of Materials, Minerals and Mining 54 (2011) 148-152.
N. Radhika, S. Subramanian, S. Venkat Prasat and B. Anandavel, Dry sliding wear behaviour of aluminium/alumina/graphite hybrid metal matrix composites, Industrial Lubrication and Technology 64 (2012) 359-366.
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