Advantages Of Metal Matrix Composites

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METAL MATRIX COMPOSITES Index • Introduction • Fabrication Methods • Properties of MMCs • Application of MMCs Introduction Metal matrix composites (MMCs) usually consist of a low-density metal, such as magnesium or aluminum, reinforced with particulate or fibers of a ceramic material, such as silicon carbide or graphite. Compared with unreinforced metals, MMCs offer higher specific strength and stiffness, higher operating temperature, and greater wear resistance, as well as the opportunity to tailor these properties for a particular application. Fabrication Methods A metal matrix composite is composite material which consists of two constituent parts, one being a metal, the other material may be a different metal or material such…show more content…
It is the simplest and cheapest technique of liquid state fabrication. It is then cast by conventional casting and is processed by conventional metal forming technologies. Discontinuous reinforcement is stirred into molten metal, which is allowed to solidify. • Pressure Infiltration: It is a method in which ceramic particles, fibers are woven in a molten matrix metal, and it further fills the space between the dispersed phase inclusions. The motive force is capillary force of dispersed phase or an external pressure. Molten metal is infiltrated into the reinforcement through use a kind of pressure such as gas pressure • Electroplating and electroforming: A solution containing metal ions loaded with reinforcing particles is co-deposited forming a composite material. It produces a coating from a 10 micrometer solution containing ion of the desired material in the presence of an electric current. Fibres are wounded • Squeeze casting: Molten metal is injected into a form with fibers pre-placed inside…show more content…
It consists of winding fibers onto a foil coated drum and spraying molten metal onto them to form a monotape. The source of molten metal may be powder or wire feedstock which is melted in a flame, arc or plasma torch. • Reactive processing: A chemical reaction occurs, with one of the reactants forming the matrix and the other the reinforcement. 3. In Situ Fabrication Method • Controlled unidirectional solidification of a eutectic alloy can result in a two-phase microstructure with one of the phases, present in lamellar or fiber form, distributed in the matrix. • In this technique the reinforcement phase is formed in situ. The composite material is produced in one step from an appropriate starting alloy, thus avoiding the difficulties inherent in combining the separate components. 4. Vapor Deposition • The fiber is passed through a thick cloud of vaporized metal, coating it. • It can be used to produce thin films and coatings. PVD is characterized by a process in which the material goes from a condensed phase to a vapor phase and then back to a thin film condensed

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