MMC Composites

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Accompanying the development of the mechanical industry, the demands for composite materials having high hardness, strength, wear resistance, and corrosion resistance are increasing. MMC is one of the new materials finding a lot of scope to meet the mechanical industry’s demand. Research has been carried out in MMC composites over several years, by researchers on fabrication methods and material property estimations, and many excellent research results have been obtained. All MMCs have a metal or a metallic alloy as the matrix. The reinforcement can be metallic or ceramic [1]. In particulate MMCs, various materials are combined with one another to get the intended properties. The obtained properties are different from those of the base materials. Such composite materials make this concept true, and reinforcement in a matrix of this material contributes to the enhancement of the properties. But, neither the matrix nor the reinforcement by itself, but only the MMC can fulfil the requirements. The application of particulate MMCs is unlimited in the field of aerospace, defense, transportation, recreation, sports and numerous other commercial and consumer products [2]. A wide range of metals and their alloys may be used as matrix materials to make MMCs. The most important are aluminum, titanium, magnesium, copper alloys, and super alloys. Titanium has a great affinity for oxygen, nitrogen, and hydrogen. Parts per million of such interstitials in titanium can change the mechanical properties drastically. In particular, micro structural changes may result in severe brittleness [3]. The problem of Magnesium alloy is a hexagonal close-packed structure, which gives it limited ability to deform plastically by slip, at room ... ... middle of paper ... ... coal bed makeup but may include one or more of the following elements or substances found in trace concentrations (up to hundreds ppm): arsenic, beryllium, boron, cadmium, chromium, hexavalent chromium, cobalt, lead, manganese, mercury, molybdenum, selenium, strontium, thallium, and vanadium, along with very small concentrations of dioxins and PAH compounds [4-7]. Lately most of the electric power plants in Bangladesh happen to be coal fed. As a result huge amount of fly ash is being produced which is a matter of concern for of course a waste management department. Waste utilization is the best option for pollution-prevention and during previous decades new doors have been opened for fly ash utilization in various sectors like manufacture of cement, bricks, pavement materials, floor tiles, composite materials and wall panels; in agriculture, road construction etc.
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