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Manufacturing process for (intermediate modulus) IM Carbon fibre reinforced composites - Coursework Example

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Carbon fiber is a fiber comprising at least 90% of carbon and is manufactured by pyrolysis of an organic precursor fiber that is in an inert atmosphere. This production takes place in the following phases: spinning, oxidation and carbonization.
Acrylonitrile plastic powder is…
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Manufacturing process for (intermediate modulus) IM Carbon fibre reinforced composites
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Manufacturing Process of IM Carbon Fiber reinforced Composite Introduction Carbon fiber is a fiber comprising at least 90%of carbon and is manufactured by pyrolysis of an organic precursor fiber that is in an inert atmosphere. This production takes place in the following phases: spinning, oxidation and carbonization.
Spinning
Acrylonitrile plastic powder is combined with another plastic, such as methyl acrylate or methyl methacrylate, then is reacted with a catalytic agent in a solution polymerization procedure and results in a polyacrylonitrile plastic( Mazumdar, 2002.
The plastic then is spun into fibers via one of numerous dissimilar methods. In certain procedures, the plastic is combined with some chemicals and forced through minute jets into an element bath or stimulate chamber where the plastic congeals and hardens into fibers. This is alike to the procedure applied to give polyacrylic textile fibers. Alternatively, the plastic combination is heated and propelled via minute jets into a chamber where the solvents vaporize, and remains a solid fiber (Mazumdar, 2002). The spinning stage is significant since the internal atomic arrangement of the fiber is made during this procedure.
The fibers then are cleaned and strained to the preferred fiber breadth. The straining aids align the particles within the fiber and delivers the root for the creation of the firmly bonded carbon crystals after carbonization.
Stabilizing
Before carbonizing the fibers, they are chemically changed to transform their linear atomic bonding to a further thermally steady stepladder bonding. This is fulfilled by heating them in air to around 390-590° F for between 120 minutes. This grounds the fibers to take oxygen particles from the air and reposition their nuclear bonding arrangement. The steadying chemical reactions are composite and include numerous steps, several of which happen concurrently (Morgan, 2005)... They too produce their particular heat, which ought to be controlled to evade overheating the fibers. Commercially, the steadiness procedure uses a variation of apparatus and systems. In some courses, the fibers are drained via a sequence of heated chambers. In others, the fibers are passed over rollers at high temperatures and through beds of unattached materials seized in suspension by a movement of hot air. Some methods use heated air combined with some gases which chemically hasten the stabilization.
Carbonizing
After the stabilization, the fibers are then heated to a temperature of around 1,830-5,500° F for a number of minutes in a furnace full of a gas combination that does not comprise oxygen. The absence of oxygen avoids the fibers from burning at very high temperatures. Keeping the gas pressure in the furnace at higher temperatures as compared to the outside air pressure and the areas where the fibers go in and out the furnace are closed to avoid oxygen entrance. As the fibers are heated, they start to lose their atoms, that is non-carbon atoms plus a little carbon atoms, in the form of numerous gases comprising water vapor, ammonia, carbon monoxide, carbon dioxide, hydrogen and others(Morgan, 2005).. As these non-carbon atoms are ejected, the residual carbon atoms leads to tightly bonded carbon quartzes that are ranged more or less corresponding to the extended axis of the fiber. In certain procedures, two furnaces functioning at two dissimilar temperatures are utilized to healthier regulate the degree of heating through carbonization.

Carbonizing process
A picture for both stabilizing and spinning

References:
Morgan, P. (2005). Carbon fibers and their composites. Boca Raton: Taylor & Francis.
Singh, M. (2001). 25th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures, A[-B] January 21-27, 2001, Cocoa Beach, Florida. Westerville, Ohio: American Ceramic Society.
Mazumdar, S. K. (2002). Composites manufacturing: materials, product, and process engineering. Boca Raton, Fla.: CRC Press. Read More
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