Chapter 7 Metal, Ceramic, and Carbon Matrix Composites

Chapter 7 Metal, Ceramic, and Carbon Matrix Composites - 7...

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7 Metal, Ceramic, and Carbon Matrix Composites In the earlier chapters of this book, we considered the performance, manufac- turing, and design issues pertaining to polymer matrix composites. In this chapter, we review the thermomechanical properties of metal, ceramic, and carbon matrix composites and a few important manufacturing methods used in producing such composites. The history of development of metal, ceramic, and carbon matrix compos- ites is much more recent than that of the polymer matrix composites. Initial research on the metal and ceramic matrix composites was based on continuous carbon or boron fibers, but there were difficulties in producing good quality composites due to adverse chemical reaction between these fibers and the matrix. With the development of newer fibers, such as silicon carbide or aluminum oxide, in the early 1980s, there has been a renewed interest and an accelerated research activity in developing the technology of both metal and ceramic matrix composites. The initial impetus for this development has come from the military and aerospace industries, where there is a great need for materials with high strength-to-weight ratios or high modulus-to-weight ratios that can also withstand severe high temperature or corrosive environments. Presently, these materials are very expensive and their use is limited to appli- cations that can use their special characteristics, such as high temperature resistance or high wear resistance. With developments of lower cost fibers and more cost-effective manufacturing techniques, it is conceivable that both metal and ceramic matrix composites will find commercial applications in automobiles, electronic packages, sporting goods, and others. The carbon matrix composites are more commonly known as carbon– carbon composites, since they use carbon fibers as the reinforcement for carbon matrix. The resulting composite has a lower density, higher modulus and strength, lower coefficient of thermal expansion, and higher thermal shock resistance than conventional graphite. The carbon matrix composites have been used as thermal protection materials in the nose cap and the leading edges of the wing of space shuttles. They are also used in rocket nozzles, exit cones, and aircraft brakes, and their potential applications include pistons in ß 2007 by Taylor & Francis Group, LLC.
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intern al combust ion engines , gas turbine compone nts, he at exchangers , and biomedi cal impl ants. 7.1 METAL MATRIX COMPOSITES The metal matrix composites (MMC) can be divided into four general categories: 1. Fiber- reinfo rced MMC con taining eithe r con tinuous or discont inuou s fiber reinf orcement s; the latt er are in the form of whiskers with a pproxi- mate ly 0.1 ± 0.5 m m in diameter and have a length-to- diame ter rati o up to 200.
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This note was uploaded on 01/16/2012 for the course MAE 582 taught by Professor Rw during the Fall '11 term at SUNY Buffalo.

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Chapter 7 Metal, Ceramic, and Carbon Matrix Composites - 7...

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