In this chapter we describe, in some detail, some CMCs that have found some commercial applications. The main attributes of CMCs are their high strength and modulus, low density and high-temperature use capability and a greater toughness than that of monolithic ceramics. In order to drive home some of these advantages of CMCs, we present some evidence in Fig. 11.1 [1].


Fracture Toughness Carbon Fiber Borate Glass Ceramic Matrix Composite Ceramic Tool 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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    You have recently been hired as a senior materials engineer by a Fortune 500 company that is entering into the business of fabrication of ceramic matrix composites. Your first job is to recommend some die materials for making hot-pressed ceramic composites. What items will you consider in choosing a die material?Google Scholar
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    One of the most common cutting tool materials is tungsten carbide with cobalt. Discuss the role of cobalt in this kind of composite.Google Scholar
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    Why does one not consider a cemented carbide material such as WC/Co, mentioned in the above problem, for structural purposes?Google Scholar
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    Carbon fibers have a negative axial coefficient of thermal expansion. Describe how carbon fiber-reinforced glass-ceramic composites can be produced with an almost zero in-plane expansion coefficient.Google Scholar
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    A very important application that will involve the use of various components made of ceramic matrix composites is the supersonic plane, US High Speed Civil Transport (HSCT) Plane. The HSCT plane will fly at 2.5–3.0 Mach and must maintain a low noise level and low emissions. Discuss the possible components of HSCT where CMCs may be used and explain why.Google Scholar
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    Discuss the problems involved in high temperature tensile testing of CMCs. Describe some of the possible solutions to these problems.Google Scholar
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    Carbon fiber reinforced composites are being used to make grips for high temperature testing of other ceramics and ceramic composites up to 2000°C in inert atmospheres. Explain why.Google Scholar
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    Many separation methods use membranes made of polymeric materials. These polymeric membranes provide excellent pore size disribution, but lack structural integrity and cannot be used at high temperatures.Google Scholar

Copyright information

© K. K. Chawla 1993

Authors and Affiliations

  • K. K. Chawla
    • 1
  1. 1.Department of Materials and Metallurgical EngineeringNew Mexico Institute of Mining and TechnologySocorroUSA

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