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Content Introduction Ceramic Matrix Nanocomposites • Type of CMN • Processing Metal Matrix Nanocomposites • Type of MMN • Processing Introduction of Nanocomposites Nanocomposites- solid structures with nanometer-scale dimensional repeat distances between the different phases that constitute the structure Typically consist of: • Inorganic(host) solid containing an organic component or vice versa • OR consist of 2 or more inorganic/organic phases in some combinatorial form. Constraint- at least one of the phases or features be in nano size • Extreme example: can be porous media, colloids, gels and copolymers Introduction of Nanocomposites Core concept: • Combination of nano-dimensional phases with distinct differences in structure, chemistry and properties. Nanocomposites- can demonstrate different mechanical, electrical, optical, electrochemical, catalytic, and structural properties than individual component Multifunctional behavior often more than the sum of individual components. Why Nanocomposites? Efforts to develop high-performance ceramics for engineering applications: • Gas turbines • Aerospace materials • Automobiles and etc. Conventional processed ceramics pose many unsolved problems: • Relatively low fracture toughness & strength • Degradation mechanical properties at high T • Poor resistance to creep, fatigue and thermal shock Attempts to solve incorporating second phases Second phases Either: • Particulates • Platelets • Whiskers • Fibers Disappointment in the use of micron-size range fillers To solve the problem nano-size fillers • Passive control of microstructures by incorporating nanometer-size second-phase dispersions into ceramic matrices.
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