Processing and Characterization of Alumina/ Chromium Carbide Ceramic Nanocomposite [chapter]

Jow-Lay Huang, Pramoda Nayak
2011 Advances in Nanocomposite Technology  
Materials with nano-scale components as reinforcement phase are adding new dimensions to composite materials, thereby fascilating major improvement in functional and structural properties. Ceramic nanocomposites are the blends of different ceramic matrices with nanometer sized functional particles. The advantages of these nanocomposites include: improved mechanical properties, surface properties, decreased permeability to gases, water and hydrocarbons, higher thermal stability and heat
more » ... n temperature, higher chemical resistance, smoother surface appearance and higher thermal conductivity. The incorporation of only a few percent of nano-sized particles makes great property changes and formerly unachievable property combinations possible. The ceramic nanocomposites can be devided into into three types; intragranular composite, intergranular composite and nano/nano composite (Niihara, 1991) according to their microstructures. In intra and intergranular nano-composite, the nano-sized particles are dispersed mainly within the matrix grains or at the grain boundaries of the matrix, respectively. The aim of these composites is to improve the mechanical properties such as hardness, facture strength, toughness and also high temperature mechanical properties such as hardness, strength, creep and fatigue facture resistances. On the other hand, nano/nano composites are composed of the dispersoids and matrix grains within the nanometer size. The primary purpose of this type of nano-composite is to add new functions such as machinability and super plasticity like metals to ceramics.
doi:10.5772/17899 fatcat:4glxknleyzcazkaw52ngyagekm