**5. Mechanical behavior of porous ceramic**

The general properties for porous ceramics can be designed for specific environmental application by controlling their composition and microstructure [16]. Changes in open and closed porosity, distribution of pore size and shapes of pore can have a main effect on the properties of porous ceramics. All of these microstructural features are in turn greatly affected by the processing way used to produce of the porous ceramic. For mechanical properties of porous ceramics, they are determined by their structural parameters, such as percentage of porosity, pore size, and shape. Furthermore, the solid microstructure phase of grain growth and solid phase continuity greatly affect the mechanical properties. Several important issues relating to the growth of the neck touching particles by surface and volume diffusion can significantly increase the mechanical properties with minimal increase in density. The microstructure in porous ceramics can be controlled not only by adjusting the particle size and shape of the initial raw powders, but also through the process of sintering.
