Ceramic Porous Materials

Uniquely porous these ceramic materials contain open cell structures that allow the free flow of liquid or gas.

Ceramic porous materials.

A ceramic material is an inorganic non metallic often crystalline oxide nitride or carbide material. Porous ceramics can replace metal plastic or fiber based components providing equal or higher levels of performance and extending the useful component life under harsh conditions. It is also resistant to organic solvents. Porous ceramics are categorized as those ceramics having high percentage porosity between 20 and 95.

Combining tightly toleranced pores with unique ceramic material properties enables applications not feasible before. Some elements such as carbon or silicon may be considered ceramics ceramic materials are brittle hard strong in compression and weak in shearing and tension. These materials composed of at least two phases like solid ceramic phase and the gas filled porous phase the gas content of these pores usually regulates itself to the environment as an exchange of gas with the environment is possible through pore channels. On the other hand some porous materials of conductive ceramics like zirconia and silicon carbide have been utilized in heat exchangers and heaters 13.

Up to 1000c for porous ceramic limited only by sealants gaskets and or hardware materials. In light of the differences among their materials there are several types of porous ceramics. They withstand chemical erosion that occurs in other materials subjected to acidic or caustic environments. Ceramic tiles are more porous and often have a higher water absorption rate.

This classification standard has not been adopted abroad because the rules about using porous materials vary widely from country to country. In alkaline solutions porous ceramics are resistant up to ph9. Because of the uniform color of material in unglazed porcelain tile small chips may not be as noticeable as they would be on a piece of ceramic tile. And ocordierite 25 ceramic foam is an important part of porous ceramics and the open.

Porous ceramics are resistant to most acids except for hydrofluoric acid and phosphoric acid. As is known from figure 1 the representative processes for making macroporous ceramics are 1 partial sintering 2 sacrificial fugitives 3 replica templates and 4 direct foaming. Porous ceramics are often used for chemical filtration and fluid separation.