Porous ceramics are a concept proposed relative to dense ceramics, porous ceramics have a high porosity, and the material has a large number of pores that are the same or closed to each other. By regulating different production parameters and conditions, it can produce different numbers, different sizes, and different shapes of pores inside, resulting in a unique porous structure.
Porous ceramics because of its large porosity, it not only has the advantages of high chemical stability, high temperature resistance, corrosion resistance and high strength of ordinary ceramic materials, but also has the new characteristics of small bulk density, large specific surface area and high porosity, which makes it widely used in food and beverage, chemical separation; biological, textile, pharmaceutical and other chemical production processes; automobile exhaust gas purification, molten metal filtration; high temperature hot gas filtration.
In the formulation of porous ceramics, the use of fumed silica can improve and alleviate the existing problems of high pressure drop and high thermal expansion coefficient, while solving the problem of low qualification rate in the preparation process, significantly reducing production costs and improving production efficiency.
Fumed silica is a high purity, large specific surface area, high temperature resistance, non-toxic and non-polluting green environmental protection new materials, the material has a relatively excellent pore effect because of its loose and porous structure, while the content of silica in the material is higher, silica is also a component of the iolite material, so, fumed silica as an inorganic porous agent, its use has reached the purpose of porousing, while reducing the amount of pore agent, the most important thing is to significantly improve the firing pass rate of the product, Greatly reduce the production costs and improve the production efficiency. It realizes the two functions of one material, and makes the product have the characteristics of low pressure drop and low coefficient of thermal expansion.