Foam ceramics are the new industrial ceramics with low volume density (0.25~0.65g/cm3), high porosity (60%~90%) and three-dimensional network and framework structure. And these ceramics possess the resistance to high temperature and corrosion, and the intercommunicating pores with big specific surface area and so on, so they are widely applied into the fields of metal fusion filtration, cleaning of high temperature smokes, filtration of chemical products, carriers and transference between light and heat etc.
Especially in the filtration of molten metal, some companies at home and abroad have developed the screen cloth and honeycomb ceramic chips with straight holes in casting system into current foam ceramic filters. The practice proves that the adoption of these filters can reduce the waste rate of casts, increase the mechanical property of casts, prolong the life of tools of cutting metal and reduce the comprehensive cost
