Preparation of SiC composite ceramic filtration membrane materials by air spray technology

Silicon carbide composite ceramic filtration membrane materials were prepared by air spray technology. In this process, using some organic solvents such as glycerol, ethanol, etc to fabricate a stable, excellent dispersibility inorganic silicon carbide slurry. Using air spray technology and coating the filter membrane. According to some heat treatments that sintering temperature from1350℃ to1450℃ for 3h, we can prepare a well-distributed, jumbo size SiC ceramic composite filtration membrane. The effects of particle size of SiC, sintering temperature, different ceramic binders on SiC filtration membrane were investigated. Meanwhile, the reaction bonding characteristics, phase composition, flexural strength as well as microstructure of SiC composite ceramics filtration membrane were also investigated. It is demonstrated that 22.8μm silicon carbide sintered at 1450℃ will obtain a better performance. With particle size increases, silicon carbide porous ceramic surface oxide layer thinner prepared at the same temperature. When 15wt% ceramic binder was added, a flexural strength of 36.6MPa was achieved at an open porosity of 35.3%. Al(OH)₃ used as a ceramic binder is very suitable due to its outstanding connectivity and better uniformity.