前驱物裂解法低温制备碳化硅陶瓷膜

Preparation of Silicon Carbide Ceramic Membrane in Low Temperature by Precursor Pyrolysis

将碳化硅(SiC)粉体和一定量聚碳硅烷(polycarbosilane,PCS)、蒸馏水、聚丙烯酰胺(polyacrylamide,PAM)、聚丙烯酸(polypropylene acid,PAA)混合球磨以制备水性SiC浆料并测定了SiC粒子的动电位及粘度;将浆料均匀涂在SiC支撑体上,在1100℃真空条件下烧成,制备了SiC陶瓷膜并测定陶瓷膜的孔径分布及纯水通量及观察其形貌。研究结果表明:涂膜所用的浆料在pH值为11左右时,SiC粒子动电位最大达到-40 m V,浆料表观粘度最小为20 m Pa·s,制备的陶瓷膜孔径大小集中在1μm左右,纯水通量达40 m3/(m2·h)。

Silicon carbide（ SiC） powder and a certain amount of polycarbosilane,distilled water,polyacrylamide,polypropylene acid were mixed together and milled to prepare the SiC aqueous slurry,while the dynamic potential and viscosity were simultaneously measured after obtaining the as-prepared sample. Then,the slurry was uniformly coated on a SiC support and synthesized under 1100 ℃ in vacuum condition to obtain the SiC ceramic membrane. The pore size distribution,water flux as well as morphology of the obtained SiC ceramic membrane were carefully tested. The experimental results indicate that the Zeta potential can maximum reach to-40 m V,the apparent viscosity minimum reach to 20 m Pa·s,the pore size of the as-prepared ceramic membrane concentrate in the 1 μm and the water flux capacity reach to 40 m^3/（ m^2·h） when the pH value of the coating slurry was fixed at 11.