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以SiC粉体(D_(50)=10.38μm)为主要原料,添加少量堇青石、Al_2O_3、石墨,通过凝胶注模法制备堇青石、莫来石结合的SiC复相陶瓷管状支撑体。研究了堇青石、石墨造孔剂添加量、烧结温度等对支撑体物相组成及显微结构、孔隙率、孔径分布、抗弯强度等性能的影响。结果表明:当碳化硅含量为70%(质量分数),堇青石、Al_2O_3、石墨添加量均为10%时,支撑体孔隙率达到42.84%,抗弯强度为40.3 MPa。在1 400℃烧结温度下,可获得SiC为主晶相、堇青石和莫来石为次晶相的三相共存陶瓷支撑体。支撑体具有连通的孔结构,孔径分布范围从0.66到3.22μm,适合作为陶瓷膜的基体。
SiC powder (D_ (50) = 10.38μm) was used as the main raw material, a small amount of cordierite, Al_2O_3 and graphite were added to prepare SiC composite ceramic tubular supports with cordierite and mullite by gel casting. The effects of cordierite, graphite pore-forming agent and sintering temperature on the phase composition, microstructure, porosity, pore size distribution and flexural strength were studied. The results show that the porosity of support is 42.84% and the bending strength is 40.3 MPa when the content of silicon carbide is 70% (mass fraction), cordierite, Al_2O_3 and graphite are all 10%. At the sintering temperature of 1400 ℃, three-phase coexisting ceramic support with SiC as the main crystalline phase, cordierite and mullite as the secondary crystalline phase can be obtained. The support has an interconnected pore structure with pore size distribution ranging from 0.66 to 3.22 μm, suitable as a matrix for ceramic membranes.