烧成氛围对多孔碳化硅支撑体耐碱性能的影响

Macroporous silicon carbide (SiC) support was prepared via dry-pressing and sintering in different atmospheres using SiC as a raw material, ZrO₂ as a sintering aid and graphite as a pore-forming agent. The effect of calcination atmosphere (i.e., Air, Air-Ar, Air-N₂, Ar, and N₂) on the microstructure, porosity, pore size distribution, three-point bending strength, phase composition and the alkali resistance of SiC supports was investigated. The SiC support calcined in Air-Ar atmosphere displays the optimum comprehensive performance. The average pore size, porosity, three-point bending strength and pure water permeability of the SiC support are 1.9 μm, 45%, 40 MPa, and 165 m³∙m^-2∙h^-1∙MPa^-1, respectively. The three-point bending strength of such a support remains at 30 MPa after corrosion in 1% (mass fraction) NaOH (80℃) for 10 d.