Abstract: The preparation of porous ceramics by pore-forming agent method has the advantage of green environmental protection, but how to balance the relationship between apparent porosity and compressive strength has become an important issue in the preparation porous ceramics. To address this issue, this study used silicon carbide (SiC) as aggregate, charcoal and industrial-grade guar gum particles as pore-forming agents, and optimized the process to prepare environmentally friendly and high-performance filter ceramics. By designing pore-forming agents with special morphology, adjusting the proportion of pore-forming agents in the slurry and optimizing sintering temperature, the apparent porosity and compressive strength of SiC porous ceramics were effectively balanced. The results show that when the number ratio of pore-forming agent particles with pore channels to those without pore channels is 1:3, the mass fraction of methylcellulose is 1.3%, and the sintering temperature is 1 450 ℃, the obtained SiC porous ceramics have an apparent porosity of 81.24% and a compressive strength of 1.29 MPa.

Key words: silicon carbide, porous ceramics, pore-forming agent method, compressive strength, apparent porosity, green environmental protection