Fabrication and characterization of cordierite-bonded porous SiC ceramics

Abstract A reaction bonding technique was used for the preparation of cordierite-bonded porous SiC ceramics in air from α-SiC, α-Al 2 O 3 and MgO, using graphite as the pore-forming agent. Graphite was burned out to produce pores and the surface of SiC was oxidized to SiO 2 at high temperature. With further increasing the temperature, SiO 2 reacted with α-Al 2 O 3 and MgO to form cordierite. SiC particles were bonded by the cordierite and oxidation-derived SiO 2 . The reaction bonding characteristics, phase composition, open porosity, pore size distribution and mechanical strength as well as microstructure of porous SiC ceramics were investigated. The pore size and porosity were strongly dependent, respectively, on graphite particle size and volume fraction. The porous SiC ceramics sintered at 1350 °C for 2 h exhibited excellent combination properties, the flexural strength of 26.0 MPa was achieved at an open porosity of 44.51%.