Evaluation of Air Permeation Behavior of Porous SiC Ceramics Synthesized by Oxidation‐Bonding Technique

Porous SiC ceramics were synthesized by oxidation bonding of compacts of commercial α‐ SiC powder at 1300°C. Different volume fractions of petroleum coke powder were used for variation of porosity of ceramics from 36% to 56%. The material exhibited variations of pore size from 3 to 15 μm, flexural strength from 5.5 to 29.5 MP a, and elastic modulus from 3.3 to 27.6 GP a. Air permeation behavior was studied at 26–650°C. At room temperature D arcian ( k 1 ) and non‐ D arcian ( k 2 ) permeability parameters vary from 1.64 to 18.42 × 10 −13 m 2 and 0.58 to 2.95 × 10 −7 m, respectively. Temperature dependence of permeability was explained from structural changes occurring during test conditions.