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

• Published in: International journal of applied ceramic technology Vol. 10; no. 6; pp. 1023 - 1033
• Main Authors: Dey, Atanu, Kayal, Nijhuma, Chakrabarti, Omprakash, Innocentini, Murilo D. M., Chacon, Welton S., Coury, José R.
• Format: Journal Article
• Language: English
• Published: Malden Blackwell Publishing Ltd 01.11.2013; Wiley Subscription Services, Inc
• Subjects: Ceramics; Flexural strength; Modulus of rupture in bending; Penetration; Permeability; Permeation; Petroleum coke; Porosity; Silicon carbide; Temperature dependence
• ISSN: 1546-542X; 1744-7402
• DOI: 10.1111/j.1744-7402.2012.02847.x

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 MPa, and elastic modulus from 3.3 to 27.6 GPa. Air permeation behavior was studied at 26–650°C. At room temperature Darcian (k1) and non‐Darcian (k2) permeability parameters vary from 1.64 to 18.42 × 10−13 m2 and 0.58 to 2.95 × 10−7 m, respectively. Temperature dependence of permeability was explained from structural changes occurring during test conditions.