Fabrication of Open-Cell, Microcellular Silicon Carbide Ceramics by Carbothermal Reduction
Abstract:A novel processing route for developing open-cell, microcellular SiC ceramics has been developed. The strategy adopted for making microcellular SiC ceramics involved the following: (i) fabricating a formed body from a mixture of polysiloxane, phenol resin (used as a carbon source), polymer microbeads (used as sacrificial templates), and Al2O3–Y2O3 (an optional sintering additive); (ii) cross-linking the polysiloxane in the formed body; (iii) transforming the polysiloxane and phenol resin by pyrolysis into silicon oxycarbide and C, respectively; and (iv) synthesizing SiC by carbothermal reduction. By controlling the microbead and additive contents, it was possible to adjust the porosity so that it ranged from 60% to 95%.
Document Type: Communications
Affiliations: 1: Department of Materials Science and Engineering, The University of Seoul, Seoul 130-743, Korea 2: Ceramic Materials Group, Korea Institute of Machinery and Materials, Changwon, Gyeongnam 641-010, Korea 3: Microcellular Plastics Manufacturing Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, ON, Canada M5S 3G8
Publication date: October 1, 2005