Manufacturing of cellular beta-SiAlON/beta-SiC composite ceramics from cardboard

摘要

Light-weight, cellular beta-SiAlON/SiC ceramics were produced via dip-coating of an Al/Si-powder containing preceramic polymer slurry into corrugated cardboard. The coated cardboard preforms were pyrolyzed in Ar-atmosphere at 1200 degrees C, where the cellulose fibres decomposed into carbon. Simultaneously the Al/Si melt infiltrated into the porous carbon and formed beta-SiC. Subsequent nitridation at temperatures between 1200-1530 degrees C resulted in the formation of a beta-SiC-containing beta-Si-6-zAlzOzN8-z composite. Different pre-oxidation treatment resulted in a variation of the oxygen content in the solid solution phase (z = 0.6-1.2). (c) 2006 Springer Science + Business Media, Inc.