A. Kaiser et al., HEAT-TREATMENT OF ULTRAFINE SIC POWDERS TO REDUCE OXIDATION SENSITIVITY AND GRAIN-GROWTH, Nanostructured materials, 4(7), 1994, pp. 795-802
Ultrafine SiC powders of 20 nm were synthesized by a CO2 laser induced
reaction between silane and acetylene followed by heat treatment at d
ifferent temperatures and in different atmospheres. These powders were
examined by TGA, IR-spectroscopy, XRD and also densified by HIP. Resu
lts of different oxidation behavior of the powders are presented. Dens
ification of the different heat treated powders lead to different grai
n sizes in the dense body. Heat treatment of ultrafine SiC in nitrogen
improves oxidation resistance of the powders and reduces grain growth
during densification significantly.