DIFFUSION OF IRON, NICKEL AND COBA INTO HOT-PRESSED TITANIUM CARBIDE

摘要

The diffiusion of Fe, Ni and Co into a hot-pressed TiC body has been studied using the radioactive isotopes of these transition metals. The calculation of the diffusion coefficients was made both by the surface decrease method and by the determination of the con¬centration gradient within the sample. Measurements of the diffusion coefficient were made at 900, 1000 and 1100°C but evidence is presented that D is dependent upon the structure of the sample. It appears that grain boundary diffusion is the predominant type of diffusion occur¬ring. Reproducibility of results, while working with polycrystalline material, is difficult because of the variables present in such a system