| Numéro |
J. Phys. Colloques
Volume 51, Numéro C1, Janvier 1990
Proceeding of the International CongressIntergranular and Interphase Boundaries in materials |
|
|---|---|---|
| Page(s) | C1-551 - C1-556 | |
| DOI | https://doi.org/10.1051/jphyscol:1990186 | |
J. Phys. Colloques 51, C1-551-C1-556 (1990)
DOI: 10.1051/jphyscol:1990186
1 Chemistry and Materials Science Department, Lawrence Livermore National laboratory, Livermore, CA 94550, U.S.A.
2 Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, U.S.A.
DOI: 10.1051/jphyscol:1990186
EFFECT OF Y ON CATION AND ANION GRAIN BOUNDARY DIFFUSION IN CHROMIA
W.E. KING1 et J. H . PARK21 Chemistry and Materials Science Department, Lawrence Livermore National laboratory, Livermore, CA 94550, U.S.A.
2 Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, U.S.A.
Abstract
Cation and anion diffusivities in the lattice and along grain boundaries have been measured on sintered polycrystals of Cr2O3 and Cr2O3-0.09 weight percent Y2O3 at 1100°C and at the oxygen partial pressure corresponding to that of the Cr/Cr2O3 equilibrium at that temperature. Results show the effect of Y is to enhance cation grain boundary diffusion. It was also observed that under the same conditions, anion diffusion is significantly faster than cation diffusion. The results are discussed in terms of their implications for the reactive element effect on high temperature oxidation of chromia forming alloys.