Effect of Y on cation and anion grain boundary diffusion in chromia

Conference · Mon Dec 31 23:00:00 EST 1990

OSTI ID:6399283

King, W E ^[1]; Park, J H ^[2]

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1. Lawrence Livermore National Lab., CA (United States)
2. Argonne National Lab., IL (United States)

Cation and anion diffusivities in the lattice and along grain boundaries have been measured on sintered polycrystals of Cr[sub 2]O[sub 3] and Cr[sub 2]O[sub 3]-0.09 weight percent Y[sub 2]O[sub 3] at 1100 C and at the oxygen partial pressure corresponding to that of the Cr/Cr[sub 2]O[sub 3] 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. Results are discussed in terms of their implications for the reactive element effect on high temperature oxidation of chromia forming alloys.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6399283
• Report Number(s): UCRL-JC-106137; CONF-890977--3; ON: DE93013837
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ANIONS
ATOM TRANSPORT
CATIONS
CHALCOGENIDES
CHARGED PARTICLES
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
CRYSTAL STRUCTURE
CRYSTALS
DIFFUSION
DOPED MATERIALS
GRAIN BOUNDARIES
IONS
MATERIALS
MICROSTRUCTURE
NEUTRAL-PARTICLE TRANSPORT
OXIDES
OXYGEN COMPOUNDS
POLYCRYSTALS
RADIATION TRANSPORT
SINTERED MATERIALS
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES