Compressive creep of polycrystalline ZrSiO{sub 4}.

Journal Article · Wed Aug 01 04:00:00 EDT 2001 · J. Eur. Ceram. Soc.

DOI:https://doi.org/10.1016/S0955-2219(00)00316-2· OSTI ID:943025

Goretta, K C; Cruse, T A; Koritala, R E; Routbort, J L; Melendez-Martinez, J J; de Arellano-Lopez, A R

Polycrystalline ZrSiO{sub 4} ceramics were prepared from commercial powder. Silicate-based glass phase was observed at multiple-grain junctions. compressive creep tests were conducted in Ar at 1197-1400{sup o}C. For stresses of {approx}1-120 MPa, steady-state creep occurred by diffusional flow. For stresses of >3 MPa, the steady-state strain rate {dot {var_epsilon}} could be expressed as {dot {var_epsilon}} = A{sigma}{sup 1.1{+-}0.1}exp - [(470 {+-} 40 kJ/mol)/RT], where A is a constant, {sigma} the steady-state stress, R the gas constant, and T the absolute temperature. At 1400{sup o}C and 1 MPa, an increase in the value of n was observed. Electron microscopy revealed no deformation-induced change in the microstructures of any of the specimens, which is consistent with creep by diffusion-controlled grain-boundary sliding. Comparison with literature data indicated that volume diffusion of oxygen controlled the creep rate.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: USDOE; DOD; FOR
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 943025
• Report Number(s): ANL/ET/JA-36828
• Journal Information: J. Eur. Ceram. Soc., Journal Name: J. Eur. Ceram. Soc. Journal Issue: 8 ; Aug. 2001 Vol. 21; ISSN 0955-2219; ISSN JECSER
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

61 RADIATION PROTECTION AND DOSIMETRY
CERAMICS
CREEP
DIFFUSION
ELECTRON MICROSCOPY
GLASS
GRAIN BOUNDARIES
MAXIMUM PERMISSIBLE ACTIVITY
OXYGEN
POLYCRYSTALS
SILICON OXIDES
STRAIN RATE
STRESSES
VOLUME
ZIRCONIUM OXIDES