Pressure sintering and creep deformation: a joint modeling approach. Final report
Goal was to understand the mechanisms and microstructure affecting hot-pressing and creep processes. CoO was hot-pressed to different porosity levels and densification maps drawn. Creep experiments were carried out on pure CoO. Dislocation structure of deformed CoO was studied. Grain growth rates in CoO changes from a square dependence with time to a cubic dependence as porosity drops below 2 to 3%. Pores tend to remain on grain boundaries during both final and intermediate-stage densification. A wide variety of ceramics were examined for segregation of impurities: NiO-MgO, NiO-Cr/sub 2/O/sub 3/, NiO-TiO/sub 2/, Ni-Al/sub 2/O/sub 3/. Precipitation processes are being studied in NiO-Cr/sub 2/O/sub 3/ and in magnesium aluminate spinel.
- Research Organization:
- Lehigh Univ., Bethlehem, PA (USA)
- DOE Contract Number:
- AC02-76ER12408
- OSTI ID:
- 6540513
- Report Number(s):
- DOE/ER/12408-8; ON: DE83006516
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CERAMICS
CHALCOGENIDES
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
COBALT COMPOUNDS
COBALT OXIDES
CREEP
DEFORMATION
FABRICATION
GRAIN GROWTH
HARDENING
HOT PRESSING
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MATERIALS WORKING
MECHANICAL PROPERTIES
MINERALS
NICKEL COMPOUNDS
NICKEL OXIDES
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
POROSITY
PRECIPITATION HARDENING
PRESSING
RESEARCH PROGRAMS
SEGREGATION
SPINELS
TRANSITION ELEMENT COMPOUNDS