Metal-ceramic microstructures in the Fe-Mn-O system -- Morphology control by impurity addition

Conference · Sun Oct 01 04:00:00 EDT 1995

OSTI ID:100544

Subramanian, R; Uestuendag, E; Sass, S L; Dieckmann, R ^[1]

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1. Cornell Univ., Ithaca, NY (United States). Dept. of Materials Science and Engineering

The influence of the addition of impurities and changes in the oxygen partial pressure on the formation of metal-ceramic microstructures by partial reduction of ternary or higher ceramic oxides was experimentally investigated in the model system Fe-Mn-O at constant temperature and total pressure. Electron microscopy studies were performed for microstructural characterization, phase identification and chemical analysis. It was observed that the addition of dopants such as BaO, CaO, MgO, SrO, Al{sub 2}O{sub 3}, Cr{sub 2}O{sub 3} or ZrO{sub 2} to the initial, polycrystalline oxide solid solution (Fe{sub 1{minus}x}Mn{sub x}){sub 1{minus}{Delta}}O strongly influences the location and rate of metal precipitation during reduction. Experimental observations are discussed based on solubility limits and the segregation of dopants.

• OSTI ID: 100544
• Report Number(s): CONF-941144--; ISBN 1-55899-266-9
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
BARIUM OXIDES
CALCIUM OXIDES
CHROMIUM OXIDES
COMPOSITE MATERIALS
DISLOCATIONS
ELECTRON MICROSCOPY
GRAIN BOUNDARIES
IMPURITIES
IN-SITU PROCESSING
IRON OXIDES
MAGNESIUM OXIDES
MANGANESE OXIDES
MICROSTRUCTURE
PHASE DIAGRAMS
PRECIPITATION
REDUCTION
SOLID SOLUTIONS
STRONTIUM OXIDES
ZIRCONIUM OXIDES