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Metal-Ceramic Microstructures in the Fe-Mn-O System – Morphology Control by Impurity Addition

Published online by Cambridge University Press:  15 February 2011

R. Subramanian ,
E. Üstündağ ,
S.L. Sass  and
R. Dieckmann
R. Subramanian
Affiliation:
Department of Materials Science and EngineeringCornell University, Ithaca, NY 14853–1501
E. Üstündağ
Affiliation:
Department of Materials Science and EngineeringCornell University, Ithaca, NY 14853–1501
S.L. Sass
Affiliation:
Department of Materials Science and EngineeringCornell University, Ithaca, NY 14853–1501
R. Dieckmann
Affiliation:
Department of Materials Science and EngineeringCornell University, Ithaca, NY 14853–1501
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Abstract

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-C 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, Al2O3, Cr2 O3 or ZrO2 to the initial, polycrystalline oxide solid solution (Fel−xMnx)1−ΔO strongly influences the location and rate of metal precipitation during reduction. Experimental observations are discussed based on solubility limits and the segregation of dopants.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 365: Symposium M – Ceramic Matrix Composites–Advanced High-Temperature Structural Materials , 1994 , 95
Copyright
Copyright © Materials Research Society 1995

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