In situ formation of metal-ceramic microstructures, including metal-ceramic composites, using reduction reactions

Journal Article · Thu Jul 01 04:00:00 EDT 1993 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(93)90385-6· OSTI ID:6463238

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

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

Partial reduction reactions were used to form a metallic phase either around or inside oxide grains in polycrystals in the Fe-Mn-O system. By suitable choice of oxide composition, partial pressure of oxygen, annealing time and temperature, it is possible to control the nucleation and growth of the metallic phase to produce a wide range of metal-ceramic microstructures. These include ceramic grains with a thin layer of metallic phase at their boundaries; ceramic grains with a thick layer of metallic phase at their boundaries--essentially, a metal-ceramic composite; and ceramic grains containing a fine distribution of metal particles--essentially, a ductile phase toughened ceramic. The presence of the metallic phase increases the fracture toughness of all the metal-ceramic microstructures with respect to that of the pure ceramic, with the largest increase observed for the metal-ceramic composite. It is believed that the principles established by studying the Fe-Mn-O system can be used on more practical mixed oxide systems to produce metal-ceramic microstructures, which in some cases are unique, and in particular, if the starting oxide material is in the form of plate- or rod-shaped crystals, to produce metal-ceramics composites in situ.

• DOE Contract Number: FG02-88ER45357
• OSTI ID: 6463238
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 41:7; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360602* -- Other Materials-- Structure & Phase Studies
ANNEALING
CERAMICS
CHALCOGENIDES
CHEMICAL REACTIONS
COMPOSITE MATERIALS
CRYSTALS
DATA
DIAGRAMS
ELEMENTS
EXPERIMENTAL DATA
FRACTURE PROPERTIES
GRAIN GROWTH
HEAT TREATMENTS
INFORMATION
IRON COMPOUNDS
IRON OXIDES
MANGANESE COMPOUNDS
MANGANESE OXIDES
MATERIALS
MECHANICAL PROPERTIES
METALS
MICROSTRUCTURE
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHASE DIAGRAMS
POLYCRYSTALS
REDUCTION
THERMODYNAMICS
TRANSITION ELEMENT COMPOUNDS