Solid state displacement reaction synthesis of interpenetrating-phase Ni-Al/Al[sub 2]O[sub 3] composites

Interpenetrating-phase composites have certain advantages compared to discontinuous-phase composites. Among these are stability against microstructural coarsening and enhanced fracture resistance. However, it is difficult to fabricate IPCs in a controllable manner. Infiltration of porous performs, c...

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Bibliographic Details
Published in:Scripta metallurgica et materialia 1993-12, Vol.29:12
Main Authors: Henager, C.H. Jr, Brimhall, J.L.
Format: Article
Language:English
Subjects:
360201 - Ceramics, Cermets, & Refractories- Preparation & Fabrication
360202 - Ceramics, Cermets, & Refractories- Structure & Phase Studies
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
COMPOSITE MATERIALS
FABRICATION
MATERIALS
MATERIALS SCIENCE
NICKEL ALLOYS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
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Description
Summary:Interpenetrating-phase composites have certain advantages compared to discontinuous-phase composites. Among these are stability against microstructural coarsening and enhanced fracture resistance. However, it is difficult to fabricate IPCs in a controllable manner. Infiltration of porous performs, chemical vapor infiltration, directed metal oxidation, colloidal methods, and analogs to spinodal decomposition are all methods that have been used. Of particular interest are methods, such as the one presented here, that produce IPCs in situ without expensive lay-up processing. For the work presented here, synthesis of two composites, NiAl/Al[sub 2]O[sub 3] and NiAl+Ni[sub 3]Al+[gamma]-Ni/Al[sub 2]O[sub 3], exhibiting an interconnected cellular-phase structure by means of displacement reactions in situ is demonstrated.
ISSN:0956-716X
DOI:10.1016/0956-716X(93)90284-Y