In situ formation of metal-ceramic microstructures in the NiAlO system by partial reduction reactions

E. Üstündag; R. Subramanian; R. Dieckmann; S. L. Sass

doi:10.1016/0956-7151(95)90294-5

In situ formation of metal-ceramic microstructures in the NiAlO system by partial reduction reactions

E. Üstündag^*, R. Subramanian, R. Dieckmann, S. L. Sass

^*Corresponding author for this work

Cornell University

Research output: Contribution to journal › Article › peer-review

44 Citations (Scopus)

Abstract

Metal-ceramic microstructures were obtained by partial reduction of the spinel compound NiAl₂O₄. Electron microscopy studies were performed for microstructural characterization, phase identification and chemical analysis. Depending on the reduction temperature, two different morphologies of nearly pure Ni particles, equiaxed and rod-like, form within a ceramic matrix. The equiaxed Ni particles (0.02-0.5 μm in diameter) are embedded in α-Al₂O₃, while the rod-like Ni particles (∼ 5 μm in length and ∼ 0.1 μm in diameter) are in a metastable "defect spinel" containing much less Ni than NiAl₂O₄. The fracture toughness of the NiAl₂O₃ mixture was significantly improved with respect to that of the original spinel phase.

Original language	English
Pages (from-to)	383-389
Number of pages	7
Journal	Acta Metallurgica et Materialia
Volume	43
Issue number	1
DOIs	https://doi.org/10.1016/0956-7151(95)90294-5
Publication status	Published - Jan 1995
Externally published	Yes

Funding

Acknowledgements--This research was supported by the Office of Naval Research under Grant N00014-92-J-1526. The use of the Electron Microscopy and Materials Preparation Facilities of the Materials Science Center at Cornell University funded by the National Science Foundation under Grant No. DMR-91-21564 is gratefully acknowledged. The early work of J. Hillman, and the assistance of Y. Shapiro, S. Reeves and A. Kleinsmith was greatly appreciated.

Funders	Funder number
Materials Science Center at Cornell University
National Science Foundation
Office of Naval Research	N00014-92-J-1526

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abstract = "Metal-ceramic microstructures were obtained by partial reduction of the spinel compound NiAl2O4. Electron microscopy studies were performed for microstructural characterization, phase identification and chemical analysis. Depending on the reduction temperature, two different morphologies of nearly pure Ni particles, equiaxed and rod-like, form within a ceramic matrix. The equiaxed Ni particles (0.02-0.5 μm in diameter) are embedded in α-Al2O3, while the rod-like Ni particles (∼ 5 μm in length and ∼ 0.1 μm in diameter) are in a metastable {"}defect spinel{"} containing much less Ni than NiAl2O4. The fracture toughness of the NiAl2O3 mixture was significantly improved with respect to that of the original spinel phase.",

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In situ formation of metal-ceramic microstructures in the NiAlO system by partial reduction reactions

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