Influence of Spark plasma sintering on the tetragonal phase of ZrO^sub 2^-NiO nanosized powders synthesised via oxidation of quenched melted Ni^sub 40^-Zr^sub 60^ alloy

Composite ZrO2-NiO powders synthesised, via the oxidation of Ni40-Zr60 alloy, and ball milled to sizes below 90 nm were spark plasma sintered. The isotherm levels, above the monoclinic–tetragonal (m–t) transition temperature in ZrO2 (1170°C), were in the range 1200 and 1300°C. Microstructures with g...

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Bibliographic Details
Published in:Micro & nano letters 2018-01, Vol.13 (1), p.41
Main Authors: Messaoudene, Redha, Saidi, Djaffar, Boutarek-Zaourar, Naima, Drazenovic, Béatrice, Zaid, Bachir, Si Ahmed, Abderrahmane
Format: Article
Language:English
Subjects:
Diffraction
Diffraction patterns
Isotherms
Nickel oxides
Oxidation
Quenching
Spark plasma sintering
Transition temperature
X-rays
Zirconium dioxide
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Summary:Composite ZrO2-NiO powders synthesised, via the oxidation of Ni40-Zr60 alloy, and ball milled to sizes below 90 nm were spark plasma sintered. The isotherm levels, above the monoclinic–tetragonal (m–t) transition temperature in ZrO2 (1170°C), were in the range 1200 and 1300°C. Microstructures with grain sizes between 100 and 900 nm were achieved. The X-ray diffraction patterns of the sintered samples revealed that the m–t transformation in ZrO2 was preserved. The fraction of tetragonal phase, between 25 and 45%, increases with the isotherm level. Such partial stabilisation of the tetragonal phase is attributed to the presence NiO in ZrO2.
ISSN:1750-0443