Open AccessInfluence of Spark plasma sintering on the tetragonal phase of ZrO 2 ‐NiO nanosized powders synthesised via oxidation of quenched melted Ni 40 ‐Zr 60 alloy
Author(s) -
Messaoudene Redha,
Saidi Djaffar,
BoutarekZaourar Naima,
Drazenovic Béatrice,
Zaid Bachir,
Si Ahmed Abderrahmane
Publication year - 2018
Publication title -
micro and nano letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.25
H-Index - 31
ISSN - 1750-0443
DOI - 10.1049/mnl.2017.0452
Subject(s) - materials science , spark plasma sintering , tetragonal crystal system , non blocking i/o , alloy , microstructure , monoclinic crystal system , ball mill , grain size , metallurgy , phase (matter) , analytical chemistry (journal) , chemical engineering , crystallography , crystal structure , biochemistry , chemistry , organic chemistry , chromatography , engineering , catalysis
Composite ZrO 2 ‐NiO powders synthesised, via the oxidation of Ni 40 ‐Zr 60 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 ZrO 2 (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 ZrO 2 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 ZrO 2 .