Premium
High‐Temperature Oxidation of a Cu–Ni Based Cermet: Kinetic and Microstructural Study
Author(s) -
Rioult Fabien,
Pijolat Michèle,
Valdivieso Françoise,
PrinLamaze MarieAgnès
Publication year - 2006
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00898.x
Subject(s) - cermet , thermogravimetry , partial pressure , internal oxidation , oxygen , alloy , nickel , scanning electron microscope , copper , materials science , oxide , oxygen pressure , metallurgy , inorganic chemistry , chemistry , composite material , organic chemistry , ceramic
The oxidation of a cermet composed of nickel ferrite (Ni x Fe 3− x O 4 ), nickel oxide (Ni y Fe 1− y O), and Ni–Cu alloy (Cu z Ni 1− z ) (with x =0.8, y =0.84, and z =0.44) has been studied by thermogravimetry, at 960°C, under controlled oxygen partial pressure. The rate of oxidation increases with the oxygen partial pressure up to 5.1 × 10 3 Pa, then it becomes independent of the oxygen pressure. This is due to the presence of the two copper oxides, CuO and Cu 2 O, above this oxygen pressure. Scanning electron microscopy observation of oxidized samples has shown that the oxidation mechanism involves both external and internal oxidation.