Journal
OPEN CERAMICS
Volume 16, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.oceram.2023.100485
Keywords
Composites; Iron; Alumina; Spark plasma sintering; Mechanical properties
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The aim of this study is to prepare Fe-Al2O3 ceramic-matrix composites with a high Fe content to achieve a high degree of toughening. Fe-Al2O3 powders with different Fe contents were prepared by selective reduction and dense samples were obtained using Spark Plasma Sintering. The results showed that a continuous Fe network dispersed in the alumina matrix contributed to significantly higher toughness compared to samples with dispersed Fe particles.
The aim is to prepare Fe-Al2O3 ceramic-matrix composites with a high Fe content in order to benefit from a high degree of toughening. Fe-Al2O3 powders with different Fe contents (14.2-47.4 vol%) are prepared by selective reduction in H2 of the corresponding amorphous Al2-2xFe2xO3 oxides, themselves prepared by decomposition in air of the mixed oxalates. Dense samples are prepared by Spark Plasma Sintering. The samples are investigated by thermal analysis, scanning electron microscopy and X-ray diffraction. The microhardness, fracture strength and toughness are discussed with respect to the composition and the microstructure, i.e. a dispersion of discrete Fe particles or a continuous Fe network into the alumina matrix. The latter samples are significantly thougher than the former ones (about 14 and 8 MPa m1/2, respectively).
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