Spark plasma sintering as a reactive sintering tool for the preparation of surface-tailored Fe–FeAl2O4–Al2O3 nanocomposites

In situ nanostructured ceramic matrix composite coating prepared by reactive plasma spraying micro-sized Al–Fe2O3 composite powders

“…It is well known that the non-equilibrium plasma spraying process is characterized by high temperatures (∼10,000 K), high velocity (about 200 m s −1 ) and extremely high cooling rate (about 10 6 -10 8 K s −1 ) [6,14,22]. Therefore, the reaction products (FeAl 2 O 4 , Al 2 O 3 and Fe), which were also reported in other non-equilibrium processing of Al-Fe 2 O 3 thermite system [25][26][27][28], were different from that of the equilibrium reaction condition (Al 2 O 3 and Fe).…”

“…It is well known that FeAl 2 O 4 and Al 2 O 3 ceramic phases are hard but brittle, while Fe metallic phase is tough and ductile. Inclusion of metallic phase Fe in FeAl 2 O 4 ceramic matrix may, therefore, improve the toughness of the ceramic coating effectively [25][26][27][28]. TEM micrographs and the corresponding selected area diffraction (SAD) patterns of the CMC coating are shown in Fig.…”

Hardness and friction behavior of bulk CoAl2O4 and Co–Al2O3 composite layers formed during Spark Plasma Sintering of CoAl2O4 powders

“…The preparation of metalAl 2 O 3 composites usually involves firstly the synthesis of a metal-Al 2 O 3 composite powder and then its consolidation by hot-pressing or Spark Plasma Sintering (SPS). However, it was shown that materials with a Fe-Al 2 O 3 or Fe/Cr-Al 2 O 3 composite layer at the surface could be directly prepared by SPS of a powder of a reactive oxide solid solution (a-Al 1.86 Fe 0.14 O 3 or a-Al 2À2x (Fe 0.8 Cr 0.2 ) 2x O 3 , respectively) [5,8,9]. The core of the material is made up of the spinel FeAl 2 O 4 and Al 2 O 3 (and the surface may contain FeAl 2 O 4 too depending on the experimental conditions).…”

Fabrication of Fe/Al2O3 composite foam via combination of combustion synthesis and spark plasma sintering techniques

“…Recently, fabrication of dense Fe/Al 2 O 3 composite via a newly developed method that is called spark plasma sintering has been investigated [11].…”

“…Gurt Santanach et al reduced Al 1.86 Fe 0.14 O 3 solid solution powders in H 2 atmosphere and the products were subsequently sintered by SPS apparatus [11].…”