Formation of Micro, Nano and Atomic-Level Structure of CoAlO/Co-Al Cermets Prepared by Mechanical Alloying | Sciact - CRIS-system of Boreskov Institute of Catalysis

Formation of Micro, Nano and Atomic-Level Structure of CoAlO/Co-Al Cermets Prepared by Mechanical Alloying Full article

Journal

Journal of Materials Science and Engineering (A & B)
ISSN: 2161-6213 , E-ISSN: 2161-6221

Output data

Year: 2012, Volume: 2, Number: 2, Pages: 121-136 Pages count : 16

Tags

Co-Al alloy, CoAlO/Co-Al cermet, structure, microstructure.

Authors

Andreev Andrey ¹ , Salanov Aleksey ¹ , Tikhov Serguei ¹ , Cherepanova Svetlana ¹ , Zaikovskii Vladimir ¹ , Usoltsev Vladimir ¹ , Sadykov Vladislav ¹ , Lapina Olga ¹

Affiliations

1	Boreskov Institute of Catalysis SB RAS, 630090, pr. Lavrentieva 5, Novosibirsk, Russian Federation

Micro, nano and atomic scale structure of Co-Al cermet prepared by mechanical alloying of Co-Al powders followed by hydrothermal treatment and calcination in the air were studied by X-Ray diffraction pattern (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-Ray spectroscopy (EDX) and internal field 59Co NMR techniques. The set of physicochemical methods revealed that the cermet metallic part of their particles includes regions comprised of Co and Co-Al alloy with the average Co: Al ratio~ 2. In turn, the oxide matrix is contained the mixture of cobalt aluminates (Co2AlO4 and CoAl2O4) and cobalt oxides (Co3O4, CoO). The interface between these two cermet parts is represented by aluminum oxide Al2O3 shell protecting the metallic core against further oxidation. The presence of metallic cores containing Co and Co-Al alloy increases CoAlO/Co-Al cermets crushing strength up to 700-800 kg/cm2 that greatly exceeds Al2O3/Al cermet crushing resistance (10-100 kg/cm2).

Andreev A. , Salanov A. , Tikhov S. , Cherepanova S. , Zaikovskii V. , Usoltsev V. , Sadykov V. , Lapina O.
Formation of Micro, Nano and Atomic-Level Structure of CoAlO/Co-Al Cermets Prepared by Mechanical Alloying
Journal of Materials Science and Engineering (A & B). 2012. V.2. N2. P.121-136. РИНЦ ANCAN

Submitted:	Nov 26, 2011
Accepted:	Dec 16, 2011
Published print:	Feb 10, 2012

Elibrary:	21044689
Chemical Abstracts:	2012:1319882
Chemical Abstracts (print):	158:366397

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