Ceramic matrix composites prepared from CoAl powders

S. F. Tikhov, A. S. Andreev, A. N. Salanov, S. V. Cherepanova, O. B. Lapina, V. A. Sadykov, Yu Yu Tanashev, V. A. Bolotov

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Multiscale structure of two CoxAlyOz cermets was examined by a combination of XRD, SEM coupled with EDX, NMR (59Co; 27Al), and textural measurements. A strong CoAlO/CoAl cermet monolith prepared by mechanical alloying of Co and Al powders followed by hydrothermal treatment and calcination in air comprised two parts: the metal core consisting of Co and a Co–Al alloy, and the outer oxide matrix including a mixture of CoxAl3–xO4 spinel and cobalt oxides. The two parts were separated by the alumina interface protecting the metal core against the oxidation. Al2O3/CoAlO/CoAl cermet prepared by mixing the Co–Al mechanically alloyed product and pure aluminum hydroxide with subsequent hydrothermal treatment and calcination in air consisted of three main parts: (i) large cobalt-free porous alumina (ii) surrounded by CoxAl3–xO4 spinel oxides, and (iii) the inner core containing pure Co metal particles covered with the Co–Al alloy. A random distribution of metal particles in the oxide matrix provided an enhanced microwave absorption. A developed porosity ensured a high activity of the catalyst prepared from the porous cermet in the hexane dehydrogenation under microwave heating.

Original languageEnglish
Pages (from-to)10487-10498
Number of pages12
JournalJournal of Materials Science
Volume51
Issue number23
DOIs
Publication statusPublished - 1 Dec 2016

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