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Title: | Fe-Cr/Al2O3 metal-ceramic composites: Nature and size of the metal particles formed during hydrogen reduction |
Authors: | Laurent, Ch Demai, J J Rousset, A Kannan, K R Rao, C N R |
Keywords: | Matrix Nanocomposites Mechanical-Properties Fe-Cr Charge |
Issue Date: | Jan-1994 |
Publisher: | Materials Research Society |
Citation: | Journal Of Materials Research 9(1), 229-235 (1994) |
Abstract: | Fe-Cr/Al2O3 metal-ceramic composites prepared by hydrogen reduction at different temperatures and for different periods have been investigated by a combined use of Mossbauer spectroscopy, x-ray diffraction, transmission electron microscopy, and energy-dispersive x-ray spectroscopy in order to obtain information on the nature of the metallic species formed. Total reduction of Fe3+ does not occur by increasing the reduction time at 1320 K from 1 to 30 h, and the amount of superparamagnetic metallic species is essentially constant (about 10%). Temperatures higher than 1470 K are needed to achieve nearly total reduction of substitutional Fe3+. Interestingly, iron favors the reduction of chromium. The composition of the Fe-Cr particles is strongly dependent on their size, the Cr content being higher in particles smaller than 10 nm. |
Description: | Restricted Access |
URI: | https://libjncir.jncasr.ac.in/xmlui/10572/1243 |
Other Identifiers: | 0884-2914 |
Appears in Collections: | Research Papers (Prof. C.N.R. Rao) |
Files in This Item:
File | Description | Size | Format | |
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sl.no28.1994.J. Mater. Res. 9(1), 229-235.pdf Restricted Access | 737.06 kB | Adobe PDF | View/Open Request a copy |
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