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Metal-Ceramic Composites: A Study Of Small Metal Particles (Divided Metals)

Subbanna, GN and Rao, CNR (1986) Metal-Ceramic Composites: A Study Of Small Metal Particles (Divided Metals). In: Materials Research Bulletin, 21 (12). pp. 1465-1471.

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Abstract

Metal particles in $Pt-Al_2O_3$ and $Ni-Al_2O_3$ composites prepared by the reduction of the xerogels have been investigated by high resolution electron microscopy and x-ray diffraction. The alumina phase is essentially amorphous while the metal particles are crystalline. The average size of the metal particles increases with the metal content in the composites. Pt atoms exhibit a greater tendency to form metal clusters than the Ni atoms. At low metal concentrations ($\leq$0.25 wt%), the number of atoms in the metal particles is in the range 100–400. Lattice resolution of the metal particles has been observed in HREM images. The cubic phase of $ZrO_2$ is stabilized in $Ni-ZrO_2$ composites, the stability increasing with the Ni content.

Item Type: Journal Article
Additional Information: Copyright to this article belongs to Elsevier Science
Keywords: Metal-Ceramic;Composites;Metal Particles;Divided Metals
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 04 Jul 2008
Last Modified: 19 Sep 2010 04:46
URI: http://eprints.iisc.ernet.in/id/eprint/14795

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