Nano-Blast Synthesis and SP Sintering of CeO2-Gd2O3 Nanosize Powder.

Oleg Vasylkiv 1Yoshio Sakka 2Valeriy V. Skorokhod 3

1. ICYS, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
2. National Institute of Material Science (NIMS), Tsukuba, Japan
3. Institute for Problems in Materias Science (IPMS), 3, Krzhizhanivsky Str., Kiev 03680, Ukraine

Abstract

Engineering CeO2-Gd2O3 ceramic nanopowder with precise morphology by engineering of intermediate nano-reactors followed with 'nano-blast' calcination/deagglomeration was applied. Multiple 'nano-blasts' of C3H6N6O6 embedded to engineered nano-reactors broke apart the agglomerates due to the highly energetic impacts of the blast waves. Extremely rapid detonation (10-8 sec/gram) forms gaseous products with a temperature of 2000 to 5000 ºC compressed into a volume equaling the initial volume of each explosive RDX particle. The instantaneous power of each explosion (i.e., the expansion of compressed gases) is 500 MW/gram. The impacts of the blast waves lead to the fragmentation of the surrounding matter. The impulse evolution of a large volume of gaseous products dissipates the heat of the process and limits the temperature increase, thus reducing the possibility of premature local partial sintering among the primary particles. The solid-solubility is enhanced by the extremely high local temperature generated during the 'nano-explosions'. We produced CGO powder with an average primary crystallite size of 11 nm, an aggregate size distribution of 33 ~ 70 nm , with uniform morphology and precise stoichiometry.

Spark plasma sintering study was conducted to receive full dense nanostructured ceramic with uniform grains. The properties of SPS processing as far as ionic conductivity of produced ceramic will be described.

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Presentation: Oral at E-MRS Fall Meeting 2006, Symposium C, by Oleg Vasylkiv
See On-line Journal of E-MRS Fall Meeting 2006

Submitted: 2006-02-03 04:26
Revised:   2009-06-07 00:44
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