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Fabrication of Transparent Y2Hf2O7 Ceramic from Combustion Synthesized Powders

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Author(s): ZOU Xiao-Qing, ZHOU Guo-Hong, YI Hai-Lan, YANG Yan, WANG Shi-Wei

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 26;
Issue: 9;
Start page: 929;
Date: 2011;
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Keywords: combustion synthesis; Y2Hf2O7; transparent ceramic; vacuum sintering

ABSTRACT
Y(NO3)3, HfCl4 and EDTA as raw materials,Y2Hf2O7 nanopowder were successfully prepared by combustion synthesis method. The as―burnt powder were calcined at 1200¡æ and then ball―milled for 15h. The powders were formed into green bodies with a size of 20mm×2.5mm by cold isostatic pressing (CIP, 200MPa). Y2Hf2O7 transparent ceramics were obtained by sintering the green bodies at 1850¡æ in vacuum for 6h. The resultant ceramics showed a transmittance of 50% in the visible spectral region. The sintering behavior of the prepared Y2Hf2O7 powders was investigated. When the sintering temperature was above 1850¡æ, sintering temperature had little effect on the transmittance of the ceramic. Meanwhile the grain size became larger with sintering temperature increasing.

Tango Jona
Tangokurs Rapperswil-Jona

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