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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 5    October 2003

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Preparation of transparent yttrium aluminum garnet ceramics by relatively low temperature solid-state reaction
WANG Jie-qiang(王介强)1, YUE Yun-long(岳云龙)1
TAO Wen-hong(陶文宏)1,YU Qing-hua(于庆华)1
TAO Zhen-dong(陶珍东)2, SUN Xu-dong(孙旭

1. School of Materials Science and Engineering,
Ji′nan University, Ji′nan 250022, China;
2. School of Materials Science and Engineering,
Shandong University, Ji′nan 250014, China;
3. School of Materials and Metallurgy,
Northeastern University, Shenyang 110006, China

Abstract:A new preparation method for a highly sinterable Y2O3 powder was developed, using the mixture of the powder with Al2O3 powder, a transparent yttrium aluminum garnet(YAG) ceramic was prepared at relatively low temperature by a solid-state reaction method. Yttrium nitrate was used as a mother salt, and aqueous ammonia was used as a precipitant reagent, the fine and dendritic precursor crystalline was prepared by adding 0.5% ammonium sulfate into the precipitation reaction system. The highly pure and low-agglomerated Y2O3 powders were obtained by calcinating the precursor at 1100℃, the primary particles are spherical and 60nm in diameter. The mixture of Y2O3 and Al2O3 powders was calcinated, and the resulting mixture compact pressed in mold could be sintered to transparency under vacuum at 1700℃. The sintered transparent YAG polycrystalline exhibits a homogeneous microstructure and its transmittance reaches 45% in the visible light region and 70% in the near-infrared wavelength region.

 

Key words: low temperature; yttria; sulfate ions; solid-state reaction; YAG; transparent ceramics

ISSN 1672-7029
CN 43-1423/U

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