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Elaboration and Mechanical Characterization of Al2O3-ZrO2-YAG Ultrafine Composites

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Abstract:

Al2O3-YAG-ZrO2 composites have been produced by surface modification of a commercial nano-crystalline alumina powder with inorganic precursors of the desired second phases. The doped powders were calcined at various temperatures and for different times: as a function of the thermal treatment, zirconia directly crystallized on the alumina surface, while YAG phase was yielded by solid state reaction among an amorphous yttrium-rich precursor and alumina powder. Several compositions, with increasing second phases volume fractions, were investigated, precisely, Alumina-5vol.%YAG-5vol.%ZrO2, Alumina-20vol.%YAG-20vol.%ZrO2 and Alumina- 33vol.%YAG-33vol.%ZrO. Slip cast bodies were produced by aqueous suspensions of calcined and well-dispersed powders; free-sintering performed at 1500°C for 3 h allowed to reach full densification. The role of the second phases amount on the microstructural features and on some mechanical data preliminary evaluated was established.

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Periodical:

Advances in Science and Technology (Volume 62)

Pages:

76-81

DOI:

https://doi.org/10.4028/www.scientific.net/AST.62.76

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Online since:

October 2010

Authors:

Paola Palmero, Valentina Naglieri, Giulia Spina, Laura Montanaro

Keywords:

Al2O3-YAG-ZrO2 Nanocomposite, Microstructure, Sintering, Slip Casting

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© 2010 Trans Tech Publications Ltd. All Rights Reserved

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DOI: 10.1016/s0142-9612(01)00206-x

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