The Influence of Zirconia Powder Dispersion Technique on Microstructure and Properties of Al2O3 – ZrO2 Ceramic

Sergey Veselov; N.Yu. Cherkasova; R.S. Timarevskiy

doi:10.4028/www.scientific.net/AMM.682.109

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 682The Influence of Zirconia Powder Dispersion...

The Influence of Zirconia Powder Dispersion Technique on Microstructure and Properties of Al₂O₃ – ZrO₂ Ceramic

Abstract:

The results of microstructure and mechanical properties investigation for alumina and zirconia toughened alumina (ZTA) with 20 wt. % 3Y-ZrO₂ is presented. It was stated that the technique of preliminary treatment for zirconia suspension makes significant influence on sintered specimen microstructure. Introduction of the alloying additive treated with ball milling reduces Al₂O₃ grain size in ceramic from 2-5 μm to 0.2-1 μm. The reduction of grain size increases the bending strength of ceramic material from 270 MPa up to 350 MPa. However fracture toughness of alumina and ZTA is 3.4 and 2.5 MPa·m^1/2, respectively. It was shown that the low level of mechanical properties is related to the occurrence of major defects in the form of granule boundaries preserved at the forming stage.

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Periodical:

Applied Mechanics and Materials (Volume 682)

Pages:

109-112

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.682.109

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Online since:

October 2014

Authors:

Sergey Veselov, N.Yu. Cherkasova, R.S. Timarevskiy

Keywords:

Alumina, Dense Ceramic, Grain Growth Inhibitor, Zirconia Toughened Alumina, ZTA

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