Fracture Mechanics of Y2O3 Ceramics at High Temperatures

Marek Boniecki; Zdzislaw Librant; Władysław Wesołowski; Magdalena Gizowska; Marcin Osuchowski; Krzysztof Perkowski; Irena Witosławska; Adam Witek

doi:10.4028/www.scientific.net/AST.89.88

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HomeAdvances in Science and TechnologyAdvances in Science and Technology Vol. 89Fracture Mechanics of Y2O3 Ceramics at High...

Fracture Mechanics of Y₂O₃ Ceramics at High Temperatures

Abstract:

Fracture toughness K_Ic and four-point bending strength σ_c at high temperature (up to 1500 °C) of Y₂O₃ ceramics of various grain size were measured. The ceramics were prepared by pressureless air sintering and next hot isostatic pressing of high purity (99.99%) Y₂O₃ powder. Relative density of about 99 % was achieved. Photos of microstructures revealed small pores distributed mainly inside grains. For smallest grain size (2 - 9 μm) ceramics K_Ic and σ_c are almost constant from 20 ° to 1200 °C and next they decrease. For biggest grain size (about 44 μm) they increase up to 800 °C and next they keep constant up to 1200 °C. The micrographs analyses of fracture surfaces indicated that transgranular mode of fracture at room temperature changes to almost intergranular at higher temperatures.

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Periodical:

Advances in Science and Technology (Volume 89)

Pages:

88-93

DOI:

https://doi.org/10.4028/www.scientific.net/AST.89.88

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Online since:

October 2014

Authors:

Marek Boniecki, Zdzislaw Librant, Władysław Wesołowski, Magdalena Gizowska, Marcin Osuchowski, Krzysztof Perkowski, Irena Witosławska, Adam Witek

Keywords:

Fracture Surface, Fracture Toughness, Grain Size, Strength, Yttria Ceramics

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