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Fracture Mechanics of Y2O3 Ceramics at High Temperatures

Authors :
Boniecki, Marek
Librant, Zdzislaw
Wesołowski, Władysław
Gizowska, Magdalena
Osuchowski, Marcin
Perkowski, Krzysztof
Witosławska, Irena
Witek, Adam
Source :
Advances in Science and Technology; October 2014, Vol. 89 Issue: 1 p88-93, 6p
Publication Year :
2014

Abstract

Fracture toughness K<subscript>Ic</subscript> and four-point bending strength σ<subscript>c</subscript> at high temperature (up to 1500 °C) of Y<subscript>2</subscript>O<subscript>3</subscript> 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%) Y<subscript>2</subscript>O<subscript>3</subscript> 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<subscript>Ic</subscript> and σ<subscript>c</subscript> 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.

Details

Language :
English
ISSN :
16628969
Volume :
89
Issue :
1
Database :
Supplemental Index
Journal :
Advances in Science and Technology
Publication Type :
Periodical
Accession number :
ejs57696367
Full Text :
https://doi.org/10.4028/www.scientific.net/AST.89.88