Deformation and Fracture of Corundum Ceramics with a Multilevel Pore Structure

M. V. Grigor’ev, A. G. Burlachenko, S. P. Buyakova, S. N. Kul’kov

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Abstract

Abstract: The behavior of Al2O3 ceramics having a 50% volume of pore space under compression is studied. The porous structure includes three types of pores: large porosity with an average size of 120 μm, small porosity with an average size of 2 μm, and extended porous channels (about 150 μm) formed as a result of zonal separation during sintering. It is shown that at a load of ceramics with such a multilevel pore structure, the microdamage accumulates over the entire volume of the sample. It causes decreasing the scale level of fracture from microscopic (in the case of ceramics with unimodal pore structure) to meso- and microscale (for ceramics with a multilevel pore structure). Residual deformation in such material appears at small loads of about 0.3σc due to displacements of blocks and their groups during deformation before the ultimate strength.

Original languageEnglish
Pages (from-to)1803-1807
Number of pages5
JournalTechnical Physics
Volume64
Issue number12
DOIs
Publication statusPublished - 1 Dec 2019

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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