Deformation behaviour of zirconia with a different pore structure

Open School-Conference of NIS Countries Ultrafine Grained and Nanostructured Materials

Sevostyanova, I.N.^1 ; Sablina, Yu T.^1 ; Savchenko, N.L.^1 ; Kulkov, S.N.^1,2

Institute of Strength Physics and Materials Science SB RAS, 3/4 Akademichesky ave., Tomsk

634055, Russia^1

National Research Tomsk State University, 36 Lenin ave., Tomsk

634050, Russia^2

关键词: Average particle size;    Bimodal pore size distribution;    Bimodal size distribution;    Brittle failures;    Deformation behaviour;    Diametral compressions;    Multiple damages;    Zirconia ceramic;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/447/1/012022/pdf
DOI  :  10.1088/1757-899X/447/1/012022

来源: IOP

【 摘 要 】

The structure and mechanical properties of zirconia ceramics obtained by slip casting with unimodal and bimodal size distributions and a wide range of porosity (up to 65%) were studied. Samples sintered using powder ZrO2-3 mol.% Y2O3 with an average particle size of 0.2 μm with an unimodal pore size distribution were obtained by slip casting, followed by removal of the binder. Samples with a bimodal pore size distribution were sintered using spherical ultra-high molecular weight polyethylene particles with an average particle size of 100 μm. Axial and diametral (the Brazilian test) compression tests were performed for the obtained materials. The samples showed a brittle fracture, irrespective of the pore structure in the case of diametral compression tests. In the case of axial compression tests, a typical brittle failure took place in samples with porosity up to 10 vol.% and a "pseudo-plastic" failure occurred in samples with higher porosity. The latter can be ascribed to the movements of the meso-volumes to the pores and the accumulation of multiple damages, which were visually observed during the compression test.