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Title: Porosity and mechanical properties of zirconium ceramics

Has been studied a porous ceramics obtained from ultra-fine powders. Porous ceramic ZrO{sub 2}(MgO), ZrO{sub 2}(Y{sub 2}O{sub 3}) powder was prepared by pressing and subsequent sintering of compacts homologous temperatures ranging from 0.63 to 0.56 during the isothermal holding duration of 1 to 5 hours. The porosity of ceramic samples was from 15 to 80%. The structure of the ceramic materials produced from plasma-sprayed ZrO{sub 2} powder was represented as a system of cell and rod structure elements. Cellular structure formed by stacking hollow powder particles can be easily seen at the images of fracture surfaces of obtained ceramics. There were three types of pores in ceramics: large cellular hollow spaces, small interparticle pores which are not filled with powder particles and the smallest pores in the shells of cells. The cells generally did not have regular shapes. The size of the interior of the cells many times exceeded the thickness of the walls which was a single-layer packing of ZrO{sub 2} grains. A distinctive feature of all deformation diagrams obtained in the experiment was their nonlinearity at low deformations which was described by the parabolic law. It was shown that the observed nonlinear elasticity for low deformation on deformationmore » diagrams is due to mechanical instability of the cellular elements in the ceramic carcass.« less
Authors:
;  [1] ;  [2] ;  [2] ;  [3]
  1. Tomsk State University (Russian Federation)
  2. (Russian Federation)
  3. Institute of Strength Physics and Materials Science RAS (Russian Federation)
Publication Date:
OSTI Identifier:
22496158
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1688; Journal Issue: 1; Conference: NEWOT'2015: 5. international scientific conference on new operational technologies, Tomsk (Russian Federation), 29-30 Sep 2015; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CERAMICS; DEFORMATION; DIAGRAMS; ELASTICITY; FRACTURES; IMAGES; MAGNESIUM OXIDES; NONLINEAR PROBLEMS; PARTICLES; POROSITY; POROUS MATERIALS; POWDERS; PRESSING; SINTERING; THICKNESS; YTTRIUM OXIDES; ZIRCONIUM; ZIRCONIUM OXIDES