Paper Title:

Sinterbility and Mechanical Properties of Zirconia Nanoparticles Prepared by Hydrothermal Process

Periodical Solid State Phenomena (Volumes 124 - 126)
Main Theme Advances in Nanomaterials and Processing
Edited by Byung Tae Ahn, Hyeongtag Jeon, Bo Young Hur, Kibae Kim and Jong Wan Park
Pages 1293-1296
DOI 10.4028/www.scientific.net/SSP.124-126.1293
Citation Sun Hyo Park et al., 2007, Solid State Phenomena, 124-126, 1293
Online since June 2007
Authors Sun Hyo Park, In Young Ryu, Won Jun Lee, Dae Joon Kim, Jung Suk Han, Myung Hyun Lee
Keywords Fracture Toughness, Hydrothermal Synthesis, Nanoparticle, Zirconia
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A hydrothermal method has been used to produce nanoparticles of 3 mol% yttria-stabilized tetragonal zirconia (3Y-TZP) with high fracture toughness. The effects of reaction temperature and pH on crystallite size and sintered density, and the influence of Nb2O5 addition into 3Y-TZP on toughness have been investigated. The particle size increased with increasing the processing parameters and the influence of temperature was more significant than pH. The density of nanosized 3Y-TZP increased with increasing pH up to 9 and then decreased abruptly with further increase. The density increased slightly with the reaction temperature up to 140°C and then changed little with increasing temperature. The toughness increased in proportional to the Nb2O5 content. After sintering for 1 h at 1270°C, the highest relative density of 98% was obtained from nanoparticles of about 17 nm, prepared at 200°C and pH 9, and the toughness of 3Y-TZP was increased from 2.5 to 8.3 MPam1/2 by addition of 1.2 mol% Nb2O5.