Analysis of uniaxial viscosity and activation energy of deformation for 3Y-TZP by bending creep test

被引:1
作者
Liu, Chao [1 ]
Herrmann, Mathias [2 ]
Deng, Yuanbin [1 ]
Kaletsch, Anke [1 ]
Broeckmann, Christoph [1 ]
机构
[1] Rhein Westfal TH Aachen, Inst Mat Applicat Mech Engn IWM, D-52062 Aachen, Germany
[2] Fraunhofer Inst Ceram Technol & Syst IKTS, D-01277 Dresden, Germany
关键词
Uniaxial viscosity; Bending creep test; Activation energy; Grain growth; 3Y-TZP; TETRAGONAL ZIRCONIA; PHASE-TRANSFORMATION; SINTERING KINETICS; BOUNDARY DIFFUSION; POWDER COMPACTS; STRESS; NANOCRYSTALLINE; MICROSTRUCTURE; DENSIFICATION; POLYCRYSTALS;
D O I
10.1016/j.ceramint.2023.04.103
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The uniaxial viscosity is an important material property that has to be determined in order to understand the densification of a material during the sintering process. It depends simultaneously on temperature, relative density and grain size which complicates its determination. To determine its dependence on these three factors, bending creep tests are performed on pre-sintered 3Y-TZP specimens with different relative densities and grain sizes up to the corresponding pre-sintering temperatures. The uniaxial viscosity of 3Y-TZP specimens is calculated after obtaining the deflection rates. It is found that the uniaxial viscosity decreases with temperature according to the Arrhenius equation. In addition, the tetragonal to cubic phase transformation at temperature above 1300 degrees C leads to a decrease of the activation energy. Apart from that, the contribution of densification and grain growth to the increase of the uniaxial viscosity is quantitatively determined. When grain boundary diffusion dominates, the contribution of grain growth is up to 1.8 times that of densification to the uniaxial viscosity. Furthermore, it is found that Rahaman's model best fits the normalized uniaxial viscosity. At the end, an evolution profile of the uniaxial viscosity for polycrystalline materials during the sintering process is proposed to facilitate the analysis of the sintering shrinkage rate.
引用
收藏
页码:22806 / 22815
页数:10
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