Effect of initial particle packing on the sintering of nanostructured transition alumina

被引:60
作者
Azar, M. [1 ]
Palmero, P. [2 ]
Lombardi, M. [2 ]
Garnier, V. [1 ]
Montanaro, L. [2 ]
Fantozzi, G. [1 ]
Chevalier, J. [1 ]
机构
[1] Univ Lyon, INSA Lyon, CNRS, MATEIS,UMR 5510, F-69621 Villeurbanne, France
[2] Politecn Torino, INSTM, UdR PoliTo, LINCE Lab,Dept Mat Sci & Chem Engn, Turin, Italy
关键词
sintering; transition alumina; particle packing; rearrangement; slip casting; cold isostatic pressing;
D O I
10.1016/j.jeurceramsoc.2007.10.003
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 effect of forming method (cold isostatic pressing and slip casting) on particle packing and the consequent effects on densification, phase transformation and microstructural evolution were evaluated during sintering of a transition alumina powder (Nanotek (R), particle size of 47 mn, delta and gamma phases). It is well known that the transformation of transition alumina towards the stable alpha phase has a critical influence on the sintering behaviour. Therefore, correlation between microstructural evolution and shrinkage in compacts was established using dilatometry, Scanning Electron Microscopy and X-Ray Diffraction. By the two mentioned forming methods, green bodies with the same density were processed, in order to investigate only particle packing homogeneity and its effect on phase transition and sintering. For the same initial green density, the samples prepared by slip casting present a better homogeneity of particle packing, due to an optimal dispersion of particles in the slurry. This initial microstructure feature improves the particles rearrangement during the transition to alpha-alumina and hence enhances the transformation to the thermodynamic stable alpha-phase and the densification step. (c) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1121 / 1128
页数:8
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