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Journal of Advanced Ceramics  2014, Vol. 3 Issue (2): 165-170    doi: 10.1007/s40145-014-0108-y
Research Article     
In-situ synthesis and sintering of mullite glass composites by SPS
Jinyong ZHANGa*,Hai ZHANa,Zhengyi FUa,Richard TODDb
aState Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
bDepartment of Materials, University of Oxford, Oxford, UK
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Abstract  

The main subject of this work is an investigation of the effects of heating rate and current on the crystallisation of amorphous precursors in spark plasma sintering (SPS). For this, dry gel of Al2O3–SiO2 with a molar ratio of 1:1, was synthesized and sintered in-situ by SPS, and also by hot pressing (HP) for comparison. Phase analysis showed that the only crystalline product in both cases was mullite, whose Al2O3 content was lower in the SPS specimens. The microstructures showed a low volume fraction of large mullite fibers in the SPS specimens, whereas a high volume fraction of fine equiaxed grains was present in the HP specimen. The main difference in microstructure between HP and SPS specimens could be explained in terms of the higher heating rate of the SPS specimens. The size of the SPS die also affected the size and aspect ratio of the mullite fibers produced, which might have been due to either the different electrical current required or a difference in specimen temperature profile.



Key wordsspark plasma sintering (SPS)      synthesis      extra-field      mullite     
Received: 24 March 2014      Published: 12 June 2014
Corresponding Authors: Jinyong ZHANG   
Cite this article:

Jinyong ZHANG,Hai ZHAN,Zhengyi FU,Richard TODD. In-situ synthesis and sintering of mullite glass composites by SPS. Journal of Advanced Ceramics, 2014, 3(2): 165-170.

URL:

http://jac.tsinghuajournals.com/10.1007/s40145-014-0108-y     OR     http://jac.tsinghuajournals.com/Y2014/V3/I2/165

Fig. 1 XRD results of products fabricated by SPS and HP.
Fig. 2 SEM pictures of (a) HP and (b) SPS-1227 after acid etching.
Fig. 3 TEM pictures of (a) SPS-860 and (b) SPS-1227.
Fig. 4 SEM pictures of (a) HP and (b) and (c) SPS-1227 specimens after 2 kg indentation.
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