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Title: Synthesis of an Al{sub 2}O{sub 3}/Al co-continuous composite by reactive melt infiltration

Abstract

The route for the fabrication of an Al{sub 2}O{sub 3}/Al co-continuous composite by reactive melt infiltration was investigated using scanning electron microscopy, energy dispersive X-ray microanalysis and X-ray diffraction analysis. It was found that in the process of molten aluminium infiltration into the SiO{sub 2} preform, the chemical reaction of 3SiO{sub 2} + 4Al {sup {yields}} 2Al{sub 2}O{sub 3} + 3Si occurred at the infiltration front, and generated a transition zone containing a new type of continuous porosity about 100 {mu}m in width. The reaction continued with further infiltration of molten aluminium alloy into this porosity which reacted with the residual SiO{sub 2} until all the SiO{sub 2} was transformed into Al{sub 2}O{sub 3}. A comparison was made between this route and that by direct infiltration of molten aluminium alloy into the open porosity of an Al{sub 2}O{sub 3} preform. As a result of the increased wetting ability of the molten aluminium alloy by the chemical reaction, reactive melt infiltration took place at a higher rate for the SiO{sub 2} preform than that for the direct infiltration of the Al{sub 2}O{sub 3} preform. A fracture surface examination demonstrated a toughening effect provided by the continuous aluminium alloy in the composite.

Authors:
 [1];  [2];  [3]
  1. Department of Physics and Materials Science, City University of Hong Kong, Hong Kong (China). E-mail: Lawrence.Wu@cityu.edu.hk
  2. Department of Physics and Materials Science, City University of Hong Kong, Hong Kong (China)
  3. (China)
Publication Date:
OSTI Identifier:
21003553
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 58; Journal Issue: 5; Other Information: DOI: 10.1016/j.matchar.2006.06.006; PII: S1044-5803(06)00200-2; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM ALLOYS; ALUMINIUM OXIDES; CERAMICS; CHEMICAL PREPARATION; CHEMICAL PROPERTIES; CHEMICAL REACTIONS; FABRICATION; FRACTURES; LIQUID METALS; MICROANALYSIS; POROSITY; SCANNING ELECTRON MICROSCOPY; SILICA; SILICON OXIDES; X RADIATION; X-RAY DIFFRACTION

Citation Formats

Wu, C.M.L., Han, G.W., and Department of High Temperature Materials Research, Central Iron and Steel Research Institute, Beijing 100081. Synthesis of an Al{sub 2}O{sub 3}/Al co-continuous composite by reactive melt infiltration. United States: N. p., 2007. Web. doi:10.1016/j.matchar.2006.06.006.
Wu, C.M.L., Han, G.W., & Department of High Temperature Materials Research, Central Iron and Steel Research Institute, Beijing 100081. Synthesis of an Al{sub 2}O{sub 3}/Al co-continuous composite by reactive melt infiltration. United States. doi:10.1016/j.matchar.2006.06.006.
Wu, C.M.L., Han, G.W., and Department of High Temperature Materials Research, Central Iron and Steel Research Institute, Beijing 100081. Tue . "Synthesis of an Al{sub 2}O{sub 3}/Al co-continuous composite by reactive melt infiltration". United States. doi:10.1016/j.matchar.2006.06.006.
@article{osti_21003553,
title = {Synthesis of an Al{sub 2}O{sub 3}/Al co-continuous composite by reactive melt infiltration},
author = {Wu, C.M.L. and Han, G.W. and Department of High Temperature Materials Research, Central Iron and Steel Research Institute, Beijing 100081},
abstractNote = {The route for the fabrication of an Al{sub 2}O{sub 3}/Al co-continuous composite by reactive melt infiltration was investigated using scanning electron microscopy, energy dispersive X-ray microanalysis and X-ray diffraction analysis. It was found that in the process of molten aluminium infiltration into the SiO{sub 2} preform, the chemical reaction of 3SiO{sub 2} + 4Al {sup {yields}} 2Al{sub 2}O{sub 3} + 3Si occurred at the infiltration front, and generated a transition zone containing a new type of continuous porosity about 100 {mu}m in width. The reaction continued with further infiltration of molten aluminium alloy into this porosity which reacted with the residual SiO{sub 2} until all the SiO{sub 2} was transformed into Al{sub 2}O{sub 3}. A comparison was made between this route and that by direct infiltration of molten aluminium alloy into the open porosity of an Al{sub 2}O{sub 3} preform. As a result of the increased wetting ability of the molten aluminium alloy by the chemical reaction, reactive melt infiltration took place at a higher rate for the SiO{sub 2} preform than that for the direct infiltration of the Al{sub 2}O{sub 3} preform. A fracture surface examination demonstrated a toughening effect provided by the continuous aluminium alloy in the composite.},
doi = {10.1016/j.matchar.2006.06.006},
journal = {Materials Characterization},
number = 5,
volume = 58,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}