| Reaction Processing of Interpenetrating Phase
Al2O3/Al Composite : Synthesis, Microstructure
and Mechanical Properties |
Sujit K. Roy and Samir K. Ghosh
Pages : 219-225
DOI :10.1080/0371750X.2004.11012167 |
| Abstract |
| Dense Al2O3/Al composites containing three-dimensionally interconnected ceramic and metallic phases were fabricated by a displacement reaction between solid silica glass rods and molten aluminium. These composites consist of about 69% Al2O3 and 31% Al by volume. Their mechanical properties, namely, compressive strength, bend strength and microhardness are de-termined by the conventional procedures. The experimentally obtained data are compared with the theoretically derived one-point method. Elastic modulus, as determined by flexure testing, falls outside the Voigt-Reuss bounds. Although the two phases are interconnected in the composites to form an interpenetrating microstructure, the metallic phase is found to govern the modulus. Thermal treatments during fabrication and the interpenetrating microstructure strongly influence both the compressive and flexural strengths and the hardness of the final composite |
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