Oxidation Behaviour of Reaction-bonded Alumina Compacts Using an Al₈₈Si₁₂ Alloy Precursor
Carter, C. B.
The oxidation behaviour of attrition-milled Al88Si12/Al2O3 powder mixtures was investigated for the formation of mullite/Al2O3 composites by the reaction bonded alumina (RBAO) process. Cylindrical powder compacts were heated at 5°C min−1 to temperatures between 450 and 1400°C. Oxidation occurred rapidly between ca. 400 and 750°C. Dense, outer reaction layers which formed at the lower temperatures inhibited complete oxidation and led to fracture of the body during continued heating to higher temperatures (above ca. 850°C) While the incorporation of ZrO2 improved the oxidation of the samples, X-ray analysis indicated that the Si in the alloy reacted with the ZrO2 to form phases which prevented the formation of mullite at the temperatures used in the experiments.
S. H. Yokota et al., "Oxidation Behaviour of Reaction-bonded Alumina Compacts Using an Al₈₈Si₁₂ Alloy Precursor," Journal of Materials Science, Springer Verlag, Jan 1994.
The definitive version is available at http://dx.doi.org/10.1007/BF00414196
Materials Science and Engineering
Keywords and Phrases
Polymer Sciences; Industrial Chemistry/Chemical Engineering; Characterization and Evaluation Materials; Mechanics
Article - Journal
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