| Autor: |
Fahrenholtz, William G., Ellerby, Donald T., Ewsuk, Kevin G., Loehman, Ronald E. |
| Zdroj: |
Journal of the American Ceramic Society; May 2000, Vol. 83 Issue: 5 p1293-1295, 3p |
| Abstrakt: |
Alumina–Al composites with controlled compositions containing 17 to 31 vol% Al were formed by reactive metal penetration (RMP) of molten Al into dense aluminosilicate preforms. A reaction model has been developed to accurately predict composite Al content from the SiO2:Al2O3ratio of the preform. The model was tested and validated by comparing predicted composite compositions to those measured for RMP composites made from preforms of known compositions. Aluminosilicate preforms containing 28.1, 39.0, and 54.1 wt% SiO2were reacted with Al to produce composites with 17, 25, and 31 vol% Al, respectively. These values compare favorably to Al contents of 17.7, 22.7, and 28.6 vol% Al predicted using the reaction model. The differences between predicted and measured values are attributed to the presence of porosity and Si in the composites, as well as impurities in the SiO2glass phase and porosity in the preforms, none of which is specifically accounted for in the reaction model. |
| Databáze: |
Supplemental Index |
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