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Title: Forming Al{sub 2}O{sub 3}-Al composites with controlled compositions by reactive metal penetration of dense aluminosilicate preforms

Abstract

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 SiO{sub 2}:Al{sub 2}O{sub 3} ratio 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% SiO{sub 2} were 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 SiO{sub 2} glass phase and porosity in the preforms, none of which is specifically accounted for in the reaction model.

Authors:
; ; ;
Publication Date:
Research Org.:
Univ. of New Mexico, Albuquerque, NM (US)
OSTI Identifier:
20075980
Alternate Identifier(s):
OSTI ID: 20075980
Resource Type:
Journal Article
Journal Name:
Journal of the American Ceramic Society
Additional Journal Information:
Journal Volume: 83; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 0002-7820
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; FABRICATION; ALUMINIUM OXIDES; ALUMINIUM; COMPOSITE MATERIALS; LIQUID METALS; IMPREGNATION; CHEMICAL REACTIONS; CONCENTRATION RATIO; PREDICTION EQUATIONS; VALIDATION

Citation Formats

Fahrenholtz, W.G., Ellerby, D.T., Ewsuk, K.G., and Loehman, R.E. Forming Al{sub 2}O{sub 3}-Al composites with controlled compositions by reactive metal penetration of dense aluminosilicate preforms. United States: N. p., 2000. Web.
Fahrenholtz, W.G., Ellerby, D.T., Ewsuk, K.G., & Loehman, R.E. Forming Al{sub 2}O{sub 3}-Al composites with controlled compositions by reactive metal penetration of dense aluminosilicate preforms. United States.
Fahrenholtz, W.G., Ellerby, D.T., Ewsuk, K.G., and Loehman, R.E. Mon . "Forming Al{sub 2}O{sub 3}-Al composites with controlled compositions by reactive metal penetration of dense aluminosilicate preforms". United States.
@article{osti_20075980,
title = {Forming Al{sub 2}O{sub 3}-Al composites with controlled compositions by reactive metal penetration of dense aluminosilicate preforms},
author = {Fahrenholtz, W.G. and Ellerby, D.T. and Ewsuk, K.G. and Loehman, R.E.},
abstractNote = {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 SiO{sub 2}:Al{sub 2}O{sub 3} ratio 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% SiO{sub 2} were 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 SiO{sub 2} glass phase and porosity in the preforms, none of which is specifically accounted for in the reaction model.},
doi = {},
journal = {Journal of the American Ceramic Society},
issn = {0002-7820},
number = 5,
volume = 83,
place = {United States},
year = {2000},
month = {5}
}