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Near‐Net‐Shape Processing of Metal‐Ceramic Composites by Reactive Metal Penetration
Author(s) -
Fahrenholtz William G.,
Ewsuk Kevin G.,
Ellerby Donald T.,
Loehman Ronald E.
Publication year - 1996
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1996.tb09005.x
Subject(s) - materials science , mullite , composite material , ceramic , metal , penetration (warfare) , shrinkage , penetration depth , volume (thermodynamics) , metallurgy , physics , optics , operations research , quantum mechanics , engineering
Metal‐ceramic composites were made to near‐net shape by reacting phase‐pure mullite and mullite‐glass preforms with molten Al using a reactive metal penetration process. Conversion of the two ceramic preforms to Al 2 O 3 /Al composites was accompanied by a 0.32% volume expansion and a 1.42% volume shrinkage, respectively. Molar volume and density calculations made assuming a net‐shape reaction estimate ∼17 and ∼27 vol% Al to be present in the two composites after reaction. Results from quantitative stereology measurements used to quantify the concentration of metal in the reactively formed composites validate the calculations.