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Dense, Shaped Ceramic/Metal Composites at lessthan equal to1000°C by the Displacive Compensation of Porosity (DCP) Method
Author(s) -
Rogers Kirk A.,
Kumar Pragati,
Citak Ramazan,
Sandhage Ken H.
Publication year - 1999
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.1151-2916.1999.tb01829.x
Subject(s) - materials science , ceramic , composite material , porosity , sintering , nial , oxide , metal , metallurgy , intermetallic , alloy
The Displacive Compensation of Porosity method for fabricating dense, shaped ceramic/metal composites at modest temperatures is demonstrated. In this process, liquid‐metal/solid‐ceramic displacement reactions are used to generate more ceramic (by volume) than is consumed, so that pores within a ceramic preform can be filled with the new ceramic phase (i.e., densification without sintering). Dense, lightweight MgO/Mg‐Al composites (74–86 vol% oxide) and higher‐melting, co‐continuous MgAl 2 O 4 /Fe‐Ni‐Al‐bearing composites (42–59 vol% oxide) have been produced via the pressureless infiltration and reaction of magnesium‐bearing liquids with porous preforms of Al 2 O 3 and NiAl 2 O 4 +Fe, respectively, at temperatures of 900°−1000°C. The composites are relatively tough and retain the shapes and dimensions (to within a few percent) of the starting preforms.