Process for making isotropic negative thermal expansion ceramics
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United States of America Patent
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Jun 11, 2002
Grant Date -
Oct 18, 2001
app pub date -
Apr 17, 2001
filing date -
Sep 3, 1998
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Abstract
Ceramic monoliths are described which exhibit tunable coefficients of thermal expansion from about -5 to -11.times.10.sup.-6.degree. C..sup.-1 near ambient temperatures. These two-phase ceramics, which are fabricated, for example, by reactive sintering of WO.sub.3 and ZrO.sub.2, consists of a matrix of ZrW.sub.2 O.sub.8 with inclusions of ZrO.sub.2 having diameters less than 10 .mu.m. Additives may increase the density of the monoliths to greater than 98% of the calculated density. Green body densities, pre-sintered particle size distribution, sintering atmosphere, microstructure, and mechanical properties are discussed. These ceramics may be used as substrates for thermally compensating fiber Bragg gratings.
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