Process for making isotropic negative thermal expansion ceramics

Ceramic monoliths are described which exhibit tunable coefficients of thermal expansion from about -5 to -11x10-6° C.-1 near ambient temperatures. These two-phase ceramics, which are fabricated, for example, by reactive sintering of WO3 and ZrO2, consists of a matrix of ZrW2O8 with inclusions of ZrO...

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Bibliographic Details
Main Authors FLEMING DEBRA ANNE, KOWACH GLEN ROBERT, LEMAIRE PAUL JOSEPH, JOHNSON DAVID WILFRED
Format Patent
LanguageEnglish
Published 11.06.2002
Edition7
Subjects
ARTIFICIAL STONE
CEMENTS
CERAMICS
CHEMISTRY
COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS
CONCRETE
LIME, MAGNESIA
METALLURGY
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
REFRACTORIES
SLAG
TREATMENT OF NATURAL STONE
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Summary:Ceramic monoliths are described which exhibit tunable coefficients of thermal expansion from about -5 to -11x10-6° C.-1 near ambient temperatures. These two-phase ceramics, which are fabricated, for example, by reactive sintering of WO3 and ZrO2, consists of a matrix of ZrW2O8 with inclusions of ZrO2 having diameters less than 10 mum. 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.
Bibliography:Application Number: US20010835570