Process for making isotropic negative thermal expansion ceramics

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...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: FLEMING DEBRA ANNE, KOWACH GLEN ROBERT, LEMAIRE PAUL JOSEPH, JOHNSON DAVID WILFRED
Format: Patent
Sprache:eng
Schlagworte:
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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Beschreibung
Zusammenfassung: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.